In line 1, we added a tunnel device, and called it tunX. Furthermore we told it to use the GRE protocol (mode gre), that the remote address is 207. The ability to mark an interface as down when the remote end of the link is not available is used in order to remove any routes (specifically static routes) in the routing table that use that interface as the outbound interface. Iptables is the userspace module, the bit that you, the user, interact with at the command line to enter firewall rules into predefined tables. device # show interface tunnel 10 Tunnel10 is up, line protocol is up Hardware is Tunnel Tunnel source 1. tunnel are up. 1 Tunnel protocol/transport GRE. 08 Protocol-reject Announces an unknown protocol 09 Echo-request A type of hello message to check if the other end is alive 04 Configure-reject Announces that some options are not recognized 05 Terminate-request Requests to shut down the line 06 Terminate-ack Accepts the shut down request 03 Configure-nak Announces that some options are not. I'm currently with TPG in Melb on ADSL2, sync at 13-14 Meg. The useradd administrative command adds a user account to the system and creates a home directory for that particular user, if so specified. The ACL can be much narrower in a secure GRE tunnel, because you again have two peering interfaces. More important are the two GRE interfaces – Both with a tunnel source IP of 192. In such a case, a network administrator can manually bring the interface down in order to remove any routes (specifically static routes ) in the routing. Both sides can ping the respective tunnel configured destinations however on the 5510 side, the line protocol is down. 122 15:36, 8. 10 Tunnel destination is 1. I need to check with the client if the remote location logs could be shared. GRE tunnels are designed to be completely stateless. You can configure a GRE Generic Routing Encapsulation. Due to many limitation on ASA (IPsec profiles, DVTI, GRE tunnel) the new protocol has totally different configuration steps on IOS and ASA. A consequence of this is that the local tunnel endpoint router does not have the ability to bring the line protocol of the GRE Tunnel interface down if the remote end of the tunnel is unreachable. ESP is IP Protocol 50, so is not based TCP or UDP protocols. All fu(ket up packets are GRE protocol + tcp PPTP port 1723. PPTP (Point-to-Point Tunneling Protocol)¶ Not to be confused with a PPTP VPN, this type of PPTP interface is meant to connect to an ISP and authenticate, much the same as PPPoE works. x] local [y. Generic Routing Encapsulation (GRE) is a protocol for encapsulation of an arbitrary network layer protocol over another arbitrary network layer protocol. More struct gre_sn_t. View Configure, Verify, and Troubleshoot GRE Tunnel Connectivity. L2TP is considered to be a more secure option than PPTP, as the IPSec protocol which holds more secure encryption algorithms, is utilized in conjunction with it. It's not just an EIGRP down or holding expired state, the line protocol on the tunnel goes down. PPTP VPNs need TCP and UDP port 1723 open and IP port 47 must pass the General Routing Encapsulation (GRE) protocol. The ability to mark an interface as down when the remote end of the link is not available is used in order to remove any routes (specifically static routes) in the routing table that use that interface as the outbound interface. GRE does not include strong security to protect its payload. DMVPN prevents the need for pre-configured (static) IPsec (Internet Protocol Security) peers in crypto-map configurations and ISAKMP (Internet Security Association and Key Management Protocol) peer statements. GRE (Generic Routing Encapsulation) is a layer 3 (L3) tunneling protocol, which was standardized by the IETF. The tunnel communicates fine, it sees an EIGRP neighbor on both sides and the routes are sent across just fine however the tunnel is in a state of constant bouncing. Something seems to be significantly slowing down the traffic. The two endpoints are identified by the tunnel source and tunnel destination addresses at each endpoint. Part 1: Find and Correct All Network Errors. Granted, these are point-to-point links. Create Bridge and Add EOIP Tunnel and. Due to many limitation on ASA (IPsec profiles, DVTI, GRE tunnel) the new protocol has totally different configuration steps on IOS and ASA. sh int t101 shows output drops. GRE, or Generic Routing Encapsulation, is a technology developed by Cisco that creates a logical point-to-point link over already accessible networks. CHENYI-R3(config-if)#do sh int tun 3 Tunnel3 is up, line protocol is up Hardware is Tunnel Internet address is 1. Before a GRE tunnel is implemented, IP connectivity must already be in effect between the IP addresses of the physical interfaces on opposite ends of the potential GRE tunnel. but as we give Tunnel-IP in L3 GRE, they should be in same network like a point-to-point connection. Here is the configuration: interface Loopback0 ip address 10. The remote end of the tunnel should have the address of 10. but doest'n t ping i have added the keepalive on both side but the result are same and shows the line protocol down. Reset/down – This is usually a transient state when the tunnel is reset by software. ip tcp path-mtu-discovery B. Description: Tunnel Interface. The Point-to-Point Tunneling Protocol (PPTP), developed by Microsoft in conjunction with other technology companies, is the most widely supported VPN method among Windows clients, and it is the only VPN protocol built into Windows 9x and NT operating systems. Each router r1 through r5 will physically connect to a common FDDI ring. Now as luck would have it I stumbled across a bug with tunnel interfaces miscalculating the IP mtu after the router is rebooted. 3 (Serial2/0/0), destination 0. - [Instructor] Generic Routing Encapsulation or GRE … is a tunneling protocol … that was developed years ago by Cisco Systems … and it can encapsulate a variety of network protocols … inside virtual point-to-point links … over an internet protocol network. YES manual up down. Generic Routing Encapsulation (GRE) is a tunneling protocol that can encapsulate multiple network layer protocols into virtual point-to-point tunnels over an IP network. conf and change the content to the following (replace strongpassword with a password of your choice and %HUB_GRE_IP% with the Hub node GRE IP address): Add the line neighbor %HUB_GRE_IP% remote-as 65000 for each Hub host you have in your NBMA cloud. When the source address of primary tunnel interface on the Hub router is unreachable (data-link between Hub and PE11 is down), the tracking object discovers that the Hub is not reachable over Tunnel 10. Bottom line, for any VPN that is NOT encapsulated inside UDP. View Configure, Verify, and Troubleshoot GRE Tunnel Connectivity. 1/24 Encapsulation is TUNNEL, loopback not set Tunnel source 100. lines, a transition phase is required, one of which is the GRE tunneling method. 255 Source Y. GRE is not supported. GRE does not include strong security to protect its payload. We moved the tunnel to an IOS router and that wasn’t affected. The Cisco ASA is at our Head Office sitting behind our ISP's managed router. Loopback0 unassigned YES unset up up. com ip name-server 4. Line Protocol Down Locally on the Router. Currently I'm running. Cisco VPN :: Creating GRE Tunnel Over ADSL Between ASA 5510 And 2901 Router? Jul 6, 2011. Responsible as first point of contact on post-facto, emergency and normal changes. As it is a logical interface it will never go down. MVRP= Multiple VLAN Registration Protocol (MVRP) formerly known as GARP VLAN Registration Protocol (GVRP) is a standards-based Layer 2 network protocol, for automatic configuration of VLAN information on switches. Both the physical status and protocol status of the source tunnel interface must be up. We achieved Phase 1 ISAKMP but still Phase II IPSEC still down. This could totally be a problem related to the fact that the PPTP protocol was not established from a clean state when the load balancing PCC config was raedy, but rather - the tunnel was established and I did all the config over this tunnel. 2/24 MTU 1514 bytes, BW 9 Kbit, DLY 500000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation TUNNEL, loopback not set Keepalive not set Tunnel source 61. In L2 or L3 GRE, source and destination interface need not to be in same network. when i do a sh crypto isakmp sa the session is status active, there is a valid route available to the remote end, but tunnel interface shows line protocol down. Tunnel 1 is up line protocol is down Description: Tunnel Interface Internet address is X. PPTP VPNs need TCP and UDP port 1723 open and IP port 47 must pass the General Routing Encapsulation (GRE) protocol. However, in the current implementation of GRE tunnels, a configured tunnel does not have the ability to bring down the line protocol of either tunnel endpoint, if the far end is unreachable. GRE tunnel states: up/up: tunnel is fully functional [admin] down/down: the interface is administratively shut down; up/down: tunnel is administratively up but line protocol is down; reset/down: transient state, reset by software (e. Select Custom settings > One VPN tunnel per Gateway pair. "The PPTP GRE packet format is non standard, including an additional acknowledgement field replacing the typical routing field in the GRE header. If you have a GRE tunnel configured through the cellular network be sure to route the end point of the GRE tunnel through the cellular interface, otherwise the tunnel will be down because the router detects recursive routing. Thanks for contributing an answer to Network Engineering Stack Exchange! Please be sure to answer the question. You can get your self down easily. In the figure above: the link from the client to. In the drop down menu, select GRE on IPsec. Hi there In my home lab I´ve setup a GRE-tunnel between two routers. GRE Tunnel Interface States and What Impacts Them - Cisco. Below you can find scenario I use today:. In such a case, a network administrator can manually bring the interface down in order to remove any routes (specifically static routes ) in the routing. Notice the bolded lines in the second tunnel output. GRE tunnel not working. IP/GRE Tunneling via OSPFv2 Peering. در تونل GRE در صورتی که یکی از طرفین ارتباط تونل قطع شود، طرف مقابل قادر به تشخیص قطعی تونل و down کردن line protocol نیست و لذا ترافیک ها روی مسیر تونل ارسال می شود اما ترافیک تونل هیچگاه به مقصد نمی رسد. If there is a way to reach the far end tunnel endpoint, and the tunnel line protocol is not down due to other reasons, the packet arrives on Router B. 1 Tunnel protocol/transport GRE. It can carry almost any layer 3 protocol. GRE encapsulation uses a protocol-type field in the GRE header to support the encapsulation of any OSI layer 3 protocol. When I do a show interface, it shows tunnel up, but line protocol down. Add a static route like this to r1's configuration: ip route 150. com For mGRE tunnel interfaces, since there is no fixed tunnel destination, some of the previous checks for P2P tunnels are not applicable. Пробовал: 1. It works fine until I apply the protection of the tunnel-interface. A major benefit associated with IPSec virtual tunnel. Tunnel is up, line protocol is down Hi, I have two cisco routers with tunnels between them. Bottom line, for any VPN that is NOT encapsulated inside UDP. A console interface with a command line shell that allows users to execute text input as commands and convert these commands to appropriate functions. Hi there In my home lab I´ve setup a GRE-tunnel between two routers. RE: GRE Tunnel: Line Protocol Down? BuckWeet (IS/IT--Management) 14 Nov 08 21:40 Its because when you bring up the tunnel the static routes that you have for the tunnel interfaces kick in. GRE allows routers to act as if they have a virtual point-to-point connection to each other. #3 NHRP registration with a Cisco router does not work gre-mygre Type: static Protocol the CHILD_SA for dynamic GRE tunnel doesnt get completed on hub and. The route to the tunnel destination is now learned via the tunnel itself, this is a recursive GRE route. This usually happens when the tunnel is misconfigured with a Next Hop Server (NHS) that is it's own IP address. Un tunel GRE permite conectar dos extremos que tienen conectividad y por tanto routing, haciendo que cuando los paquetes atraviesen el tunel parezca que se trata de un único salto, pero en. If the transport protocol is unknown or can not be analyzed because it is encrypted (e. Reset/down – This is usually a transient state when the tunnel is reset by software. The Cisco ASA is at our Head Office sitting behind our ISP's managed router. 经了解,该GRE隧道源接口为1号槽位板, 于是将Tunnel接口修改为Tunnel1/0/0 接口名称后GRE隧道UP. tunnel are up. This 4 bytes is the additional GRE header. show ip interface brief | include Tunnel - This command can be used to determine is up or down. VPN tunnels allow geographically separate private local area networks to be connected to each other across public wide area networks. A consequence of this is that the local tunnel end-point router does not have the ability to bring the line protocol of the GRE Tunnel interface down if the remote end of the tunnel is unreachable. RMU VLabNet 8-Tunnel (GRE) - Virtual Laboratory Information Security Exercises. Re: Tunnel10 is up, line protocol is down still receiving routes? Steven Davidson Oct 15, 2017 11:44 AM ( in response to Doug Kenline ) A tunnel interface will be up/up when it has a valid source interface, a protocol address, and a route to the destination. This means that each tunnel endpoint does not keep any information about the state or availability of the remote tunnel endpoint. In such a case, a network administrator can manually bring the interface down in order to remove any routes (specifically static routes ) in the routing. /30) so that we don't have to specific any routing protocol for routing between them. Since it can encapsulate all kinds of IP traffic, GRE can be used to transport multicast traffic over networks that have no multicast support. Destination 10. Tunnel mode will encrypt the whole IP packet (header + payload) and use a new IP header. Remote Access VPN (IPsec) - IOS - isakmp/ipsec profiles November 23, 2014 The last requirement from my previous post is controlling what kind of traffic a VPN user can send over the tunnel. when i do a sh crypto isakmp sa the session is status active, there is a valid route available to the remote end, but tunnel interface shows line protocol down. We take purchase orders and can provide special school, government and corporate pricing. Please note that Ubuntu Server was used as the basis for this article. 1/30 MTU 17916 bytes, BW 100 Kbit/sec, DLY 50000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation TUNNEL, loopback not set Keepalive set (5 sec), retries 4 Tunnel source 2. Network-Layer Protocol Phase (PPP IPCP Opening Phase) How Long Does a Tunnel Remain Idle Before Being Torn Down? Idle. Tunnel0 is up, line protocol is up. In any case, in the current execution of GRE shafts, an arranged shaft does not can cut down the line convention of either passage endpoint, if the far end is inaccessible. Re: tunnel up line protocol down « Reply #8 on: September 22, 2011, 12:04:36 PM » Yeah not all IOS image feature sets support the 6in4 tunneling needed to use a HE. Generic Routing Encapsulation (GRE) is a tunneling protocol that encapsulates network layer protocols inside virtual point-to-point links over an Internet Protocol network. Overview of Protocol: PPTP (Point to Point Tunneling Protocol) A change password request can be sent by the attacker, spoofing as the VPN server, tricking the client's system into presenting a change password dialog box and sending this information when entered and submitted by the user, to the attacker's machine. y] ttl 255 ip link set gre1 up ip addr add [z. 1 YES TFTP up up With ISAKMP DPD/keepalives configured, following a WAN failure, the line protocol is shown as down: Interface IP-Address OK? Method Status Protocol Tunnel1 10. I am not sure if it is with the GRE or the IPSec tunnel. By its name (point-to-point) you can guess that there are only two devices connected to this kind of network segment. When the source address of primary tunnel interface on the Hub router is unreachable (data-link between Hub and PE11 is down), the tracking object discovers that the Hub is not reachable over Tunnel 10. Click here to download GNS3 files for this lab GRE is one of the many possible tunneling mechanisms that use IP as a transport protocol. 2 Tunnel protocol/transport GRE/IP, key disabled keepalive disabled. The main drawback of GRE protocol is the lack of built-in security. If you select both IPsec and GRE encapsulations, two TLOCs are created for the tunnel interface that have the same IP addresses and colors, but that differ by their encapsulation. You can't have a destination to a GRE tunnel that hasn't been established yet. Generic Routing Encapsulation (GRE) is a tunneling protocol that encapsulates network layer protocols inside virtual point-to-point links over an Internet Protocol network. tunnel mode gre ip E. GRE Tunnel Verification. If the transport protocol is unknown or can not be analyzed because it is encrypted (e. A The GRE tunnel source and destination addresses are specified within the from MATHEMATIC ALGEBRA 3 at Three Rivers High School. Products (1). GRE is an IP encapsulation protocol that is used to transport packets over a network. Point to Point Tunneling Protocol (PPTP) PPTP specification is described in network working group RFC 2637 [10]. We also call this encapsulation. There was also a question about GRE tunnel with the options of it support multicast, broadcast traffic or only broadcast and some other options that we needed to choose 2 correct ones. In Cisco IOS Software Releases 15. In ASCII, this is a space. The loopback route (9. Huawei AR1200 Series Enterprise Routers Configuration Guide - VPN 1 GRE Configuration protocol is used, the protocol must be configured on the tunnel interface and the GE interface connected to the PC. 255 Source Y. Create Bridge and Add EOIP Tunnel and LAN Port to the Bridge. Before a GRE tunnel is implemented, IP connectivity must already be in effect between the IP addresses of the physical interfaces on opposite ends of the potential GRE tunnel. Let us Verify one L2 GRE bug:-----. Tried with service-loopback binded to physical interface but still tunnel is showing down down. ” If successive GRE keepalives are not acknowledged, based on the configured interval and number of retries, the tunnel line protocol is marked “down. The tunnel interface allows for peering, which is required for most dynamic routing protocols. 我们发现tunnel口的配置没有问题,为了使tunnel口up,保持两个条件,一个是公网互通,一个是tunnel口中要有source和destination地址,我们都做到了,公网互通采用的是静态路由,可是,根据配置,我们发现了这样一个问题,tunnel口当前的源目地址是loopback口地址,而不. 10 Tunnel destination is 1. Re: Help with GRE tunnel in comware7 I have be trying to get GRE tunnel UP on comware 7 - 5900 model. Tunnel mtu is set to 1200. Oct 20, 2019. It's supported natively by the Linux kernel, as well as Cisco routers, and is the closest thing to a 'de-facto' VPN standard. By default, IPsec is enabled. You have been asked to correct configuration errors in the company network. The GRE tunnel is created first, then ipsec is used to encrypt the content of the tunnel. In case you still need help, Please post you're configuration ( preferably from both the Fortigate and the ASA ) you may send it via mail for more security. Currently I'm running. IPv6環境への移行するのにあたり、全ての機器がIPv6をサポートしているとは限りません。もし、IPv4のみをサポートする機器を経由したいならば、IPv6パケットをIPv4でカプセル化して通信を実現します。. This is coherent with other types of virtual interfaces (i. Approaches specified in this document might as well be used by other tunneling technologies to achieve. In the first two commands ("interface tunnel …" and "ip address …"), we enter interface tunnel mode and configure IP addresses of the GRE tunnel interfaces in the same subnet (12. Enhanced GRE header The GRE header used in PPTP is enhanced slightly from that specified in the current GRE protocol specification [1,2]. Administratively down/down - This implies that the interface has been. 2 (Loopback0), destination 4. 1, destination 172. 121 This creates a GRE tunnel between the local interface 9. The carried protocol goes by the name of payload protocol, while the protocol that encapsulates this data goes by the name of transport protocol. a) phase 1. By default, a GRE tunnel is protocol up, if the physical interface is up/up and there is a route to the GRE destination; If the far side of the GRE tunnel is not configured or down, this will cause a black-hole for traffic; In order to ensure end-to-end reachability, keepalives are used (off by default) Configuration. It is an expansion of point-to-point protocol (PPP) using the same authentication mechanisms as PPP [11]. 2/24 MTU 1514 bytes, BW 9 Kbit, DLY 500000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation TUNNEL, loopback not set Keepalive not set Tunnel source 61. Configure DMVPN Phase3 between R1, R2, and R3 as follows: Use R1 as the hub. I deleted the configuration lines for 2nd and readded them and, after that, second GRE tunnel came back up. Some sites configure their PPTP server to give to the server end of tunnel the same IP address that is used to contact the public interface of the server. tunnel-protocol gre source LoopBack1 destination 10. Last Modified. GRE Tunnel Protocol Down - Any help would be Awesome See the attached: Cant figure out why the tunnel had a 'down' protocol. I'm experiencing shocking network performance through a GRE tunnel from my Cisco 877 to a VPS in San Fran in the states. The ongoing trouble is your cement shoes outlook. A GRE Tunnel interface comes up as soon as it is configured and it stays up as long as there is a valid tunnel source address or interface which is up. Under normal circumstances, there are only three reasons for a GRE tunnel to be in the up/down state: There is no route, which includes the default route, to the tunnel destination address. Usable bandwidth is much higher compared with a leased line or a multiprotocol label switching (MPLS) link at the same price, and big keys or certificates can achieve a high level of security. Some sites configure their PPTP server to give to the server end of tunnel the same IP address that is used to contact the public interface of the server. but as we give Tunnel-IP in L3 GRE, they should be in same network like a point-to-point connection. And that's just to start. 38 and a destination of 172. It is an expansion of point-to-point protocol (PPP) using the same authentication mechanisms as PPP [11]. Three-dimensional tunnel interfaces are used in centralized GRE mode. up/down—The tunnel is up and the line protocol is down. We're running EIGRP. IPv6 translation happens on HAAP. I also have other GRE tunnels going from the same HP5510 to different MSR's which are working fine, config is replicated, so this is odd. Reset/down – This is usually a transient state when the tunnel is reset by software. Because of this, NAT devices often have a problem with ESP (read on for more on this). The private networks that need to be advertised over the tunnel would require you to run an overlay routing protocol. Example: Configuring a Next-Hop-Based Dynamic GRE Tunnels, Example: Configuring Next-Hop-Based MPLS-Over-UDP Dynamic Tunnels, Anti-Spoofing Protection for Next-Hop-Based Dynamic Tunnels Overview, Example: Configuring Anti-Spoofing Protection for Next-Hop-Based Dynamic Tunnels. Here is the configuration: interface Loopback0 ip address 10. GRE tunnels in particular are far easier to configure and scale out versus using IPsec in tunnel mode to handle routing. Provide details and share your research! But avoid …. 1ak amendment to 802. It operates at data link layer. Let’s start with ASA as the differences between ikev1 and ikev2 are very small. In computer networking, Point-to-Point Protocol (PPP) is a data link layer (layer 2) communications protocol between two routers directly without any host or any other networking in between. I also have other GRE tunnels going from the same HP5510 to different MSR's which are working fine, config is replicated, so this is odd. Practice 6. More struct gre_tunnel_key6_t_ Key for a IPv6 GRE Tunnel We use a different type so that the V4 key hash is as small as possible. The created IP tunnel entity is also called the Citrix Cloud Connector tunnel entity. Page 89: Creating A Secure Gre Tunnel Click Enable to enable the configuration and complete the following: For GRE Tunnel Information Interface Name Enter the name of the interface to connect to tunnel. Information About IPSec Virtual Tunnel Interfaces: The IPSec virtual tunnel interface greatly simplifies the configuration process when you need to provide protection for remote access and provides an simpler alternative to using GRE or L2TP tunnels for encapsulation and crypto maps with IPSec. In Cisco IOS Software Releases 15. For example, the code =20 indicates a single character with the hex value of 0x20, which is equal to decimal 32. Tunneling is a somewhat misleading term; there is nothing to actually "dig" through. PROBLEM GRE WITH OSPF - posted in CISCO SYSTEMS: hi all i need a help plz I have a problem with my configuration. For example, you can also transport multicast traffic and IPv6 through a GRE tunnel. Packet Received Displays the number of packets received on the tunnel since it was last cleared by the administrator. 38 0x00000002 2nd. Practice 6. On HAAP, the terminal host IPv6 prefix D-LAN will be mapped to C, which is CPE IPv6 prefix assigned by HAAP. We recreated the problem in our lab and it consistently failed. 3 Configure, verify, and troubleshoot GRE tunnel connectivity clinetworking 4. 134 (which allows your router to have several interfaces and choose which one to use for. PPTP – Point to Point tunneling protocol – tunnels PPP via IP. I've been looking to see if its possible to create a GRE tunnel between a Cisco 2901 with 3 adsl WIC cards and a Cisco ASA. GRE Tunnel 用默认路由建立时将出现down的情况。 Line protocol on Interface Tunnel0, changed state to up (Generic Routing Encapsulation):. Description: Tunnel Interface. Tunnel0 is up, line protocol is down Hardware is Tunnel Internet address is 192. $ sudo ip tunnel add gre01 mode gre remote 192. GRE is a protocol that runs over IP. When I do a show interface, it shows tunnel up, but line protocol down. 1, destination 2. keep alive 5 4 - where 5 in this case is the frequency and 4 is the retry before considerd down LAB 1 General Gre tunnel line protocol is up Hardware is Tunnel. Tunnel1 is up, line protocol is up Hardware is Tunnel Internet address is 192. GRE includes strong security mechanisms to protect its payload. The Spoke routers shut down Tunnel 10 and bring up Tunnel 20. 配置 Dynamic p2p GRE over Ipsec 配置 GRE 隧道 (1)在 R2 上配置终点为 R3 的 p2p GRE 隧道 R2(config)#int tunnel 23 R2(config-if)# *Mar 1 01:46:43. In Linux, you'll need the ip_gre. Reset/down - This is usually a transient state when the tunnel is reset by software. #3 NHRP registration with a Cisco router does not work gre-mygre Type: static Protocol the CHILD_SA for dynamic GRE tunnel doesnt get completed on hub and. OSPF is enabled on this interface. Before we begin with the tunnel configuration, we need to make sure no ACL is blocking GRE protocol (47) from the Incapsula Public IP to the Customer Public IP. Any idea why this is happening?. GRE supports broadcast and multicast B. On the 6th spoke, a 2911, we have created a Tunnel0. GRE tunnel interface comes up as soon as it is configured and it stays up as long as there is a tunnel source address or interface which is up. 509v3, LDAP and PKIX SCEP Protocol Tunnel End-point Discovery (TED) Protocol IPSec PMTU Discovery GRE and multi-GRE Protocol. How To Configure a l2-GRE tunnel That Bridges a VLAN Why is GRE tunnel showing Tunnel down and line protocol up? Does EXOS support multicast forwarding over GRE tunnel?. Follow @ASM_Educational Cisco CCNA GRE Tunnel Configuration Now I will do small Lab:The Goal is that PC1 (private Network) be able to Ping PC2 another Private Network, by going Via R3 which represent internet. Attempt to ping the IP address of PCA from PCB. show ip interface brief | include Tunnel - This command can be used to determine is up or down. The character => at the end of the line means the line is a duplicate route of the route on the next line. GRE Tunnel is down. MPLS directs data from one network node to the next based on short path labels rather than long network addresses, avoiding complex lookups in a routing table. ESP or encapsulated (e. Other spokes and hubs can ping this router's Tunnel 0 IP, but it can't ping itself. 53/30 MTU 17916 bytes, BW 100 Kbit/sec, DLY 50000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation TUNNEL, loopback not set Keepalive not set Tunnel source 172. Part 2: Verify Connectivity Step 1: Ping PCA from PCB. Tunnel Source Select the tunnel source (WAN1, WAN2, USB1, or USB2) from the drop-down list. newindianexpress. It's not just an EIGRP down or holding expired state, the line protocol on the tunnel goes down. Furthermore we told it to use the GRE protocol (mode gre), that the remote address is 207. 1/24 MTU 17916 bytes, BW 100 Kbit/sec, DLY 50000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation TUNNEL, loopback not set Keepalive not set Tunnel linestate evaluation up Tunnel source 1. Nick was among the first individuals to pass the CCIE Service Provider version 4 lab examination and this book represents his personal journey towards that end. Running head: CONFIGURE, VERIFY, AND TROUBLESHOOT GRE TUNNEL CONNECTIVITY 1 Configure,. down/down—The tunnel and line protocol are down. No matter what I try, tunnel interface is up, while line protocol is down. 1 (Vlan200), destination 10. 0 secondary ip address 10. Argo Tunnel. We tested, and it worked. x end Pretty much no matter what I do the interface status is always: Tunnel1 is up, line protocol is down. This means that each tunnel endpoint does not keep any information about the state or availability of the remote tunnel endpoint. GRE tunnels are designed to be completely stateless. Forum discussion: HI I Was sondering if anyone would know why my tunnel interface is reseting/down. PPTP – Point to Point tunneling protocol – tunnels PPP via IP. Router#sh int tun 0 Tunnel0 is up, line protocol is down Hardware is Tunnel MTU 1514 bytes, BW 9 Kbit, DLY 500000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation TUNNEL, loopback not set Keepalive not set Tunnel source 10. IP or MPLS) over another arbitrary network layer protocol. y] ttl 255 ip link set gre1 up ip addr add [z. The carried protocol goes by the name of payload protocol, while the protocol that encapsulates this data goes by the name of transport protocol. Answer: B C and ? Explanation. The key benefits are the ability to forward another protocol down it and the ability to route through the tunnel transparent to all the hops it goes through. This design supports DMVPN spoke routers that receive their external IP addresses. Such that when the primary link fails, i VPN tunnel should be setup with the backup link as seen in the config below. Loopback0 unassigned YES unset up up. GRE is not supported. April 16, 2015 – (as assigned) A. The current change makes that each GRE tunnel interfaces of the four different types available (gre, gretap, grev6 and grev6tap) gets the full protocol name. Destination 10. Generic Routing Encapsulation (GRE) is a tunneling protocol developed by Cisco Systems that can encapsulate a wide variety of network layer protocols inside virtual point-to-point links or point-to-multipoint links over an Internet Protocol network. To configure a Generic Routing Encapsulation (GRE) tunnel between the interfaces of two nodes, enter the following command: ifconfig gre0 tunnel 9. GRE over IPsec Configuration Route Based VPN Deployment with Cisco VPN Devices— December 24, 2006 8 GRE over IPsec Configuration In SmartDashboard, 1. GRE Keepalives. RA: Tunnel0 is up, line protocol is up (connected) Hardware is Tunnel Internet address is 192. I have configured a gre tunnel between a branch office and HQ. If you have a GRE tunnel configured through the cellular network be sure to route the end point of the GRE tunnel through the cellular interface, otherwise the tunnel will be down because the router detects recursive routing. Generic Routing Encapsulation (GRE) tunnels work just like a serial link, with virtual tunnel interfaces replacing physical serial interfaces. 2/24 Encapsulation is TUNNEL, loopback not set Tunnel source 10. I'm currently with TPG in Melb on ADSL2, sync at 13-14 Meg. 100 (The controller machine in the topology above), but with different tunnel remote IPs: 101 and 102. what should i do in order to have.