Now both networks Good overview. Do you need to configure static routes or is dynamic routing OSPF sufficient for the tunnel to operate? Yes,you can also use dynamic routing ,Only endpoint should be reachable i.
Dynamic routing and tunnels combination can be a dangerous. You need to be careful when using a dynamic routing protocol bcoz it cause a GRE tunnel to avoid the recursive routing error message, which brings down the tunnel.
This happens because the routers need to have a good path through the network to carry the tunnel to its destination. Make sure that the routers never get confused and think that the best path to the tunnel destination is through the tunnel itself.
Thanks for this, but i want to ask, in your example, the internet ip addresses used, would one have to get them off an isp or one can just pick up any one? I can ping the tunnel source and destination addresses and the tunnel seems to be up, but I can't ping the endpoints I checked all configs and compared them to another working tunnel, maybe someone has an idea? Thank you all for the possible answers. But it was another solution. Because of the tunnel vrf command I had left out.
CustomerX ipv4 Lo CustomerX-Q ipv4 Tu Thank you so much for the information and the explanation. It was so simple and straight forward. Buy or Renew. Find A Community. Cisco Community. Thank you for your support! We're happy to announce that we met our goal for the Community Helping Community campaign! Turn on suggestions. You configure how often keepalive messages are sent and the length of time that the interface waits for a keepalive response before marking the tunnel as operationally down.
The keepalive request packet is shown in Figure 1. The keepalive payload includes information to ensure the keepalive response is correctly delivered to the application responsible for the GRE keepalive process. Starting in Junos OS Release Fragmentation and reassembly of the IPv6 delivery packets is not supported. You can configure the keepalives on a generic routing encapsulation GRE tunnel interface by including both the keepalive-time statement and the hold-time statement at the [edit protocols oam gre-tunnel interface interface-name ] hierarchy level.
For proper operation of keepalives on a GRE interface, you must also include the family inet statement at the [edit interfaces interface-name unit unit ] hierarchy level. If you do not include this statement, the interface is marked as down.
Configure the hold time from 5 through seconds. Note that the hold time must be at least twice the keepalive time. To display the configured values on the GRE tunnel interface, run the show oam gre-tunnel command at the [edit protocols] hierarchy level:.
Display the current status information of a GRE tunnel interface when keepalive time and hold time parameters are configured on it and when the hold time expires. The Link status will be Up and the Gre keepalives adjacency state will be Down.
The current status information of a GRE tunnel interface with keepalive time and hold time parameters is displayed as expected when the hold time expires. To enable fragmentation of IPv4 packets in generic routing encapsulation GRE tunnels, include the clear-dont-fragment-bit statement and a maximum transmission unit MTU setting for the tunnel as part of an existing GRE configuration at the [edit interfaces] hierarchy level:.
If the packet size exceeds the tunnel MTU value, the packet is fragmented before encapsulation. The clear-dont-fragment-bit statement is supported only on MX Series routers and all M Series routers except the M router. If you commit gre-fragmentation as the encapsulation type on a standard Tunnel PIC interface, the following console log message appears when the PIC comes online:. The previous CLI constraint check that required you to configure either the clear-dont-fragment-bit statement or a tunnel key with the allow-fragmentation statement is no longer enforced.
When you configure the clear-dont-fragment-bit statement on an interface with the MPLS protocol family enabled, you must specify an MTU value.
There are lots of things you should check before opening a support ticket. Please be sure to include as much information as you can in the support ticket, please remember that we do not have access to your backend unless you provide a technical reading we won't have it. Unless we are contracted to provide management of your backend service it is strongly recommended you collect readings and identify the cause of your issue within reason before opening your ticket in order to make the best use of the resources available.
Check that you have a tunnel defined in the X4B panel and that you have at-least one Port referencing it. Check that you have not accidentally created a Reverse Proxy port, the port backend type will be "Encapsulated" or "Routed". A port must be defined referencing a tunnel for that tunnel to be deployed in a region.
If you have modified your tunnel configuration since downloading the script you will need a new tunnel. Check your configuration is sane, that you for example have defined tunnel spokes for the regions you are accessing from and ports referencing those.
If making outgoing connections over the tunnel is required to be defined in all regions. Check your firewall iptables-save. For Anycast services tunnel. Certain firewall software may erase rules not created by it and compability should be checked with any firewall software you are running.
Check for X4B tables in ip rule. The tunnel. These should exist for all tunnels deployed with tunnel. Pinging over the You can inspect for this with tcpdump -n ip proto You should see both a request and a reply. Check your connectivity to your backend communication IP s ping [backend ip] from your backend. A single tenant gateway routes between the GRE tunnels, thus routing packets to the appropriate tenant networks. This scenario can be used to integrate third party devices such as hardware load balancers into the tenant virtual network traffic flow.
For example, traffic originating from an enterprise site passes through a S2S tunnel to the multitenant gateway. The traffic is routed to the load balancer over a GRE tunnel. The load balancer routes traffic to multiple virtual machines on the enterprise's virtual network. The same thing happens for another tenant with potentially overlapping IP addresses in the virtual networks. Deploy a Software Defined Network infrastructure using scripts.
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