I have been trying a few times but I can’t get it working. I have a local network in the 192.168.1/0/24 range. I have now two routers behind each other and that works. Now I want to put a third router in between to accelerate IKEv2 as I do with the two routers.
Router 1 has the local network attached and connected to the second router on 10.10.10.0/29 network.
Ether1 has IP address 10.10.10.2/29 and the routes are: the gateway (route) on ether1 has 0.0.0.0 → 10.10.10.5 Ether1
Router 3 has the PPPoE connection to the internet on ether1 with the ARP set to reply-only. On ether4 sits the IP 10.10.10.5/29
Now I want to put a router (2) between those two and I can get traffic from router 10.10.10.2 to router 10.10.10.5 but it does not returns despite what I tried.
Schematic what I want:
router 3 router 2 router 1
10.10.10.5/29 <--> 10.10.10.3/29 <--> 10.10.10.2/29
When using ICMP in Routertrace then I can reach router 1 from router 3 however using the UDP option does not work then. Directly connected UDP works and from router 3 to router 2 it also works.
I tried to it with proxy-arp besides it still did not work I got in ARP table also the IKEv2 connection active on router 3 which I don’t want.
How can I connect the three routers up in the easiest way and have the possibility to take out the router 2 if needed and then to to no or minimal changes in the config of both remaining routers?