I'm attempting to set up basic communication with the RIPv2 protocol with BIRD v1.6.0. I've got `Host A` with an interface `enp0` that has address `10.0.1.50/24`. I've got another host `Host B` with an interface `enp1` that has address `10.1.1.25/24`. These interfaces are directly connected by cable. I can ping between both machines if I add a static route on both machines. I have the following `bird.conf` on `Host A`: protocol kernel { learn; # Learn all alien routes from the kernel persist; # Don't remove routes on bird shutdown scan time 20; # Scan kernel routing table every 20 seconds export all; # Default is export none } protocol device { scan time 10; # Scan interfaces every 10 seconds } protocol direct { interface "enp0" } protocol rip MyRIP { export all; import all; interface "enp0" { mode multicast;}; } The `bird.conf` on `Host B` is identical except the `enp0` is replaced with `enp1` After starting the bird daemon on both hosts, I can do a `tcpdump -ni enp0 -vv` 13:21:41.943537 IP (tos 0xc0, ttl 1, id 4933, offset 0, flags [none], proto UDP (17), length 132) 10.1.1.25.520 > 224.0.0.9.7742: [udp sum ok] UDP, length 104 13:21:41.943704 IP (tos 0xc0, ttl 1, id 150, offset 0, flags [none], proto UDP (17), length 272) 10.0.1.50.520 > 224.0.0.9.7742: [bad udp cksum 0xec48 -> 0x1219!] UDP, length 244 I can hop inside the `birdcl` command-line and run `show rip neighbors` and get an empty table. If I set the addresses to be on the same subnet, I can run `show rip neighbors` and I can see `10.0.1.50` in my lists of neighbors. If I run 'echo all' in the bird command line I see this message: >>> MyRIP: Bad packet from 10.1.1.25 via enp2s0f0 - not from neighbor (0) How can I get these routers to list each other as neighbors if the two ends of the link aren't on the same subnet? Best Regards, Travis Pressler