Introduction

I'm attempting to set up basic communication with the RIPv2 protocol between two hosts running the BIRD routing daemon.

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.

Configuration Files

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

Initial Results

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.

Making it work

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.

Wrap-up

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?

I must have some sort of incorrect mental picture of how networks work, don't routers need talk to neighbors which aren't on the same subnet all the time?

I'm not hung up on a BIRD-specific answer.

I am trying to understand some things about Rip V1 and V2 but I'm not sure if I'm right,

As I know Rip V1 doesn't "advertise" subnet masks, and doesn't support VLSM. If i understand right Even if Rip V1 for example supports VLSM it doesn't matter, Becouse the Rip V1 Only "advertise" the IP address, If some one can please confirm/expand/correct me I will be very thankful, Thank you all and have a nice day.

I am quite confusing with the Cisco IOS command.

what's the actual difference between redistribute static as i learn in EIGRP whereas default-information originate in RIP/RIPv2/OSPF?

I hope to get some answer over here as i can't find the difference from google neither cisco website.

What is the difference between OSPF and RIP? Could someone explain the advantages and disadvantage？ Also when I should use one or the other.

I have a IPv6 static route on a Cisco 2600 that is being redistributed to other Routers in the same OSPFv3 area. One of the routers (not the one with the static route) is also a participant in a RIPng group. The OSPF routes are set to redistribute connected routes to RIPng, but the static route is not included in the redistribution. The border router that is connected to both areas has the static route as type OE2. Is there a command that I'm missing?

EDIT : I've created a diagram that shows a (simplified) topology of what I'm working with. We have a 6to4 tunnel between R1 and R5 (to traverse an IPv4 section of our network). Unfortunately, this link is treated as NBMA, thus static routes are required to establish the link between these two routers. The static route is defined at R1 (with redistribute statc on), visible through OSPFv3 on R2, but not being redistributed on R3 (even though all other learned routes on R2 ARE being redistributed).