[mmh2288]

Two routers chained together:

Lower router's WAN port is connected to upper router's LAN porter.
PC1 is connected to upper router's LAN port.
PC2 is connected to lower router's LAN port.

From PC1 ping PC2, the ping won't go through.

I can see RIPv2 messages sent from lower router broadcasting its WAN side IP
as the next hop. Why my upperside outer not using it to route the ping over
to PC2? Does router accept LAN side dynamic routing updates?

Help appreciated.

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is this a homework question?

[dsenette]

is this a homework question?

[mmh2288]

Unfortunately, nope.
Actually, the lower router is going to be replaced with a single board computer
with built-in router function. Just using two routers as a step to debug.

[dsenette]

is this whole setup going to be like this permanently. with a router hooked directly to a computer that's acting like a router? why exactly do you have 2 routers directly connected as such?

[mmh2288]

The targetted configuration would be:

A router whose LAN ports connect to PC1 and the single board computer, let's call it SB.

The SB only implemented part of router functions -- like DHCP function so that it can give
out IPs in its own little network. This is business requirement for the system I am working on.

The goal is for PC1 to ping any DHCP clients that connected to SB without manually
setting up static routes on the router. That's why I am simulating the scenario
by replacing SB with another router.