ripd, multicast and route to 224.0.0.0/4

[Eugene Grosbein]

Hi!

Who is guilty: ripd or FreeBSD kernel? Or I am?

My router has default route via its em4 interface (and there is eBGP session)
and has to announce default route using RIPv2 to the network reachable
through em3.

So T configure ripd:

router rip
  version 2
  network em3
! Just to be sure: em3 is configured as 172.20.2.75/24
  network 172.20.2.0/24
  default-information originate
  redistribute kernel
  redistribute static
  redistribute connected
!

It seems that ripd (I tried zebra and quagga from fresh ports) will
send its multicast announces using the interface that a route to
224.0.0.0/4 points to. So, ripd sends its RIPv2 multicast packets
to my uplink network via em3 if the router does not have a specific
route to 224.0.0.0/4 pointing to em3. Why? And what should I do
if I will need to send RIPv2 to em0, em1, em2 and em3?

Eugene Grosbein