From: Heikki Hannikainen hessu@hes.iki.fi Date: 10/01/2013 10:01 PM
To: AMPRNet working group 44net@hamradio.ucsd.edu
I think I have found and fixed a problem which caused rip44d multicast reception to mysteriously fail on some systems.
Interesting story. I thought it might be the reason for my battle with the multicast socket on the Raspberry Pi, and I have checked the setting of rp_filter on it, but when I do:
cat /proc/sys/net/ipv4/conf/*/rp_filter
I get:
0 0 0 0 0 0
So it looks like the rp_filter is off for all interfaces on this system. It could be a good idea indeed to turn it on, although I have some DROP rules for obviously spoofed traffic in my firewall, but that is not going to help solving the multicast problem. Apparently there is more than one reason why it could fail... still have not found what is going wrong here.
Rob