Thread: Unable to receive multicast

for last couple of days, i've been unsuccesfully trying receive multicast packets on ubuntu server 11.04, , seen strange things along way. program use test this, http://www.scribd.com/doc/38224328/mcreceive-c.

network has been configured forward me multicast packets, regardless of joins. tcpdump shows me:

code:

15:16:11.308952 ip 10.164.130.2.61417 > 224.16.17.23.47806: udp, length 1400 ...

however, after starting test program, multicast packets magically disappear tcpdump output, seems strange side-effect.

@ same time, "recvfrom" call in mcreceive.c blocks , returns no value.

verified interface has joined group:

code:

netstat -g | grep 224.16.17.23 eth3            1      224.16.17.23

and i'm listening on right port:

code:

netstat -l | grep 47806 udp        0      0 *:47806                 *:*

searching forum, found rpfilter might issue, disabled it:

code:

 cat /proc/sys/net/ipv4/conf/*/rp_filter 0 0 0 0 0 0 0

anybody thoughts on else solution ?

thanks,
steven

i think have use ip_add_source_membership instead of ip_add_membership , mention source ip address of sender

Forum The Ubuntu Forum Community Ubuntu Official Flavours Support Networking & Wireless [ubuntu] Unable to receive multicast

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