> I'm running a system where Windows systems will be communicating back and
> forth with a gumstix via UDP multicast and am having a problem.
> I have a send test app and a receive test app that compile for linux and
> windows. When I run both applications on the gumstix they can communicate
> fine. Same goes if both on are Windows. I can also send udp packets from
> gumstix and receive them in Windows. However I can't receive packets on
> gumstix that were sent from Windows.
> I consider myself a novice when it comes to linux, so I'm probably doing
> something dumb.
> To get multicast to work as I have it now I had to do the following:
> iproute add 188.8.131.52/4 dev eth0
> So I guess here are my questions:
> Is there something I need to do to enable receiving external udp multicast
> packets on the gumstix?
> And is there a command in linux to view packets being received on the
Ok, I'm still having the same problem but have a little more info... Here's
output from tcpdump showing the same packet being received from the various
machines. Which means the UDP packets are making it from Windows to the
gumstix, but I notice that messages from Windows have the ID in the IP
Header set, as well as DF (Don't Fragment) is set to false. Does this
provide any more info that might point someone where the real problem lies?
WINDOWS to Gumstix (does not get received by my socket)
-7:-45:-2.015784 IP (tos 0x0, ttl 15, id 35331, offset 0, flags [none],
proto: UDP (17), length: 444) 172.30.42.3.1165 > 184.108.40.206.47028: UDP,
LINUX to GUMSTIX (does get received by my socket)
-7:-43:-38.451991 IP (tos 0x0, ttl 15, id 0, offset 0, flags [DF], proto:
UDP (17), length: 444) 172.30.42.13.32771 > 220.127.116.11.47028: UDP,
GUMSTIX to GUMSTIX (does get received by my socket)
-7:-33:-10.955608 IP (tos 0x0, ttl 15, id 0, offset 0, flags [DF], proto:
UDP (17), length: 444) 172.30.42.110.1025 > 18.104.22.168.47028: UDP,
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