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I'm trying to receive MPEG-TS over UDP multicast transport in Arch Linux.

So when I run ffprobe -i udp://@224.1.1.240:6000 it hangs forever with no result. Then I run tcpdump and it shows no multicast traffic from the address.

But if there is running tcpdump -i eth0 -n net 224.0.0.0/4 in background while ffprobe, it works! tcpdump shows packets and ffprobe correctly detects a stream.

As one may notice the problem likely dissappears while NIC is in promiscuous mode.

Can someone help with it? What's wrong with my config?

  • Everything in iptables is ACCEPTed.
  • cat /proc/sys/net/ipv4/conf/*/rp_filter 0 0 0 0 0 0 0
  • ip r default dev ppp0 scope link 83.221.214.192 dev ppp0 proto kernel scope link src 10.7.248.143 192.168.168.192/28 dev enp3s0 proto kernel scope link src 192.168.168.193 224.0.0.0/4 dev enp3s0 scope link

Network connected to ISP through D-LINK DGS-1005A.

PS Everything works perfect in Windows 7 on the same PC.

TrueBers
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1 Answers1

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I know the question is old, but... it was necessary to set the allmulti flag on your network card

ifconfig enp3s0 allmulti
zersh
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