avahi - Where multicast packets could be filtered? -

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i installed openwrt distro on router , enable support of avahi in it. goal discover network services in network.

i plugged pc lan port announced services. on router run tcpdump on bridge interface : tcpdump -i br0 -vvn udp port 5353

during avahi browse execution receive output: root@localhost:~# avahi-browse -art

21:55:22.995004 ip (tos 0x0, ttl 255, id 0, offset 0, flags [df], proto udp (17), length 74)     192.168.1.1.5353 > 224.0.0.251.5353: [udp sum ok] 0 ptr (qm)? _services._dns-sd._udp.local. (46)

but on pc wireshark didn't show multicast queries during call, hence no services found.

does mean router filter multicast packets somehow? way know filter in ebtables, shows nothing filtering of mdns addresses:

root@localhost:~# ebtables -l bridge table: filter  bridge chain: input, entries: 1, policy: accept -j ro_input  bridge chain: forward, entries: 1, policy: accept -j ro  bridge chain: output, entries: 1, policy: accept -j igmpproxy  bridge chain: ro, entries: 0, policy: return  bridge chain: ro_input, entries: 0, policy: return  bridge chain: igmpproxy, entries: 4, policy: return -p ipv4 -o wl0.1 --ip-dst 239.0.0.0/8 -j drop  -p ipv4 -o wl0.2 --ip-dst 239.0.0.0/8 -j drop  -p ipv4 -o wl0.3 --ip-dst 239.0.0.0/8 -j drop  -p ipv4 -o br0 --ip-dst 239.0.0.0/8 -j drop

where these multicast packets filtered/dropped?

i found in router snooping enabled, think corresponds igmp snooping

after disabling it, multicast dns queries reached destination , show wireshark.

here i've done (of course path vary in different hardware , distro):

echo "0" > /proc/hwswitch/default/snooping

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