04-18-2021 02:13 PM
Hi,
My backbone switch is constantly producing traffic from switch itself to 224.0.0.251:5353 in every 5 seconds.
I learned that it is bonjour traffic which i dont need.
Therefore i globally disabled bonjour discovery from the switch but i couldnt stop the generated traffic.
I tried to enable discovery to another dummy vlan (which is not routed) as control table interface but it didnt help.
I see the traffic on management vlan again.
Swith is SG550XG-24T and firmware is 2.5.5.47.
I discovered the problem through my firewall machine logs.
There is an interesting thing:
#show services tcp-udp
Type Local IP address Remote IP address Service name State
---- --------------------- --------------------- ------------ -----------
......
UDP6 All-5353 Bonjour
I dont know it is related or not. But I dont have ip6 conf by default.
Thanks
04-19-2021 04:38 AM
any comment?
04-20-2021 02:42 PM
I started to think that it is a firmware bug.
I have same problems with 350 series edge switches which have same firmware version.
I applied an access list to all switch ports to deny port 5353.
But this is a dirty hack for me and it is annoying.
04-20-2021 03:13 PM
Interested in this discussion.
How have you confirmed this as Bonjour traffic specifically? Asking only because mDNS/DNS-SD/Avahi all utilize port 5353 for multicast discovery/zeroconf.
04-20-2021 03:57 PM
Infact I am not sure it is Bonjour or not
I didnt inspect the packet. All I see is a traffic to 224.0.0.251:5353.
But I didnt see any setting for mDNS or Avahi in my switch.
So I concentrated on Bonjour, maybe I am wrong.
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