dropping ethernet connection

[npatterson]

Hello,
For the last 2-3 days, I have been experiencing disconnects from my router. I looked in syslog and I see this about the time that the disconnect occurs:

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Nov  8 15:35:01 m93p CRON[2475]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
Nov  8 15:37:26 m93p avahi-daemon[619]: Withdrawing address record for 192.168.0.147 on eno1.
Nov  8 15:37:26 m93p avahi-daemon[619]: Leaving mDNS multicast group on interface eno1.IPv4 with address 192.168.0.147.
Nov  8 15:37:26 m93p avahi-daemon[619]: Interface eno1.IPv4 no longer relevant for mDNS.

I updated my system sometime in the last 3-5 days, and I'm wondering if this has something to do with my problem.

I am running Buster with Linux 4.19.0-18-amd64.
Synaptic tells me that avahi-daemon version 0.7-4+deb10u1 is installed.

Any help you can give me would be greatly appreciated.

[NorthEast]

Looks like it could be a dns issue. Code from my connection which is wifi rather than ethernet, looks like the following in which you can see where the successful terms differ from the failures in your code:

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Nov 11 07:46:56 owl avahi-daemon[582]: Leaving mDNS multicast group on interface 547.IPv6 with address fe80::d237:45ff:fe19:c547.
Nov 11 07:46:56 owl avahi-daemon[582]: Joining mDNS multicast group on interface 547.IPv6 with address 2xxx:8xxx:cxxx:fxxx:dxxx:4xxx:fxxx:cxxx.
Nov 11 07:46:59 owl avahi-daemon[582]: Joining mDNS multicast group on interface 547.IPv4 with address 192.168.0.15.
Nov 11 07:46:59 owl avahi-daemon[582]: New relevant interface 547.IPv4 for mDNS.

I would consider resetting the router which I presume allocates the addresses from the code you provided as well providing dns.

[npatterson]

I upgraded to Debian Bullseye 3 days ago and haven't had a problem since. During the upgrade, I was notified that the avahi configuration was not the default. I chose the default config. for the upgrade.