no network access on today's CURRENT

[Bruce M. Simpson]

Denis Shaposhnikov wrote:
> Hi!
>
> Something strange. I've rebuild CURRENT today and have nonfunctional 
> network interfaces on SMP server with em(4). I can ping them from the 
> console but not from a network. CURRENT from the 20.03 works fine.
>
What does arp -an say when this happens?
When you tcpdump from both ends, what do you see?
netstat -in packet statistics should be updated whatever happens. what 
do you see?