Thanks for your replay, Reco. Yes, in Stretch networking works well both - with and/or without directive "auto". In contrast Buster with: auto bond0.20 iface bond0.20 inet manual auto bond0.21 iface bond0.21 inet manual gateway is unreachable by ping. So I don't know why yet. Ales From: Reco <recovery...@enotuniq.net> Date: Fri, 4 Jun 2021 16:51:05 +0300
It's just a guess, but you have "auto" for "bond0":
auto bond0 iface bond0 inet manual
But what you do not have is "auto" for VLAN interfaces you build on top of bond0:
iface bond0.20 inet manual iface bond0.21 inet manual
