secondary IP on wg0 fails

lejeczek peljasz at
Sat May 8 16:31:58 UTC 2021

Hi guys.

I'm experiencing a pretty weird wireguard, or perhaps 
kernel/OS stack bits behavior.

I have three nodes which all can ping each other on wg0's 
IPs but when I add a secondary IP:

-> $ ip addr add dev wg0

it gets weird, namely, say when that sec IP is on
A -> B ping returns; C ping waits, no errors, no return
B -> both C & A pings return
C -> neither A nor B ping returns

I'm on CentOS with 4.18.0-301.1.el8.x86_64.
All three nodes are virtually identical kvm VMs.

any suggestions as to what is not working here or how to 
troubleshoot are vey appreciated.
many thanks, L.

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