I did some more digging this morning and noticed that one of the interfaces on veb0 had a weird number of failures considering there is nothing physically attached to that interface.
# netstat -I aq0 Name Mtu Network Address Ipkts Ifail Opkts Ofail Colls aq0 1500 <Link> 00:e2:59:01:7e:35 0 0 93635 7414 0 So I removed that interface from veb0 and now the mbuf usage has stabilised. # netstat output Jan 14 08:48:01 80072/80160 mbuf 2048 byte clusters in use (current/peak) Jan 14 08:49:01 80126/80200 mbuf 2048 byte clusters in use (current/peak) Jan 14 08:50:01 80176/80248 mbuf 2048 byte clusters in use (current/peak) Jan 14 08:51:01 80286/80368 mbuf 2048 byte clusters in use (current/peak) Jan 14 08:52:01 80393/80472 mbuf 2048 byte clusters in use (current/peak) Jan 14 08:53:01 80441/80528 mbuf 2048 byte clusters in use (current/peak) Jan 14 08:54:01 80504/80592 mbuf 2048 byte clusters in use (current/peak) Jan 14 08:55:01 80556/80640 mbuf 2048 byte clusters in use (current/peak) Jan 14 08:56:01 80609/80696 mbuf 2048 byte clusters in use (current/peak) Jan 14 08:57:01 80620/80712 mbuf 2048 byte clusters in use (current/peak) Jan 14 08:58:01 80620/80712 mbuf 2048 byte clusters in use (current/peak) Jan 14 08:59:01 80621/80720 mbuf 2048 byte clusters in use (current/peak) Jan 14 09:00:01 80622/80720 mbuf 2048 byte clusters in use (current/peak) Jan 14 09:01:01 80619/80720 mbuf 2048 byte clusters in use (current/peak) Jan 14 09:02:01 80620/80720 mbuf 2048 byte clusters in use (current/peak) Jan 14 09:03:01 80620/80720 mbuf 2048 byte clusters in use (current/peak) I do remember now that this interface aq0 had some issues previously which is why nothing is attached to it, but I did not consider that it could still be consuming resources. I’m not sure if it is a hardware issue but I will try to trigger the previous interface and then start a new thread to investigate that as it looks like the PPPoE issues were just a symptom of this misbehaving hardware. Thanks for all the help with the pointers of where to look for culprits.
