I'm seeing unexpectedly high CPU that looks related to the kea-dhcp4 process. I'm running version OPNsense 26.1.5-amd64.
Observed behavior:
- The CPU widget on the dashboard shows all CPU cores pinned above 90%, often at 99+%. I first noticed this back a couple weeks ago as of March 25, 2026 and it has persisted through a few updates but I don't have more specific historical version info.
- Via shell (top), I can see that the kea-dhcp4 process is at 100% when no other process indicates it is taking up meaningful CPU capacity.
- I do not see much of interest in the logs but I'm not sure I am looking comprehensively.
- In the "General" log, I see no entries lower than Notice since last reboot and little that appears directly related. I do see the dhcp6c process issuing errors and exiting but I do not know if those could be related.
- In /var/log/kea/latest.log I see two WARN messages that appear to be related to multi-threading being enabled then about 19 or so INFO logs per hour which seems expected.
My
suspicion, given I have not seen many widespread reports of this, is that it is related to my configuration but I don't know if there are any diagnostics or other avenues I could pursue to determine the cause. I wanted to see if this is something anyone might have insight into before considering opening an OPNsense issue. If there is other information that might be useful to look further, please let me know. Thanks in advance for any help.
Hi,
I got the same situation after configuring the following:
before:
I have a bridge0, it is 1 member, a lan interface
after:
I've added ovpns1 to the bridge, put openvpn in tap mode
At the moment I don't have any usefull logging, can you say if your configuration with bridge interface and vpn is perhaps the same?