DHCP down on WAN interface

[galmiklos]

Hi,

After upgrading to 21.7, I don't get an IP address from my ISP after reboot. I have to go to the WAN interface under Interfaces->Overview, and press "renew". I then get an IP address, but after some time (about 30 minutes) the internet stops working (cannot connect from browser). At the same time, I still can see an IP address on the interface on the dashboard.

BTW, the IP address is never shown under Interfaces->Overview, only on the dashboard, or on the console (ifconfig). I remember, before the upgrade, the IP address was shown under Interfaces->Overview, too.

What I see as something potentially wrong, is that the DHCP shows "down" under Interfaces->Overview, and if I log in at the console, the dhclient process is not running.

Shouldn't the dhclient process run in the background all the time? I vaguely remember having seen a check box after the 21.7 upgrade somewhere about running the DHCP client in the background, but I can't find it anymore.

Pressing the "renew" button under Interfaces->Overview fixes the issue (I can browse the internet), but in another 30 minutes I again have to press the "renew" button. If I don't, internet isn't working, although I can see I still have the IP address on the WAN interface.

Thanks,
Miki.

[opnhw]

Just writing to say that I'm seeing almost the same exact issue as you. For awhile, IPv6 was still able to route to the internet, only IPv4 WAN routing was broken. But now it affects the entire WAN link. Reloading DHCP on the interface helps for about half an hour. This problem just started today for me (May 4th, 2022) with OPNsense 22.1.6.

FYI: There's a reddit thread about this issue, it seems specific to Comcast customers. Apparently adding the modem LAN IP (eg. 192.168.100.1) to the WAN's DHCP lease rejection list is supposed to help.