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I found this thread when searching for a solution for the exact same issue.

Based on the newwanip hint in the thread you linked, I cowboyed this solution together by adding the following 2 functions to /usr/local/etc/inc/plugins.inc.d/wireguard.inc.

It seems to work.

Code Select Expand

function wireguard_configure()
{
    return [
        'newwanip' => ['wireguard_configure_do'],
    ];
}

function wireguard_configure_do()
{
    mwexec("/usr/local/sbin/configctl -dq wireguard restart");
}


On WAN interface DHCP renew -

2023-08-28T14:11:22   Notice   kernel   <6>wg2: link state changed to UP   
2023-08-28T14:11:19   Notice   kernel   <6>wg1: link state changed to UP   
2023-08-28T14:11:19   Notice   kernel   <6>wg0: changing name to 'wg1'   
2023-08-28T14:11:19   Notice   kernel   <6>wg2: link state changed to DOWN   
2023-08-28T14:11:19   Notice   kernel   <6>wg1: link state changed to DOWN   
2023-08-28T14:11:19   Notice   opnsense   /usr/local/etc/rc.newwanip: plugins_configure newwanip (execute task : wireguard_configure_do())

Thanks for helping me find the original thread! I hope this helps you.