> I assigned an IP address to LAN interface and was able to get into
> WebGUI. Then I went to 'OPT1' page and setup bridging between WAN and
> OPT1. So far so good. Then I tried to enable OPT1 interface and as soon
> as did this m0n0 GUI stopped responding although traffic between WAN and
> OPT1 was Ok. I also wasn't able to ping LAN interface. Rebooting m0n0
> didn't help and I was forced to reset config. I played with firewall
> rules and allowed any to any on all interfaces but no success.
I would have done it in that order:
1 - enable OPT interface
2 - bridge between OPT and WAN setup
It seems you've done it in the reverse order. I don't know if it's
relevant in your case, but who knows?...