I dont even think it makes a difference if its the lan or the wan ip, as far as i can assertain its only used in DCCing after you have connected to the irc server anyway.
I would also assume if you had a dynamin wan ip, you wouldnt have a valid one in there between machine restarts anyway, so it would need to be resolved by the irc server you connect to, since thats how you get it, i cant see if would have ever caused problems connecting.
(reply more in general than directed specifcily)
