MySQL数据库错误：在插入期间不允许大于max_allowed_packet的数据包

I've never really had this error before but I am doing a rather large insert. How do I increase this setting? Also, how do I tell how much I am over what's allowed? I tried looking up the error, but i'm not using Fogbugz. Any help would be awesome.I've never really had this error before but I a