i'm getting teh same problem, i played LFS a longgg time ago, and it all worked fine, checked port redirections, checked isp etc.
just gonna restart router/pc now and see if that does anything.
btw running tracert now, very very strange... hop 1-4 request timing out, 5 gets 150 ping from an ntl.com, and then rest time out again. i'll look into it a bit further.
any further help would be awesome though