can't ping localhost

[Robert Bonomi]

> From owner-freebsd-questions at freebsd.org  Wed Mar 10 20:24:31 2010
> Date: Thu, 11 Mar 2010 02:23:44 +0000
> From: Anton Shterenlikht <mexas at bristol.ac.uk>
> To: freebsd-questions at freebsd.org
> Subject: can't ping localhost
>
> I misconfigured my system somehow,
> so now I can't ping localhost:
>
> # ping localhost
> PING localhost (127.0.0.1): 56 data bytes
> ping: sendto: No route to host
> ping: sendto: No route to host
> ^C
>
> # cat /etc/hosts
> # $FreeBSD: head/etc/hosts 109997 2003-01-28 21:29:23Z dbaker $
> #
> ::1                     localhost localhost.men.bris.ac.uk
> 127.0.0.1               localhost localhost.men.bris.ac.uk
>
> So far, can't find anything relevant
> on the net.
>
> Please advise

what does 'ifconfig -a', and 'netstat -nr' show?