had the same problem... but solved it

setsockopt failed: Protocol not available (david)
Keywords: Help me!!!!!! Please
Date: Tue, 18 May 1999 15:20:06 GMT
From: Sven Woltmann <sven@woltmann.com>

Did you run "make [...]config"? This has a new entry for NAT that you have to activate before re-compiling the kernel.
Sven