When I'm using 802.11 in low signal conditions, I sometimes find that 
my default route has gone away.  I assume that something in the kernel 
has decided that the route is losing somehow, and deletes it.  Is there 
any way to disable that?  It makes sense for learned routes, but when 
the default route is the only way out -- and that's almost always the 
case for me -- it's rather annoying.  (My IP address and default route 
are installed via dhclient.)


		--Steve Bellovin, http://www.research.att.com/~smb