I'll be getting a machine soon that will have a built-in wireless 
interface and an Ethernet.  At times when both are receiving signals, 
I'd like the Ethernet to be used.  In particular, I'd like the default 
route to point to the Ethernet-received default, since that will ensure 
that (most) connections will use the Ethernet's IP address as their 
source addresses.  The ideal way would be some sort of "priority" line 
in the "interface" statements of dhclient.conf.  All I see, though, is 
that I can write a clumsy enter-hooks script that would check $reason 
and $interface, and the current status of the routing table.

Has anyone implemented anything like that?


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