In the presence of both sockets that are and sockets that are not bound 
to a specific interface, those bound to the interface should always be 
favored for packet delivery over those not so bound.  Attached patch 
(against 2.6.0-test6) enforces these semantics by a slight adjustment to 
udp_v4_lookup_longway in net/ipv4/udp.c  The consequence of this change 
is to make SO_BINDTODEVICE bind more tightly than simple bind().

-- 
Casey Carter
Casey@Carter.net
ccarter@cs.uiuc.edu
AIM: cartec69