2 interfaces and "Ignoring MISS from non-peer"

One of my parents has 2 interfaces. When I configure my Squid to use my
parent's interface A, I get lots of "ignoring MISS" in cache.log, with
the interface B IP address. Then a few minutes later, I get a "Detected
DEAD Parent".

However, when I configure Squid to use my parent's interface B,
everything is ok: no "ignoring MISS" and no "Detected DEAD Parent" (at
least after a few hours).

-- 
Marc Delisle                              
Service Informatique                              
Collège de Sherbrooke      
Québec.  819/564-6223