dns resolve failure when ip address changes

freebsd 4.6-rc of a few weeks ago
moz 1.0rc1  Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.0rc1) Gecko/20020505 <developer build>

i switch between vpns (home, corp, ...) by removing my wireless card,
changing wireless config, and reinserting the wireless card.  this
causes a new dhcp cycle, which gets me an appropriate ip address on
the vpn, a new set of dns server(s) for resolv.conf, etc.

when i do that, mozilla can no longer resolve names.  it is as if it
has cached the old dns server ip address (which is no longer reachable).

if i exit moz and restart it, all is now normal.

clues?

randy


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