I have a machine on a network which is served by two routers, one of which
is the default route at any given time.  The router selection happens via
gated and ICMP router discovery protocols.

The problem is, if I enable PMTU as well, routes to the then-current
router are added explicitly:

Destination        Gateway            Flags     Refs     Use    Mtu  Interface
default            204.152.186.61     UG         45  2355519      -  fxp0
204.152.188.171    204.152.186.61     UGHD        3     2119   1450  fxp0

What I'd like to see is:
204.152.188.171    default            UGHD        3     2119   1450  fxp0

so when the router changes, the connetion won't get screwed.

Is this possible using our current routing table bits?

--Michael