>I dont know if you guys found an answer to this problem or its still not 
>solved,
>but i think im experiencing similar symptoms.
>
>                IP=10.0.1.1                                   IP=10.0.0.1 
>                  IP=10.0.0.5
>--------------[NetBSD-1.5]---------------------------------------[NetBSD-1.5N]---------[NetBSD-1.5N]
>  10.0.1.0/24            A/32         Internet              B/32 
>   10.0.0.0/24
>
>
>I can ping anything on the 10.0.1.0 net from 10.0.0.1 also i can ping 
>anything on
>the 10.0.1.0 net from 10.0.0.5, but once i cancel the first ping or try to 
>start another
>ping the 10.0.1.0 net becomes unpingable.

	please try to collect tcpdump traces on every interfaces you have.
	please send all of your relevant configurations (password/secret
	keys should be hidden, of course).

itojun