Nothing? You're able to arp 192.168.64.1 and 192.168.64.3, can you ping
them?
Since you have an RFC-1918 address on both the inside and the outside, I
assume you're running nat on this machine to translate internal machine
traffic. It looks like you have all the routes you need, so my _guess_
at this point is that when the public address is up, the nat is preventing
traffic from going out that interface without being translated. Once it
has a public address, it can't route properly on the 192.168.64/22 space.
Have a look at what you're using for nat. If you can't see anything
obviously at odds, post your nat/firewall/related config.
--
Bill Moran
Collaborative Fusion Inc.