specifying the default gateway to some dummy ip address (same subnet) in both virtual machines.
$ vi /etc/defaultrouter and add the IPADDRESS of your router.
EXAMPLE:
vi /etc/defaultrouter
192.168.157.100
reboot to test. or netstat -r (This will show the current routing table)
Another Example: route add destination gateway
Example:
# route add default 192.168.157.100
netstat –r (This will now show your 'new' default gateway).
