Routing question?

[Robert Middleswarth <robert@middleswarth.net>]

Here is what I am tiring to do?  I have both a public IP and private IP 
address for this we will call them 70.1.1.5 and 192.168.10.5.  The 
192.168.10.5 has a gateway of 192.168.10.1 and it routes out to 
192.168.x.x address.  The 70.1.1.5 has a gateway of 70.1.1.1 and routes 
to the inet.  I haven't be able to get this to work.  I have searched 
and can't find what I am looking this is the closest I have found but 
can't figuire how to use.  This is my current interface setup.

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
       address 70.1.1.5
       netmask 255.255.255.192
       network 70.1.1.1
       broadcast 70.1.1.63
       gateway 70.1.1.1

auto eth1
iface eth1 inet static
       address 192.168.10.5
       netmask 255.255.255.0
       network 192.168.10.0
       broadcast 192.168.10.255

This works but only if the I am connecting or talking to 192.168.10.x IP 
 if I try to connection 192.168.11.20 it wont work then I tired.

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
       address 70.1.1.5
       netmask 255.255.255.192
       network 70.1.1.1
       broadcast 70.1.1.63
       gateway 70.1.1.1

auto eth1
iface eth1 inet static
       address 192.168.10.5
       netmask 255.255.255.0
       network 192.168.10.0
       broadcast 192.168.10.255
       gateway 192.168.10.1

This caused my public IP trafic to go thought my local IP network 
resulting in major problems with the connection.  I known I am missing 
something simple but can't see it now.  If there is doc for networking 
under debian please point me to it.

Thanks
Robert