Default Gateway on Different Subnet?

We recently changed a client's subnet from 192.168.1.x to 192.168.71.x.  All is fine, except that we neglected to change one of their devices to the 71.x subnet.  

We're remote now.  If we were onsite, we could change a computer to 192.168.1.x, connect to the device, and change its IP to 192.168.71.x,, then change the computer back.  But we're remote.  

If we change that computer's IP to 192.168.1.x, we lose internet connectivity.  

Is there a way we can still change the computer's IP to 192.168.1.x, but still use the default gateway of 192.168.71.1 to get to the device?  It's looking like we may have to go onsite to do this...

This is a very simple LAN; SOHO router/firewall.

Thanks!
K AAsked:
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zc2Commented:
Can't you just assign an additional IP address to the same interface? Thus you should both have access to the neglected device and not lose the connectivity while doing that.
K AAuthor Commented:
And leave the default gateway the same?  Just add another static IP address in a different subnet?  (Windows 7)
zc2Commented:
I believe you don't need to change the default gw on the W7 computer. Connect to it with the RDP, add an additional static IP address to its interface. Then do the configuration on the neglected device as you were onsite. Should work, I hope. ;) Try to simulate that locally before you mess with the remote network.

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Rob WilliamsCommented:
As zc2 stated, you should be able to add a second IP address, but no need for a second gateway.  For that matter, do not add a second gateway, you could loose your connection.  Once the IP is added you should be able to connect to the other device.  To do so, the PC must have a static IP, then go to TCP/IP properties, advanced, IP settings, Add.
K AAuthor Commented:
Dang - that worked!  Thanks!
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