How to renumber PIX 501 inside IP address with VPN tunnel active?

Posted on 2007-10-14
Medium Priority
Last Modified: 2010-04-09
We have several offices using PIX 501s with site-to-site VPN going to a PIX 515.  I need to renumber the inside IP addresses while the VPN tunnels are active but when I attempt that, I lose access to the PIX.  Also since the PIX is serving DHCP at its location I have to disable DHCP first.  I tried opening Telnet to an outside IP address and configuring "Management-Access Outside" but that doesn't seem to work either.  Could someone help point me in the right direction?  Your help will be greatly appreciated!

Question by:WTFDon
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LVL 79

Expert Comment

ID: 20074996
You should be able to access the PIX through the PDM on the public IP address, not through the VPN tunnel.
You can SSH to the outside IP address if you want the command line.

Author Comment

ID: 20075023
Thanks for the quick response, Irmoore!  I tried SSH to the public IP on the PIX but wasn't able to establish a session.  I'm certain I can reconfigure the PIX if I can access it from outside but I didn't pursue this avenue because I was told by a colleague that you couldn't access the PIX 501 outside interface when a vpn tunnel was active.  Was that incorrect?  If so, could you tell me the correct statements to add to the config enabling SSH to be sure I've got them right?  Thanks for your help!
LVL 79

Accepted Solution

lrmoore earned 2000 total points
ID: 20075354
to enable ssh:

aaa authentication ssh console LOCAL
username yourusername password yourpassword
ssh outside  <== your IP Address
ssh timeout 5
ca generate rsa key 1024


Author Comment

ID: 20075678
That is EXACTLY the answer.  There are just a couple more things though:  You have to be sure to save the rsa key with "ca save all" and disconnect the vpn tunnel at the remote PIX by issuing "no vpnclient enable", access with SSH to make changes and then bring the tunnel back up with "vpnclient enable".  Thanks a mega for your help!

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