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How do I change the default IP Address on the Airport Base Station?

I have an Airport Snow that I use with both my Mac iMac G4 and PC desktop.  I've been trying to access my company's VPN using Avaya VPN Client using my Wintel setup.  I can link up to the VPN without problems via a wired network outside my home environment.

From home, I can make the initial connection.  Or at least it appears to link, but when I ping my company's server I receive no returned packets.

My IT department (who are not familiar with ABS) has told me that the company's network has the range of IP Addresses reserved and Subnet and that any IP Addresses in this range would conflict.  Of course the default ABS IP Address is

Here's what I need to know:

1) How do I change the IP Address on the base station?  Is this a firmware thing?
2) Once I get that resolved, is there VPN client software for Mac that I can use that is compatible with Avaya VPN Client.

Thanks ahead of time,
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1 Solution
The ABS internal IP (LAN) is fixed for using DHCP. The external IP (WAN) is controlled by the settings in Airport Admin Utility under the Internet tab (Configure Manually, or Using DHCP). My base station has DHCP and NAT turned off on the LAN side since the DSL router provides DHCP to the ABS, a PC and several laptops.

I'm not sure how your VPN connects through the Wintel thing but try making the base station just a wireless bridge to your working wired system.
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