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To change the starting address of the pool range of IP addresses, in the Start 
Address box, type the lowest IP address of the new range of addresses for the pool.

All addresses in an IP pool must be on the same Class C network, so 
the first three octets of the start and end addresses must be the same. 
For example, if the start address is 192.168.1.1, the end address must 
be between 192.168.1.2 and 192.168.1.254. 

To change the ending address of the pool range of IP addresses, in the End 
Address box, type the highest IP address of the new range of addresses for the 
pool.

Click Submit.

Result: The edited IP pool appears in the AAA Server IP Pools table.

The Reset function recovers IP addresses within an IP pool when there are 
“dangling” connections. A dangling connection results from a user disconnecting 
without Cisco Secure ACS receiving an accounting stop packet. If the Failed 
Attempts log in Reports and Activity shows a large number of “Failed to Allocate 
IP Address For User” messages, consider using the Reset function to reclaim all 
allocated addresses in this IP pool.

Using the Reset function to reclaim all allocated IP addresses in a pool can 
result in users being assigned addresses that are already in use.

To reset an IP pool and reclaim all its IP addresses, follow these steps:

In the navigation bar, click System Configuration.

Click IP Pools Server.

Result: The AAA Server IP Pools table lists any IP pools you have configured, 
their address ranges, and the percentage of pooled addresses in use.