Here are a few things to check:

1. Only 1 IP address assigned to a NIC on the GNAT Box, in the same 
logical network as other IP addresses (aliases or real) can have the 
real netmask of the network/subnet.  This means if you add aliases in 
the same subnet they must all have 255.255.255.255 netmasks.

Example:

EXT: 199.120.225.2/255.255.255.0
Aliases:
Ext:  199.120.225.3/255.255.255.255
Ext: 199.120.225.10/255.255.255.255

Now if you had the same thing and added a new alias from a different 
network it would be:

EXT: 199.120.225.2/255.255.255.0
Alias:
EXT: 199.120.225.3/255.255.255.255
EXT: 198.1.200.5/255.255.255.0     <-- A real subnet mask here now
EXT: 198.1.200.9/255.255.255.255   <-- Notice the mask on the additional entry


2. Your change to the EXT NIC may have caused the problem.  Since all 
the IP addresses assigned to a NIC are stored in a linked list. 
Nearly always the real IP address is the first element in this list, 
since it must exist first before aliases can be added.  If you change 
it the element is deleted and added back to the list (since all IP 
addresses assigned to the NIC are treated alike) at the end.

So to resolve this, on the alias screen do a save. This will delete 
the alias list and rebuild it, adding the aliases in the link list 
after the real IP address.  If this doesn't unclog things you might 
also need a reboot.

Changing the IP address or mask on the network information screen 
sometimes requires a reboot since many things are based and keyed 
from this information.

Paul


>Send postings to: [EMAIL PROTECTED]
>Access the list archives at:
>http://www.gnatbox.com/gb-users/
>----------------------------------
>Thanks for the manual info to Michael W. Burden (and Paul Emmerson). 
>
>However I am still experiencing the EXT interface problem.  The 
>Verify Configuration page shows the following...
>
>NAT
>  Verify aliases.
>     ERROR: Alias 1 has same address (xxx.xxx.xxx.2) as 
>"EXT.SREL.edu" interface.
>
>Before there were no errors.  Alias 1 was set to xxx.xxx.xxx.11 
>originally.  Now the NAT column of the Active Connections page 
>starts popping up with the xxx.xxx.xxx.11 address for connections. 
>
>There are no Static Address Mappings (previously refered to as Outbound?). 
>
>The only recent config changes were to...
>a) Modify the EXT subnet from 255.255.255.0 (24) to 255.255.255.192 
>(26).  This changes the network range from xxx.xxx.xxx.0-255 to 
>xxx.xxx.xxx.0-64.
>b) Add IP Pass Through to the PSN, ip addresses xxx.xxx.xxx.128-255, 
>subnet 255.255.255.128 (25).
>
>Then the EXT started assuming the IP of Alias 1, not the assigned 
>IP.  Is the ramdisk image corrupt?  We haven't rebooted since the 
>modifications, but you should be able to make changes like this on 
>the fly. 
>
>
>Jason S. Antonacci
>Computer Support Specialist IV
>Univ. of Georgia - Savannah River Ecology Lab
>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>Office: 803.725.5894
>Pager: 706.869.4043
>Fax: 503.218.7129
>Email: [EMAIL PROTECTED]
>
>>>>  Paul Emerson <[EMAIL PROTECTED]> 25 Jan 00 19:30:21 >>>
>Send postings to: [EMAIL PROTECTED]
>Access the list archives at:
>http://www.gnatbox.com/gb-users/
>----------------------------------
>The 3.0 manual is provided in PDF format on the CDROM and in the
>downloadable installer.  We have not printed a manual yet as we are
>waiting to include the VPN information for the next installment of
>3.0.
>
>Have you run a configuration verification?  Did it report any errors
>or warnings? I think perhaps your alias definitions have some
>problems.
>
>Also you may have a mis-configuration with Static Outbound Mapping.
>You may have accidently mapped your entire internal network or some
>servers to the address of an alias.  If so you'd see the behavior you
>described.
>
>If you are one support send your configuration report to [EMAIL PROTECTED]
>
>Paul
>
>
>>Send postings to: [EMAIL PROTECTED]
>>Access the list archives at:
>>http://www.gnatbox.com/gb-users/
>>----------------------------------
>>We access several sites that use reverse DNS lookups for security.
>  >We also have external aliasaes for a variety of PSN and PRO
>>computers.  Recently (3 months ago) we upgraded to 3.01 from 2.20.
>>Evidently the GNATBox is taking its IP from the first external alias
>>instead of the IP specified in Basic Configuration>Network
>>Information.  Is this a bug or a feature.  We have no GB3.01
>>documentation, just the GB2.2.
>>
>>TIA,
>>
>>
>>Jason S. Antonacci
>>Computer Support Specialist IV
>>Univ. of Georgia - Savannah River Ecology Lab
>>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>Office: 803.725.5894
>>Pager: 706.869.4043
>>Fax: 503.218.7129
>>Email: [EMAIL PROTECTED]
>>
>>----------------------------------------------
>>To Unsubscribe: send mail to [EMAIL PROTECTED]
>>with "unsubscribe gb-users your_email_address
>>in the body of the message
>
>-------------------------------------------------------------------------
>Paul Emerson                               Tel: +1.407.380.0220 x106
>Global Technology Associates, Inc.         Fax: +1.407.380.6080
>3505 Lake Lynda Drive                   Mobile: +1.407.497.3379
>Suite 109                                Pager: +1.888.440.8232
>Orlando, Florida 32817                   Email: [EMAIL PROTECTED]
>USA                               Mobile Email: [EMAIL PROTECTED]
>                                             Web: http://www.gta.com
>-------------------------------------------------------------------------
>
>
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-------------------------------------------------------------------------
Paul Emerson                               Tel: +1.407.380.0220 x106
Global Technology Associates, Inc.         Fax: +1.407.380.6080
3505 Lake Lynda Drive                   Mobile: +1.407.497.3379
Suite 109                                Pager: +1.888.440.8232
Orlando, Florida 32817                   Email: [EMAIL PROTECTED]
USA                               Mobile Email: [EMAIL PROTECTED]
                                            Web: http://www.gta.com
-------------------------------------------------------------------------



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