System SBS 6.5 sp1 BM 3.8.

I added a second secondary address to the public NIC for GWIA NAT. The
first secondary address is for WEB server.

The secondary address for WEB works OK, though the command 'add
secondary IPaddress 81.xxx.xxx.83" in AUTOEXEC.NCF has a # mark in front
of it.

While booting the NEW secondary address for GWIA , display on the
console the following:
IP address 81.xxx.xxx.82 Does not match any local address.

My public IPadresses are 81.xxx.xxx80 to 87, mask
The internal \ private IPaddresses are 192.168.x.x mask

Please help.