Hoang-
If you are connecting to the internet using those addresses you are already using hide NAT to hide those addresses behind a valid IP address most likely the external interface of you firewall. This must be true because 192.168.#.# is a reserved address so internet routers will not route it. RFC 1918 sets aside a block of class a, b & c address for private use. If you subnet these even further this is fine. This can be useful. You might decide to setup a VPN to one of your clients, remote office, etc. If the are using 192.168.2.0/24(255.255.255.0) and you are using 192.168.0.0/16(255.255.0.0)you will run into problems because their network is a subset of yours. If you change your mask to 24 bits (255.255.255.0) your network address would be 192.168.1.0 and the 2 networks don't overlap.
As long as the firewall and the hosts are configured with the same mask you should be fine.
Hope this helps
-PaulK
*********************************************
Paul Keser
Network Security Engineer
[EMAIL PROTECTED]
tel: 415.351.4037
fax: 415.474.6017
ShopExpert.com
1375 Sutter Street, Suite 400
San Francisco, CA 94109
*********************************************
> -----Original Message-----
> From: Hoang [mailto:[EMAIL PROTECTED]]
> Sent: Tuesday, June 20, 2000 2:35 PM
> To: [EMAIL PROTECTED]
> Subject: [FW1] netmask question
>
>
>
> > My current FW internal interface has an ip of 192.168.1.2
> with a mask of
> > 255.255.0.0. I would like to change all netmask on my
> internal network to
> > 255.255.255.0. Would that cause any kind of trouble on Internet
> activities
> > (or anything at all). Eventually after the change on my
> internal network,
> I
> > will change the FW internal interface's mask to
> 255.255.255.0 to match.
> >
> > Thanks for response.
> >
>
>
>
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