On Sun, 24 Nov 2002, Rikard Bostrom wrote:

> Hi,
> 
> I was wondering if anyone could try to give me a good explaination
> on the differences between NAT and MASQUERADING?
> Good sides, bad sides etc...

The main difference is that MASQUERADE shows all outbound connections as 
coming from the same place.  Ie, no matter which system, behind the 
firewall, initiates a connection, the rest of the world sees it as if it 
came from the firewall.

NAT is a two part deal.  The part that compares to MASQ is SNAT...Source 
Network Address Translation.

If you have been granted multiple external addresses by your ISP, you can 
set up the firewall to NAT one of those external addresses to a particular 
internal system.  Ie, xxx.xxx.xxx.1 could be the firewall's main IP, 
xxx.xxx.xxx.xx2 could be an additional IP.  You can set up a NAT rule that 
shows all connections from internal address yyy.yyy.yyy.yyy to appear, to 
the world, as xxx.xxx.xxx.2.

-- 
Mike Burger
http://www.bubbanfriends.org

Visit the Dog Pound II BBS
telnet://dogpound2.citadel.org or http://dogpound2.citadel.org:2000



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