ip masquerade diagram

ip masquerade diagram

Post by annaliss » Sun, 22 Feb 2009 13:40:01



Hi all,

In the IP masquerading diagram given here

  http://www.linux-mag.com/images/1999-08/img2/guru2.jpg

in step 12 , how does the masq server determines , the packet is not for
the linux server but for an internal masqued machine ?

masquerading operation is just SNAT/DNAT operation isn't it ?

 
 
 

ip masquerade diagram

Post by Robert Nichol » Tue, 24 Feb 2009 02:29:53


:Hi all,
:
:In the IP masquerading diagram given here
:
:  http://www.linux-mag.com/images/1999-08/img2/guru2.jpg
:
:in step 12 , how does the masq server determines , the packet is not for
:the linux server but for an internal masqued machine ?
:
:masquerading operation is just SNAT/DNAT operation isn't it ?

Whenever SNAT is set up for a connection, a corresponding DNAT is
automatically set up for the reply traffic.

      SNAT 192.168.0.10:1060 -> 123.123.123.123:64000

   implies

      DNAT 123.123.123.123:64000 -> 192.168.0.10:1060

And yes, there are typos in that linux-mag figure.  There's a missing
"123" address component in the addresses in each of the green boxes.

--
Bob Nichols         AT comcast.net I am "RNichols42"

 
 
 

1. IP for masqueraded net other than masquerading host IP

Hello

I have a linux box which should work as router for two subnets to the internet.
One subnet has valid IP addresses but the other subnet with private IPs has to be masqueraded. Is it possible to masquerade this subnet with an IP address from the other subnet or with the IP of the router port which is connected to the valid subnet and not with the IP address of the router port which is connected to the internet which is the default?

regards
Klaus

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