SNAT or SAME logging

SNAT or SAME logging

[Wennie V. Lagmay]

Hi all,

Im using Iptables (SAME) to translate my private IP address to Public IP 
address, I just want to know how can I monitor and log which Public IP 
address is used by a specific private IP address.

Example:

-A POSTROUTING -s 192.168.10.0/255.255.255.0 -j SAME --nodst --to 
212.xxx.xxx.113-212.xxx.xxx.114
-A POSTROUTING -s 192.168.11.0/255.255.255.0 -j SAME --nodst --to 
212.xxx.xxx.115-212.xxx.xxx.116

On the example above private IP block 192.168.10.0/24  was map to used 
212.xxx.xxx.113  to 212.xxx.xxx.114. How can I idenfify lets say 
192.168.10.10/24 is using xxx.113 or xxx.114 at any given time.



Thank you very much,



Wennie

Re: SNAT or SAME logging

[Jason Opperisano]

On Thu, Jun 23, 2005 at 08:13:43AM +0300, Wennie V. Lagmay wrote:
> Hi all,
> 
> Im using Iptables (SAME) to translate my private IP address to Public IP 
> address, I just want to know how can I monitor and log which Public IP 
> address is used by a specific private IP address.
> 
> Example:
> 
> -A POSTROUTING -s 192.168.10.0/255.255.255.0 -j SAME --nodst --to 
> 212.xxx.xxx.113-212.xxx.xxx.114
> -A POSTROUTING -s 192.168.11.0/255.255.255.0 -j SAME --nodst --to 
> 212.xxx.xxx.115-212.xxx.xxx.116
> 
> On the example above private IP block 192.168.10.0/24  was map to used 
> 212.xxx.xxx.113  to 212.xxx.xxx.114. How can I idenfify lets say 
> 192.168.10.10/24 is using xxx.113 or xxx.114 at any given time.

  grep $SRCIP /proc/net/ip_conntrack

the last dst= is the SNAT IP.

-j

--
"Stewie: What the hell is this?
 Lois: Stewie that's tuna salad.
 Stewie: Really? I could have sworn it was cat food."
        --Family Guy

Re: SNAT or SAME logging

[Wennie V. Lagmay]

Hi Jason,

Is there a way to log it for sucurity reasons.

Thanks,

Wennie


----- Original Message -----
From: "Jason Opperisano" <opie@817west.com>
To: <netfilter@lists.netfilter.org>
Sent: Thursday, June 23, 2005 5:20 PM
Subject: Re: SNAT or SAME logging


> On Thu, Jun 23, 2005 at 08:13:43AM +0300, Wennie V. Lagmay wrote:
> > Hi all,
> >
> > Im using Iptables (SAME) to translate my private IP address to Public IP
> > address, I just want to know how can I monitor and log which Public IP
> > address is used by a specific private IP address.
> >
> > Example:
> >
> > -A POSTROUTING -s 192.168.10.0/255.255.255.0 -j SAME --nodst --to
> > 212.xxx.xxx.113-212.xxx.xxx.114
> > -A POSTROUTING -s 192.168.11.0/255.255.255.0 -j SAME --nodst --to
> > 212.xxx.xxx.115-212.xxx.xxx.116
> >
> > On the example above private IP block 192.168.10.0/24  was map to used
> > 212.xxx.xxx.113  to 212.xxx.xxx.114. How can I idenfify lets say
> > 192.168.10.10/24 is using xxx.113 or xxx.114 at any given time.
>
>   grep $SRCIP /proc/net/ip_conntrack
>
> the last dst= is the SNAT IP.
>
> -j
>
> --
> "Stewie: What the hell is this?
>  Lois: Stewie that's tuna salad.
>  Stewie: Really? I could have sworn it was cat food."
>         --Family Guy
>
>