[CentOS] SNAT

David Hláčik david at hlacik.eu
Sun Jan 10 14:34:19 UTC 2010


*** Sorry for mistake

I have configured static route on ADSL modem "10.123.0.0/16 via
> 10.123.10.1" which ensures traffic comming from internet will ge to
> my router

10.123.10.1 is address of eth0 on my router.

On Sun, Jan 10, 2010 at 3:33 PM, David Hláčik <david at hlacik.eu> wrote:
> Hello I will briefly draw the situation
>
> Router with one interface eth0 , to local network 10.123.0.0/16
>
> on a local network ADSL modem with IP  10.123.10.11
>
> I want to use 10.123.10.11 as a connection to internet .
>
> Because of that I have created default route "ip route add default via
> 10.123.10.11 dev eth0"
>
> I do not want my ADSL modem to do NATing , since it shows to be slow.
> I have configured static route on ADSL modem "10.123.0.0/16 via
> 10.123.10.11" which ensures traffic comming from internet will ge to
> my router.
>
> Now i want to configure NATTING. My concern is, how to create iptables
> rule which will match only the traffic going via 10.123.10.11 and only
> for this will make SNAT.
> If I will do iptables -A POSTROUTING -o eth0 --j SNAT --to-source
> 213.194.242.198 this will not work . I need to add there a magic words
> that only traffic going via 10.123.10.11 should be SNATted.
>
> Please help,
>
> Thank you in advance.
>
> David
>


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