Re: mark feature not working as expected

[Sudheer Divakaran <sudheer@svw.com>]

Hi Everybody,
    Sorry, When I composed the mail, I gave wrong network card info. 
Actually the cards are eth0, eth1, eth2 respectively. Here is the 
corrected email.

Thanks,
Sudheer

   



Sudheer Divakaran wrote:

> Hi,
>    I'm facing a problem with MARK target.
> My Linux box has 3 network cards
>
>    eth0 - LAN1
>    eth1 - LAN2
>    eth2 - ISP
>
> My problem is that my Lan machines are not able to communicate with 
> each other  (i.e. LAN1 <-> LAN2).  Firewall blocks them.  But my lan 
> clients have no problem in accessing internet!!.
>
> Here is my configuration.
>
>
> # eth0 - LAN1
> # eth1 - LAN2
> # eth2 - ISP
>
> iptables -F
> iptables -X
> iptables -P INPUT   DROP
> iptables -P OUTPUT  DROP
> iptables -P FORWARD DROP
>
> iptables -t nat -A PREROUTING -i eth0 -o eth1 -j MARK --set-mark 1  
> #THIS IS NOT WORKING
> iptables -t nat -A PREROUTING -i eth1 -o eth0 -j MARK --set-mark 1  
> #THIS IS NOT WORKING
>
> #Other rules follows... Not listed here
>
> iptables -A FORWARD -m mark --mark 1 -j ACCEPT   #THIS IS NOT WORKING
>
> #Other rules follows... Not listed here
>
>
> I know that I can do it directly from the FORWARD chain of filter 
> table, but I'm using SQUID for transparent proxying for some machines 
> (Those rules are not listed here), so I want to mark some packets. 
> Could someone please help me on this?
>
>
> Thanks
> Sudheer
>  
>