you were getting traffic even after unplugging your LAN from the gateway
right?

so either the gateway is originating the traffic - or someone is
proxying traffic through the gateway

do a few netstats to see what this is, and also try using netflow, ntop
etc ..

Shijithlal wrote:
>    Origin of the packets are from the gateway system itself and
> probably the source IP address of the packets are same as the ip
> address of the gateway. Then how can I block these packets ? And I
> need to allow the users to use all type of application and it is verry
> difficult to craete a list of port numbers which are using currently.
> 



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