Iptables only on specified interface

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Hi,

I have a server with 1G NIC for management (with public ip) and 10G
NIC for data transfers on internal network. When i apply iptables (i
simply restrict ssh for few networks, no fancy stuff) on external
NIC and allow the 10GE nic, it seems that system still does some
sort of processing.

I am using CentOS 5.3. Without any of the iptables applied i can get
the line rate on 10GE without any trouble with stable cpu usage.

Any thoughts ?

Thanks
-Azher
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