Stopping Arp poison attacks

["P. Entester" <pentest__ () hotmail com>]

Hello there,

I am not a networking expert, but in my work as a pentester i often use arp 
poison attacks to intercept interesting traffic.
If i recommend our customers to bind the MAC addresses of mission critical 
servers' network interfaces to their respective ports on the routers and 
switches, does that migitate most of the threat or am i missing something 
important?

Thanks in advance for your reply.

Peter.

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