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Using an access list on a Cisco Device which has an interface configured for dhcp April 29, 2008

Posted by daakeung in Cisco.
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Came across this one today at work, while securing one of my routers,

If you intent to secure your cisco device using an access-list on the wan interface, but still need the wan interface to receive a dhcp address.

You accesslist should look something like this:

permit udp any eq bootps any eq bootpc
permit udp any eq bootps any eq bootps
deny ip any any

Always end your wan port access-list by locking everything else off.

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