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Cisco 831

I am using Cisco 831 at many smaller remote offices with DHCP. What is the best way to both monitor and control access on the 4 fastethernet ports. Is there a way to secure all of the ports with a MAC address security, etc so only certain machines will be able to gain network and internet access via the router?

Thanks - any help would be appreciated.

Jamie

2 REPLIES

Re: Cisco 831

Hello Jamie,

the 831 does not support port-security on the FastEthernet ports. There is however a workaround you could use, if you have a limited number of know MAC addresses that you want to block. Basically, what you do is use the command:

arp {ip-address | vrf vrf-name} hardware-address encap-type [interface-type]

to manually blackhole MAC addresses by sending them to a Loopback or Null interface. Let's say you want to deny IP address 192.168.1.10 with MAC address 00ed.3456.7896, the entry would be:

arp 192.168.1.10 00ed.3456.7896 arpa Loopback0

This would effectively send all traffic for that IP and MAC address to the Loopback interface...

HTH,

GNT

Community Member

Re: Cisco 831

What if I just wanted to allow 4 mac addresses access, would I just use the inverse?

Thanks

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