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HWIC-4ESW having same MAC address with fa0/0 from CISCO2811 router.

Hi Expert, I Have a situation where a 2811 is configured with 2 VLANs from HWIC-4ESW module, different ports configured, however the VLAN interfaces have the same mac-address with fa0/0 which causes ARP poisoning problem. It that anyway to solve this problem?

3 REPLIES

Re: HWIC-4ESW having same MAC address with fa0/0 from CISCO2811

Contact Cisco TAC.

Cisco Employee

Re: HWIC-4ESW having same MAC address with fa0/0 from CISCO2811

Hi Lee,

My understanding is, this is expected behavior and is due to the hardware limitation of the HWIC-4ESW Module. And I think the HWIC-4ESW Module (at least from my lab testing) always takes the MAC Address of the first on board LAN Interface.

Also, I am able to change the MAC Address of the first on board LAN Interface (Ex.Gig0/0) but I cannot change the MAC Address of the VLAN SVI.

I hope it helps.

Regards,

Arul

** Please rate all helpful posts **

New Member

Re: HWIC-4ESW having same MAC address with fa0/0 from CISCO2811

Hi Arul,

Thank's for your reply. Does it mean that no solution to aviod the ARP poisoning issue?

Regards

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