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?

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
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.... This is why there are separate MAC addresses
for ethernet and wireless, they are physically
different networks. In the case of the WAN/LAN, both
are ethernet-type networks but are physically
distinct (this is the purpose of a router like the
AEBS), so having the same MAC address on both sides
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HWIC-4ESW having same MAC address with fa0/0 from CISCO2811 router.

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