(question) same MACs in wireless router

Sat Sep 8 15:54:08 UTC 2012

I just bought a dual-band wireless router (TP-LINK TL-WDR4300).  It has
4 MACs:
    - LAN
    - WAN
    - 2.4GHz Wireless
    - 5GHz Wireless
But, MAC for LAN and 5GHz Wirelss are the same.  Is this normal?
I thought they all have to be different.
-- 
William
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