(question) same MACs in wireless router
Ori Idan
ori-RdxWQVHs3mjDN57Tih+YPw at public.gmane.org
Sun Sep 9 06:22:49 UTC 2012
On Sat, Sep 8, 2012 at 9:57 PM, James Knott <james.knott-bJEeYj9oJeDQT0dZR+AlfA at public.gmane.org> wrote:
> William Park wrote:
>
>> I thought they all have to be different.
>>
>
> MACs only have to be different on the local LAN. WiFi and Ethernet are
> two separate LANs bridged by the access point. Those MACs are also the
> same device, so there's no possibility of sending data to the wrong box. I
> just checked my TP-Link WA-901ND access point and it also shows the same
> MAC for both WiFi and LAN sides.
>
> Just a reminder for those who may have forgotten or never knew. It is the
> MAC address that's used to carry traffic around the local LAN, not the IP
> address. When a computer has to send data to another device on the local
> LAN, it looks up the MAC address for that IP address and then uses it to
> send the data. The destination receives frames for it's MAC address and
> then verifies the IP address if needed. When you send to a router, for
> forwarding elsewhere, the destination IP address is never the router's
> address.
>
>
> I know that MAC address must be different at the local network only,
however most of my customers manufacturing communication equipment always
set a different MAC address for different interfaces.
--
Ori Idan
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