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Posted by News Reader on May 1, 2008, 12:05 pm
Patrick Schaaf wrote:
>
>>>> why does an access point have 2 MAC addresses (one WLAN, one LAN)
>>>> while a router has only one even if it has lan ports and wan ports?
>>> The premise is wrong. Where did you get that impression?
>>>
>>> Neither access point nor router 'has' MAC addresses.
No doubt his device has a sticker on it listing MAC addresses with which
it is configured. No doubt, he accesses an administrative interface on
the router using an assigned MAC address. You want to argue whether it
"has" MAC Addresses?
Do you really think your response was helpful to this individual, basing
it on some esoteric example, and leaving him with no explanation to
gauge your response?
>
>> Where did "you" get that impression?
>
> By noticing that such addresses are stored in EEPROM for software
> to read out, but the it's totally up to the software which address
> is in each an every frame.
>
>> If a router interface didn't have a MAC address, how do you think you
>> would communicate with it?
>
> I send it a frame. When it replies somehow, I communicated. In principle
> the router software could just accept all incoming frames (called
> promiscous mode, usually) and operate on them regardless of their
> source or destination MAC addresses. A packet sniffer does that.
>
>> When your host sent this post, it forwarded its "framed" packets to the
>> default gateway's MAC address.
>
> I know how IP works, thank you. I'm not at all talking about IP here.
When you don't explain the basis for your statement, how are we to gauge
your knowledge?
>
>> Even switches have a different MAC address for each port, as they are
>> the "source" of some protocol traffic. Look at STP packets sent on each
>> port with a sniffer.
>
> I know.
>
> best regards
> Patrick
Best Regards,
News Reader
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