MAC addresses in router vs Access Point
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Posted by Ale on May 1, 2008, 5:19 am
Please log in for more thread options while a router has only one even if it has lan ports and wan ports? thanks! | |||||||||||||||||||||||||||||||||||||||||||
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Posted by Patrick Schaaf on May 1, 2008, 11:11 am
Please log in for more thread options The premise is wrong. Where did you get that impression? Neither access point nor router 'has' MAC addresses. It's ethernet frames that have MAC addresses, two each, one indicating a source, and one indicating a destination. Several frames coming out of some ethernet port can have different destination MAC addresses, and even different source MAC addresses, e.g. when the port is a port of a bridge device. best regards Patrick | |||||||||||||||||||||||||||||||||||||||||||
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Posted by News Reader on May 1, 2008, 11:38 am
Please log in for more thread options 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. It's ethernet frames Where did "you" get that impression? If a router interface didn't have a MAC address, how do you think you would communicate with it? When your host sent this post, it forwarded its "framed" packets to the default gateway's MAC address. As the "framed" packets traverse the Internet on their way to the NNTP server, the source and destination MAC addresses in the frames changed hop-by-hop to reflect the MAC addresses of the routers involved at each hop. Only the source and destination IP addresses remained the same. > that have MAC addresses, two each, one indicating a source, and one indicating
> a destination. Several frames coming out of some ethernet port can have > different destination MAC addresses, and even different source MAC addresses, > e.g. when the port is a port of a bridge device. 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. >
> best regards > Patrick Best Regards, News Reader | |||||||||||||||||||||||||||||||||||||||||||
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Posted by Patrick Schaaf on May 1, 2008, 11:44 am
Please log in for more thread options
>>> 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. >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. >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 | |||||||||||||||||||||||||||||||||||||||||||
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Posted by News Reader on May 1, 2008, 12:05 pm
Please log in for more thread options 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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>while a router has only one even if it has lan ports and wan ports?