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Re: [NETVAERK] MAC-adresse



Martin Schultz wrote:

On 2/28/06, Erik Jakobsen <sslug@sslug> wrote:


Claus wrote:



Hej SSLUG-NG

Er en MAC-adresse altid den samme? I min firewall-log kan jeg se at
nogle MAC-adresser går igen i forskellige sammenhæng.

Claus



Yes, den er unik for det/de netkort, du har. En mac-adresse for et kort
er det eneste i hele verden, hvis du forstår ?



I teorien er den unik. Der er set kort med samme MAC andresse og de
fleste kort tillader brugeren at ændre MAC adressen.


Men du får nok ikke MAC adressen fra dine brugere i din firewall log. IP pakken pakkes ind i en ethernet pakke (som indeholder MAC adressen), som sendes til næste hop på ruten til din maskine...måske en router. Den tager så IP pakken op af ethernet pakken og putter den i en ny ethernet pakke med dens egen MAC adresse som afsender og en ny MAC adresse som destination. Det gentager sig indtil pakkerne når din maskine, så MAC adressen du ser, er den, som sidste hop på ruten har.
De adresser du ser er sandsynligvis for routere og andre maskiner på samme net.


 
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