Differences between version 7 and predecessor to the previous major change of MACAddress.
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| Newer page: | version 7 | Last edited on Tuesday, October 12, 2004 10:40:58 am | by SamJansen | Revert |
| Older page: | version 3 | Last edited on Tuesday, October 12, 2004 10:18:55 am | by StuartYeates | Revert |
@@ -1,5 +1,18 @@
The hardware address of an [Ethernet] card. These are 6 bytes long (eg: 00:00:0C:1A:4B:C3).
You have to 'reserve' part of the [MAC] address space when you make a network card, so everyone has a unique address. Since everyone's network card is unique, this is often used as a unique identifier for a machine (even though a machine may have multiple network cards, or not have one at all).
-The
[MAC] in a [TCP/IP
] header is a combination of
the two
[MACAddress]es involved in a connection
and the
[Protocol].
+An
[Ethernet
] packet
header contains
the source and destination [Ethernet]
[MACAddress]es and a
[Protocol] (or Length) field
.
+
+You can find out the [MACAddress] of your network cards using the ifconfig(8) utility. For example in Linux:
+ ~$ /sbin/ifconfig
+ eth0 Link encap:Ethernet HWaddr __00:07:A9:11:40:A8__
+ ...
+
+It may look different in other [Unix] variants, [OpenBSD] shows the following:
+ $ /sbin/ifconfig -a
+ rl0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
+ address: __00:05:1d:9b:f1:10__
+
+----
+CategoryNetworking
