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author | wpaul <wpaul@FreeBSD.org> | 2000-06-16 20:14:43 +0000 |
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committer | wpaul <wpaul@FreeBSD.org> | 2000-06-16 20:14:43 +0000 |
commit | 82e4a377a336192df9c5242f53d08e055da24e00 (patch) | |
tree | f225e48869329753bc302bb25eb70daa24458634 /sbin/ifconfig/ifconfig.8 | |
parent | f0880172c7dc6b2cfe0fe129d1d11ea81b53a287 (diff) | |
download | FreeBSD-src-82e4a377a336192df9c5242f53d08e055da24e00.zip FreeBSD-src-82e4a377a336192df9c5242f53d08e055da24e00.tar.gz |
Implement SIOCSIFLLADDR, which allows you to change the link-level
address on an interface. This basically allows you to do what my
little setmac module/utility does via ifconfig. This involves the
following changes:
socket.h: define SIOCSIFLLADDR
if.c: add support for SIOCSIFLLADDR, which resets the values in
the arpcom struct and sockaddr_dl for the specified interface.
Note that if the interface is already up, we need to down/up
it in order to program the underlying hardware's receive filter.
ifconfig.c: add lladdr command
ifconfig.8: document lladdr command
You can now force the MAC address on any ethernet interface to be
whatever you want. (The change is not sticky across reboots of course:
we don't actually reprogram the EEPROM or anything.) Actually, you
can reprogram the MAC address on other kinds of interfaces too; this
shouldn't be ethernet-specific (though at the moment it's limited to
6 bytes of address data).
Nobody ran up to me and said "this is the politically correct way to
do this!" so I don't want to hear any complaints from people who think
I could have done it more elegantly. Consider yourselves lucky I didn't
do it by having ifconfig tread all over /dev/kmem.
Diffstat (limited to 'sbin/ifconfig/ifconfig.8')
-rw-r--r-- | sbin/ifconfig/ifconfig.8 | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/sbin/ifconfig/ifconfig.8 b/sbin/ifconfig/ifconfig.8 index cd0c6c6..e564010 100644 --- a/sbin/ifconfig/ifconfig.8 +++ b/sbin/ifconfig/ifconfig.8 @@ -189,6 +189,16 @@ This action does not automatically disable routes using the interface. .\" IP encapsulation of .\" .Tn CLNP .\" packets is done differently. +.It Cm lladdr Ar addr +Set the link-level address on an interface. This can be used to +e.g. set a new MAC address on an ethernet interface, though the +mechanism used is not ethernet-specific. The address +.Ar addr +is specified as a series of colon-separated hex digits. +If the interface is already +up when this option is used, it will be briefly brought down and +then brought back up again in order to insure that the receive +filter in the underlying ethernet hardware is properly reprogrammed. .It Cm media Ar type If the driver supports the media selection system, set the media type of the interface to |