How to change en0 MAC address ?
/how to do it from command line
and in c/c++ program ?
Q <no@spam.pl> wrote:
How to change en0 MAC address ?
/how to do it from command line
From command line:
ifconfig en0 10.0.0.1
and in c/c++ program ?
system(“ifconfig en0 10.0.0.1”);
is the easiest.
spawnl(P_WAIT, “ifconfig”, “ifconfig”, “en0”, “10.0.0.1”, NULL );
is a it more efficient.
It can probably be done through a set of other operations, since
ifconfig is implemented in C, but I don’t know what they are.
-David
David Gibbs
QNX Training Services
dagibbs@qnx.com
David Gibbs <dagibbs@qnx.com> wrote:
Q <> no@spam.pl> > wrote:
How to change en0 MAC address ?/how to do it from command line
From command line:
ifconfig en0 10.0.0.1
He asked about MAC address, not IP address.
On Mon, Aug 28, 2006 at 08:27:03AM +0200, Q wrote:
How to change en0 MAC address ?
/how to do it from command line
and in c/c++ program ?
I believe you can only do it from the command line when you mount/load
the driver. The devn drivers have a mac=xxxxxxxxxxxx option.
Once it’s running there is no changing the MAC address (apart from
un-mounting the driver and then remounting with a different MAC).
Regards,
Gilles
Once it’s running there is no changing the MAC address (apart from
un-mounting the driver and then remounting with a different MAC).
I anticipate that 
I write script to change MAC
and its a pity that there is not other way to do it .
chmac 0 001122334455
chmac {
umount /dev/io-net/en$1
mount -v -Tio-net -v -o mac=$2,pci=$1 /lib/dll/devn-pcnet.so
}
ifconfig en0 10.0.0.1
I didn’t ask for that…
system(“ifconfig en0 10.0.0.1”);
spawnl(P_WAIT, “ifconfig”, “ifconfig”, “en0”, “10.0.0.1”, NULL );
…but this will be useful for me, in future 
“Q” <no@spam.pl> wrote in message news:ed3anq$bf6$1@inn.qnx.com…
Once it’s running there is no changing the MAC address (apart from
un-mounting the driver and then remounting with a different MAC).I anticipate that >
I write script to change MAC
and its a pity that there is not other way to do it >
How simpler could it be? Even if you can skip the unmout process,
internally everything has to go through some reinitialisation. It’s easy to
imagine that changing a MAC address in the middle of a network transaction
can be tricky to handle…
chmac 0 001122334455
chmac {
umount /dev/io-net/en$1
mount -v -Tio-net -v -o mac=$2,pci=$1 /lib/dll/devn-pcnet.so
}
Frank Liu <fliu@usdjmp1.eng.vodafone-us.com> wrote:
David Gibbs <> dagibbs@qnx.com> > wrote:
Q <> no@spam.pl> > wrote:
How to change en0 MAC address ?/how to do it from command line
From command line:
ifconfig en0 10.0.0.1
He asked about MAC address, not IP address.
Oh, right. Oops.
Um… generally that comes from the hardware, which has a little
chip on it that gives the MAC address.
Some ethernet chips have the ability to “tell” them a MAC address
when they are initialized, though not all have that ability.
For those drivers that have this capability, it will be a “mac=XXXXXXXXXXX”
when the driver is launched, either from the io-net command line, or
when the mount command is issued to load the driver.
I know of no way to change it after en0 exists, that is after the driver
has initialized. (Well, kill off io-net, relaunch with different driver
options – but no re-config method.)
-David
David Gibbs
QNX Training Services
dagibbs@qnx.com