Heloo ppl

Im looking for a way to assign two MAC addresses on a single NIC card simultaneously. Is there ne method out there???
Also wanted to know how to create an alias MAC address to a NIC card w/o overrtiting the builtin MAC address...

Thanks in advance
Cheers

Each NIC has, at any time, only one MAC address.

To give a NIC a different MAC address on the command line, try running:

If you want to do this in a C program:

1. Use the socket(AF_INET,SOCK_DGRAM,0) call to open a socket.

2. Use the SIOCGIFFLAGS ioctl on the socket to get the current flags.

3. Clear the IFF_UP flag in those current flags.

4. Use the SIOCSIFFLAGS ioctl with the changed flags to bring the network card down.

5. Use the SIOCGIFHWADDR ioctl to get the current hardware address.

6. Change the ifr_hwaddr.sa_data bytes (bytes [0] through [5]) to whatever you want.

7. Use the SIOCSIFHWADDR ioctl to set the new hardware address.

8. Use the SIOCSIFFLAGS ioctl to reset the original flags, so that the NIC is now up again.

For help:

Have you looked at this or this?

Hello
This is sort of wat i was looking for.

If i run "ip link show", i get details of 2 interfaces with 2 MAC addresses.
If i run "ifconfig", i get 2 interfaces both with original MAC addresses... Wat does this imply...
Sort of confused..
Hellp pllsssss

Cheers

Could you post what exactly you did and the resulting output.

Hello,
First i tried adding an interface using vconfig
ifconfig doesn show the new virtual nic, but ip link show does... Does this mean i have 2 interfaces running???
Results posted below...

[root@localhost ~]# vconfig add eth0 1
WARNING: Could not open /proc/net/vlan/config. Maybe you need to load the 8021q module, or maybe you are not using PROCFS??
Added VLAN with VID == 1 to IF -:eth0:-
WARNING: VLAN 1 does not work with many switches,
consider another number if you have problems.

[root@localhost ~]# ip link show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 00:13:d3:06:8c:e4 brd ff:ff:ff:ff:ff:ff
3: sit0: <NOARP> mtu 1480 qdisc noop
link/sit 0.0.0.0 brd 0.0.0.0
4: eth0.1@eth0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop
link/ether 00:13:d3:06:8c:e4 brd ff:ff:ff:ff:ff:ff

[root@localhost ~]# ifconfig
eth0 Link encap:Ethernet HWaddr 00:133:06:8C:E4
inet addr:192.168.1.100 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::213:d3ff:fe06:8ce4/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:4443 errors:0 dropped:0 overruns:0 frame:0
TX packets:4027 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:4836786 (4.6 MiB) TX bytes:679436 (663.5 KiB)
Interrupt:209 Base address:0xa000

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:1469 errors:0 dropped:0 overruns:0 frame:0
TX packets:1469 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:2189856 (2.0 MiB) TX bytes:2189856 (2.0 MiB)


[root@localhost ~]# ip link set dev eth0.1 address 00:07:E9:042:9A
[root@localhost ~]# ip link show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 00:13:d3:06:8c:e4 brd ff:ff:ff:ff:ff:ff
3: sit0: <NOARP> mtu 1480 qdisc noop
link/sit 0.0.0.0 brd 0.0.0.0
4: eth0.1@eth0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop
link/ether 00:07:e9:04:d2:9a brd ff:ff:ff:ff:ff:ff

[root@localhost ~]# ifconfig
eth0 Link encap:Ethernet HWaddr 00:133:06:8C:E4
inet addr:192.168.1.100 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::213:d3ff:fe06:8ce4/64 Scope:Link
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:5181 errors:0 dropped:0 overruns:0 frame:0
TX packets:4770 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:5453718 (5.2 MiB) TX bytes:837615 (817.9 KiB)
Interrupt:209 Base address:0xa000

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:1469 errors:0 dropped:0 overruns:0 frame:0
TX packets:1469 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:2189856 (2.0 MiB) TX bytes:2189856 (2.0 MiB)

Thanks

Until you bring your interface up, ifconfig will not show it by default. Try “ifconfig -a” to show all interfaces. Also, make sure to “modprobe 8021q” prior to all this.

Thanks a ton to alll....
It worked... I ran the dhclient program and ifconfig showed the configured interfaces....
thank you alll
Cheers