adding virtual interfaces / ifconfig

[rixonMember]

My ultimate goal is to set my ZeroShell router to pull additional IP addresses via DHCP from my Cable Modem provider to be used by other hosts on a DMZ. I was hoping to set up additional sub-interfaces on my WAN interface and use the clientID parameter to dhcp for each additional lease request.

When trying to do this from the shell by hand, I first create a sub-interface with a random IP:

ifconfig ETH01:00 1.2.3.4 netmask 255.255.255.0
ifconfig ETH01:00 up

In dhclient.conf, I added:

interface “ETH01:00” {
send dhcp-client-identifier “router-ETH01:00”;
}

So now when I run dhclient ETH01:00, I get a few errors and then the virtual interface is gone! Here are the errors:
SIOCSIFFLAGS: Cannot assign requested address
(That one appears twice immediately on execution.)
Bind socket to interface: No such device
(This one appears about 5 seconds later, when it exits.)

Any idea what’s happening here? Also, I can anticipate another problem that will manifest itself when I get this part figured out. When DHCP renews the lease on ETH01, it will kill all the sub-interfaces. Thus, the DHCP lease on the main interface will need to be moved to a subinterface as well.

-Paul

[ppaliasMember]

You will need to check the scripts involved in dhcp functions, as well as a look in the dmesg to see what is wrong.

[rixonMember]

Strange, I thought I replied to this. But…

Where are these scripts at?

dmesg doesn’t give any further information from what I posted in the first message. All I’m getting are the Cannot assign… message and the No such device message from stderr.

[ppaliasMember]

The scripts usually are in

/root/kerbynet.cgi/scripts/

I’ve done some troubleshooting on your problem and my guess is that you cannot get multiple DHCP ip addresses because your subinterfaces use the same mac-address. Take a look in my bridged interface with 2 IPs.

BRIDGE00  Link encap:Ethernet  HWaddr 00:15:E9:DA:38:49

UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

RX packets:20431625 errors:0 dropped:0 overruns:0 frame:0

TX packets:25589030 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:0

RX bytes:2920572699 (2785.2 Mb)  TX bytes:911292642 (869.0 Mb)



BRIDGE00: Link encap:Ethernet  HWaddr 00:15:E9:DA:38:49

inet addr:10.14.149.1  Bcast:10.14.149.63  Mask:255.255.255.192

UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1



BRIDGE00: Link encap:Ethernet  HWaddr 00:15:E9:DA:38:49

inet addr:172.16.0.1  Bcast:172.16.0.255  Mask:255.255.255.0

UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

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