IFCFG shows duplicate interfaces

Hi,
I am using the Linux 2.4.19 kernel and have build the VLAN with the
kernel compilation. I am trying to add the VLANs using the vconfig then
using the ifconfig assigning the IP. Let's assume I created the
following vlans on eth1

VLAN11: id=11 IP=11.11.11.11 Netmask:255.255.255.0


VLAN12: id=12 IP=12.12.12.12 Netmask:255.255.255.0

Now if I use the ifconfig all the interfaces are displayed correctly

In next step I am creating the VLAN 10:

VLAN10: id=10 IP=10.10.10.10 Netmask:255.255.255.0
VLAN100: id=100 IP=100.100.100.100 Netmask:255.255.255.0


Now when I use the ifconfig all the interfaces are being displayed
twice, it is starnge. Same time if I use ip addr command it shows only
one entry. I tried ip addr add to assign the IPs instead of ifconfig
but same result.


Am I doing something wrong here ? Can someone help me to understand it
better if I might be doing something wrong ?


Thanks,
Ashok