vconfig in linux

% vconfig Expecting argc to be 3-5, inclusive. Was: 1 Usage: add [interface-name] [vlan_id] rem [vlan-name] set_flag [interface-name] [flag-num] [0 | 1] set_egress_map [vlan-name] [skb_priority] [vlan_qos] set_ingress_map [vlan-name] [skb_priority] [vlan_qos] set_name_type [name-type] * The [interface-name] is the name of the ethernet card that hosts the VLAN you are talking about. * The vlan_id is the identifier (0-4095) of the VLAN you are operating on. * skb_priority is the priority in the socket buffer (sk_buff). * vlan_qos is the 3 bit priority in the VLAN header * name-type: VLAN_PLUS_VID (vlan0005), VLAN_PLUS_VID_NO_PAD (vlan5), DEV_PLUS_VID (eth0.0005), DEV_PLUS_VID_NO_PAD (eth0.5) * bind-type: PER_DEVICE # Allows vlan 5 on eth0 and eth1 to be unique. PER_KERNEL # Forces vlan 5 to be unique across all devices. * FLAGS: 1 REORDER_HDR When this is set, the VLAN device will move the ethernet header around to make it look exactly like a real ethernet device. This may help programs such as DHCPd which read the raw ethernet packet and make assumptions about the location of bytes. If you don't need it, don't turn it on, because there will be at least a small performance degradation. Default is OFF. ----->  eth0      vlan              8021q   vconfig add eth0 11 vconfig add eth0 21 ----->      REORDER_HDR (    ) vconfig set_flag eth0.11 1 1 vconfig set_flag eth0.21 1 1 ----->      cat /proc/net/vlan/eth0.11 cat /proc/net/vlan/eth0.21 ----->           cd /etc/sysconfig/network-scripts/ cp ifcfg-eth0 ifcfg-eth0.11 perl -pi -e 's/DEVICE=eth0/DEVICE=eth0.11/g' ifcfg-eth0.11 cp ifcfg-eth0 ifcfg-eth0.21 perl -pi -e 's/DEVICE=eth0/DEVICE=eth0.21/g' ifcfg-eth0.21 perl -pi -e 's/IPADDR=/#IPADDR=/g' ifcfg-eth0 perl -pi -e 's/NETMASK=/#NETMASK=/g' ifcfg-eth0 ...... ----->                  ifdown eth0;ifup eth0;ifup eth0.11;ifup eth0.21 ----->            8021q    echo VLAN=yes >> /etc/sysconfig/network