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change NIC configuration to make new VLAN tag take effect

April 2nd, 2015

Sometimes you may want to add vlan tag to existing NIC, and after the addition, you'll need to change DNS names bound to the old tag with new IPs in the newly added vlan tag. After all these two steps done, you'll need to make changes on the hosts(take linux for example) to make these changes into effect.

In this example, I'm going to move the old v118_FE to the new VLAN v117_FE.

ifconfig v118_FE down
ifconfig bond0.118 down
cd /etc/sysconfig/network-scripts
mv ifcfg-bond0.118 ifcfg-bond0.117
vi ifcfg-bond0.117
    DEVICE=bond0.117
    BOOTPROTO=none
    USERCTL=no
    ONBOOT=yes
    BRIDGE=v117_FE
    VLAN=yes
mv ifcfg-v118_FE ifcfg-v117_FE
vi ifcfg-v117_FE
    DEVICE=v117_FE
    BOOTPROTO=none
    USERCTL=no
    ONBOOT=yes
    STP=off
    TYPE=Bridge
    IPADDR=10.119.236.13
    NETMASK=255.255.248.0
    NETWORK=10.119.232.0
    BROADCAST=10.119.239.255
ifup v117_FE
ifup bond0.117
reboot
Good Luck!


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