3 Comment(s)

1. vancevancerevolution | Dec 2, 2010 | Reply

   Try “man ifconfig”.

2. sexylittlemisstweetybird83 | Dec 2, 2010 | Reply

   This is a quick guide on adding IPs to a system manually. I would only suggest it if you are not using a control panel, such as cpanel, that has a feature to adds ips. If your main ethernet device is eth1 instead of eth0 simply substitute eth1 for eth0. Other then that should be pretty simple to follow, this should work on any standard redhat/centos based system.

   Login as root then do the following to add a new ip address to any linux redhat based system. If you have cpanel there is a nice little ip management script that just lets you do it via WHM. For those without cpanel do the following:

   cd /etc/sysconfig/network-scripts

   Then as a usual precaution I would make a backup of the file
   cp ifcfg-eth0 ifcfg-eth0.bak
   (you wont need to do anything with the backup)

   Then copy the config for your new IP
   cp ifcfg-eth0 ifcfg-eth0:1

   Then we need to edit the new config
   pico -w ifcfg-eth0:1

   The lines you need to change:

   DEVICE=”eth0″
   to
   DEVICE=”eth0:1″

   Then change the
   IPADDR=”xxx.xxx.xxx.xxx”
   to be your NEW ip address (it will have your primary ip listed)

   Once this is done, press CTRL + X
   then press Y and

   This will have saved the config for you and the interface is ready to be brought up. This is done with
   /sbin/ifup eth0:1

   Having done this if you type
   /sbin/ifconfig

   You should see something like
   ——code——
   eth0 Link encap:Ethernet HWaddr 00:00:00:00:00:00
   inet addr:xxx.xxx.xxx.xxx Bcast:xxx.xxx.xxx.xxx Mask:255.255.254.0
   UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
   RX packets:55818546 errors:0 dropped:0 overruns:0 frame:0
   TX packets:46167836 errors:0 dropped:0 overruns:0 carrier:0
   collisions:0 txqueuelen:100
   RX bytes:3299680715 (3146.8 Mb) TX bytes:1890963825 (1803.3 Mb)
   Interrupt:11 Base address:0xd000

   eth0:1 Link encap:Ethernet HWaddr 00:00:00:00:00:00
   inet addr:NEW.IP.ADDRESS Bcast:xxx.xxx.xxx.xxx Mask:255.255.254.0
   UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
   Interrupt:11 Base address:0xd000

   lo Link encap:Local Loopback
   inet addr:127.0.0.1 Mask:255.0.0.0
   UP LOOPBACK RUNNING MTU:16436 Metric:1
   RX packets:241244 errors:0 dropped:0 overruns:0 frame:0
   TX packets:241244 errors:0 dropped:0 overruns:0 carrier:0
   collisions:0 txqueuelen:0
   RX bytes:66571100 (63.4 Mb) TX bytes:66571100 (63.4 Mb)
   ——/code——

   If you then try to ping your new ip it should all work fine
   This should also restart eth0:1 on a reboot as its a direct copy of the eth0 config. So checking for the ONBOOT=”yes” in ifcfg-eth0:1 will ensure it DOES come back up on a reboot

3. jlacroix1758 | Dec 2, 2010 | Reply

   Just so long as your ISP has given you an IP try these,

   http://www.portlock.com/products/storagemanager/Manually_Setting_up_TCP.pdf

   http://www.cae.wisc.edu/site/public/?title=linconftcpip

   Have fun but be safe.

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