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changing subnetmask on all servers

Discussion in 'General Discussion' started by CoolMike, Jul 12, 2005.

  1. CoolMike

    CoolMike Well-Known Member

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    Hi

    I have to change the subnet mask on all my cpanel servers in a few days. I'm wondering, is it enough if I change the file "/etc/sysconfig/network-scripts/ifcfg-eth0"? Or is there anything else needed? After I made the change there, do I need to restart a service?

    I use Centos 3.5.

    Thanks
    Michael
     
    #1 CoolMike, Jul 12, 2005
  2. CoolMike

    CoolMike Well-Known Member

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    I just realized in this file I have only the main IP adress, what about the second IP which I have configured on this servers? I did expect that there will be also a file ifcfg-eth0:1, but I did not find it.

    Michael
     
    #2 CoolMike, Jul 12, 2005
  3. chirpy

    chirpy Well-Known Member

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    Run ifconfig to check how your IP addresses are bound. After making changes you need to down and up the interface. Remotely, this is best done with:

    /etc/init.d/network restart

    But do be aware that this can render the server inaccessible and may require a manual restart of the network from the console. If you have access to the console remotely, do that restart from there. If not, it might be better to simply reboot.
     
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    #3 chirpy, Jul 12, 2005
  4. CoolMike

    CoolMike Well-Known Member

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    Hi Chirpy

    ipconfig shows this:

    But I have only a /etc/sysconfig/network-scripts/ifcfg-eth0 file and not a second one for eth0:1.

    Where can I change the subnetmask for the second ip address?

    Thanks
    Michael
     
    #4 CoolMike, Jul 12, 2005
  5. chirpy

    chirpy Well-Known Member

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    They're setup by /etc/init.d/ipaliases and take the information from the file /etc/ips which contains, among other things, the network mask information.
     
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    #5 chirpy, Jul 13, 2005
  6. CoolMike

    CoolMike Well-Known Member

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    Thanks a lot, this was exactly what I was looking for.

    Michael
     
    #6 CoolMike, Jul 14, 2005
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