need to change ip addrerss's quick!

hi all i just got an email from my host saying i need to change my ip's on my server (ubuntu 7) but he suggested i simply add the new ones so i can make sure they work then remove the old ones but in isp config i can only have 1 main ip and 1 sub net so how do i go about doing this? also how do i change the dns ips?


p.s. i was asked to change the main ip address (with the 4 others totaling 5), gateway, subnet mask and 2 dns ip's

 

thanks for the amazingly fast reply BUT i have to change all ip's including the main ip so how would i do this? also what about the dns ips?

 

but this isn't just for the websites and dns records this is the servers main ip's and if i get it wrong i've messed up my server

 

yeah but like i said if i get it wrong somehow then my server will be unreachable

 

If I am not mistaken you are worried about settings in your /etc/network/interfaces

In this case just do:

Code:

vi /etc/network/interfaces

and correct your settings there. Either you can just change your settings or you can add second IP to it (see eth0:1 - that is another IP added to the server)

Code:

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
        address xxx.xxx.xxx.xxx
        netmask 255.255.255.128
        network xxx.xxx.xxx.yyy
        broadcast xxx.xxx.xxx.zzz
        gateway xxx.xxx.xxx.www
        # dns-* options are implemented by the resolvconf package, if installed
        dns-nameservers aaa.aaa.aaa.aaa
        post-up ethtool -K eth0 tx off

auto eth0:1
iface eth0:1 inet static
        address xxx.xxx.xxx.vvv
        netmask 255.255.255.128
        network xxx.xxx.xxx.yyy
        broadcast xxx.xxx.xxx.zzz
        gateway xxx.xxx.xxx.www

!!!IMPORTANT!!!
You should have in mind that if you have a router the settings in etc/network/interfaces will be settings of your router, in this case you need to change settings on your router not on the server!

Furthermore you will have to change all settings in ISPConfig as described above:
1. Set new main IP in Management=> Server => Settings
2. Add further IP addresses at the same place
3. Correct all domains and
4. Correct all DNS records.

You can do it in ISPConfig by clicking and rewriting or you can download your database from PHPMyAdmin (dump database) fix it on your comp in spreadsheet and import fixed database back.

Hope that helps