URGENT!!: FC2 doesn't take IP address from command line, only GUI(Network Window).

[damoose]

Hi there,

I SSH to our servers remotely and want to change the IP address of the server on the fly.

Current IP config:

Server 1.
eth0 10.2.3.3 netmask 255.255.255.0 broadcast 10.2.3.255

alias:
eth0:0 10.2.3.33 netmask 255.255.255.0 broadcast 10.2.3.255


Server 2.
eth0 10.2.3.4 netmask 255.255.255.0 broadcast 10.2.3.255

alias:
eth0:0 10.2.3.44 netmask 255.255.255.0 broadcast 10.2.3.255

I SSH to the alias of Server 2, and want to change the actual IP, 10.2.3.4, to 10.2.3.5

So I typed:

ifconfig eth0 10.2.3.3 netmask 255.255.255.0 broadcast 10.2.3.255 [enter]

Lost connection.


So when I was there locally, I logged in to the console, and saw it accepted the IP able to ping other host on the same network. Not if I try to SSH from Public (remote VPN client, and VPN connection from firewalls).

But when I restarted the network service (/etc/init.d/network restart) it goes BACK to the IP address that I entered in on the Network GUI interface (Hat -> System Configurations -> Network -> eth0 -> Edit).

We tried editing /etc/rc.d/rc.local file by putting the IP there, eth1, eth2, disable eth0 and .... nothing!!.

It will only accept PERMANENTLY when I make the change in Network GUI interface -> Activate -> restart the network interface. AND only will I then be able to connnect to it via SSH from public side.

Please Help Me! I am desperate here! Thank you!

[hiberphoptik]

using those commands it will never keep the settings after a restart, if you wnt to change them yuo can edit the scripts in /etc/sysconfig/network-scripts/

[marko]

Originally Posted by damoose

Hi there,
...........
So when I was there locally, I logged in to the console, and saw it accepted the IP able to ping other host on the same network. Not if I try to SSH from Public (remote VPN client, and VPN connection from firewalls).

But when I restarted the network service (/etc/init.d/network restart) it goes BACK to the IP address that I entered in on the Network GUI interface (Hat -> System Configurations -> Network -> eth0 -> Edit).

We tried editing /etc/rc.d/rc.local file by putting the IP there, eth1, eth2, disable eth0 and .... nothing!!.

It will only accept PERMANENTLY when I make the change in Network GUI interface -> Activate -> restart the network interface. AND only will I then be able to connnect to it via SSH from public side.

Please Help Me! I am desperate here! Thank you!

/etc/init.d/network restart gets the addresses and network info it
needs from the files
/etc/sysconfig/network and /etc/sysconfig/network-scripts/ifcfg-*

That's why doing the restart reverts you back to the settings you put in
via the gui. I'm not totally sure what you want to do but you can quickly
change the addresses on a interface via a console

ifconfig eth0 IPADDRESS

like:
ifconfig eth0 192.168.1.200

but like you found these are one-shot settings, the next reboot or
network restart they are gone and revert back to your original settings.
If you want these to be permanent, you can edit
the /etc/sysconfig/network-scripts/ifcfg-eth? file(s)

Mark

[damoose]

Thanks for the suggestions Mark. I'll try that.

The reason I'm doing this way is actually to replace the role of Server 1(MAIN) with Server 2(BACKUP).

So if Server 1(MAIN) is down (10.2.3.3), then I will simply SSH to Server 2 IP alias(10.2.3.44) and make its actual IP to be the MAIN server.

Will I lose connection this way, though I'm connecting through the IP alias?..

further explanation:
Reading at your suggestion on editing the /etc/sysconfig/network-scripts/ifcfg-eth? file(s) -->>
If I edit ifcfg-eth0 file of the BACKUP server to be the IP of the MAIN server will I lose my SSH connection since I'm connecting through the BACKUP server IP alias ?..

Thank you guys.

[damoose]

What Mark suggested is working!.
I edited the /etc/sysconfig/network-scripts/ifcfg-eth0 file , changed the

IPADDR=10.2.3.3 (AFTER the change).

save, and restart network service --> /etc/init.d/network restart

Voila it accepted the actual IP. HOWEVER, I lost connection since I logged in through the IP alias.
I configured the IP alias by typing it manually on command line:

ifconfig eth0:0 10.2.3.88 netmask 255.255.255.0 broadcast 10.2.3.255

and I entered it in /etc/rc.d/rc.local file. This way when I reboot it will still keep the IP alias.

So my next question is, is there anyway to KEEP the IP ALIAS configuration without rebooting?..

Is there a "hard code" parameter in /etc/sysconfig/network-scripts/ifcfg-eth0 file ? Maybe something like IPADDR-ALIAS or something.

I noticed there's a file call etc/sysconfig/network-scripts/ifup-aliases. Could I edit something in there so I don't need to reboot the server in order for me to login via IP ALIAS address?