topic Re: Changing the hostname,ip in Operating System - Linux

Changing the hostname,ip

Manuel Carbajal — Fri, 21 Mar 2003 10:16:54 GMT

Hi,

i have two machines that i would like to swap their hostnames and ip, what consideration do i have to know, which is the best way to do this?

Thanks in advance,

Regards,

Re: Changing the hostname,ip

Paul R. Dittrich — Fri, 21 Mar 2003 12:49:31 GMT

Do a "man hostname" and a "man ifconfig" for the command line details.
Either pick a 3rd (unused) hostname and ip to "park" the first system while you change the second, or take them off the network until you are done with the swap.

HTH,
Paul

Re: Changing the hostname,ip

Balaji N — Fri, 21 Mar 2003 13:20:06 GMT

hi,
shutdown or pull one machine out of the network. if that is not possible, use a temporary host name and ip for it.

change host / ip for the other machine.

change host / ip for the first machine.

dont forget to update the host files and dns server for these entries if u have any. also, be aware of this change and as these might reflect in the logs as well. do u run any specific applications, firewall, etc. take care of them.

hth
-balaji

Re: Changing the hostname,ip

Steven E. Protter — Fri, 21 Mar 2003 19:24:09 GMT

Machine 1

ifconfig eth0 (replace zero with actual value) down

Machine 2

ifconfig eth0 (replace zero with actual value) down

make permanent changes to /etc/sysconfig/network-scripts files

Then either reboot or

Machine 1
ifconfig eth0 ip_address network_mask

Machine 2
ifconfig eth0 ip_address network_mask

SEP

Re: Changing the hostname,ip

Michael Steele_2 — Sun, 23 Mar 2003 05:38:48 GMT

Why don't you just use NETCONF? Just choose manual configuration. Read the description below:

You can enter network configuration parameters in this window:
This machine's IP - enter IP number for this computer here
Network mask - enter netmask here. If omitted, mask will be calculated based on IP (which will not necessarily be right).
Broadcast address - enter network broadcast address here. If omitted broadcast address will be calculated based on IP (not mask! - which will not necessarily be right).
Default gateway - enter IP address of default network gateway (router) here.
Nameserver IP(s) - enter one or more (separated by spaces) name servers' IP addresses here. Can be omitted, but then domain names couldn't be used.
Default domain(s) - you can enter one or more (separated by spaces) domain names to search host if incomplete domain names will be used. It's optional.

http://dmacherowski.strony.wi.ps.pl/Pocket/manual.html.en.htm

Re: Changing the hostname,ip

CCIL — Sat, 05 Apr 2003 07:40:58 GMT

Hi there is command "set_parms" it provides various option like changing the IP address , hstname , date_time, root_passwd, etc. whne you are changing the IP address of the one machine make sure the other machine is out of network.

Re: Changing the hostname,ip

Steven E. Protter — Mon, 07 Apr 2003 02:22:12 GMT

Wait a minute. Isn't set_parms an HP-Ux only utility.

To Author: These guys posted great answers. Why don't you give them a point or two?

SEP