changing ip address on the fly in slackware

rigelan · 08-20-2010, 10:16 PM

If I need to adjust my network settings (rc.inet1.conf) on the fly, like if I need to be in the local network of a router I just bought (192.168.1.x), in order to change the subnet to the rest of my network (192.168.0.x), then I need to adjust the ip address of my slackware box.

Up till now I have rewritten the rc.inet.conf file and then restarted the computer. I am almost positive that restarting is unneccesary, but I have not been successful in finding any other method.

Maybe I am using the tool wrong, but I have tried using wicd to disconnect and then connect again once I change the rc.inet1.conf. I don't think it worked.

I think I have also tried issuing a rc.inet1 restart. But I don't think that this changed my ip address either. How do you change your ip address on the quick without restarting your box?

the3dfxdude · 08-20-2010, 10:37 PM

As root:
# ifconfig eth0 192.168.0.x

Replace eth0 and x with your own. I don't know if this interferes with wicd.

slac-in-the-box · 08-21-2010, 12:00 AM

simply executing /etc/rc.d/rc.inet1 should restart the network and use the changes you made to rc.inet1.conf

so you definitely shouldn't have to reboot...

If you don't even want to mess with the text files (i.e., don't need change to be permanent), then you can just use ifconfig to assign an ip to an interface

Code:

ifconfig eth0 inet 192.168.1.2 netmask 255.255.255.0

onebuck · 08-21-2010, 07:07 AM

Hi,

Actually;

Code:

ifconfig eth0 192.168.1.2

The above IP assignment would be all that is necessary unless you need to change the netmask.

Be aware that to change the IP may cause problems with any of the other machines that where set to the previous machine IP assignment.

catkin · 08-21-2010, 10:37 AM

Quote:

Originally Posted by slac-in-the-box

simply executing /etc/rc.d/rc.inet1 should restart the network and use the changes you made to rc.inet1.conf

AIUI the default action of the rc.inet1 script is to start rather than restart (stop followed by start).

The rc.inet1 script can stop and start (but not restart) an individual interface, for example

Code:

/etc/rc.d/rc.inet1 eth0_stop
/etc/rc.d/rc.inet1 eth0_start

IDK under what conditions an interface should be stopped before being started with a new configuration -- so it seems prudent to do it in all cases in case it matters.

rigelan · 08-21-2010, 10:42 AM

Code:

/etc/rc.d/rc.inet1 eth0_stop
/etc/rc.d/rc.inet1 eth0_start

You have to specify the interface when using rc.inet1 ?

bgeddy · 08-21-2010, 01:11 PM

The allowed arguments to rc.inet1 are start,stop,restart,up,down which act on all interfaces or INT_start, INT_stop, INT_restart, INT_up, INT_down where INT is the name of an interface to start which is the same as "up", stop - the same as "down" or restart.

rc.inet1 now has it's own man page so man rc.inet1 will give you the information.

catkin · 08-21-2010, 01:19 PM

Quote:

Originally Posted by bgeddy

The allowed arguments to rc.inet are start,stop,restart,up,down which act on all interfaces or INT_start, INT_stop, INT_restart, INT_up, INT_down where INT is the name of an interface to start which is the same as "up", stop - the same as "down" or restart.

That is correct; I was wrong about it not supporting the INT_restart argument.