Question

Linux IP Change ?

Asked by: focusen

So I only have the shell to work with, I am using red hat.  I changed the Ip address of my machine to the new IP scheme using netconfig.  however after the change no one can ping the linux box and the linux box can not ping anything either.  IS there another place I need to change it ?  Am I doing something wrong.  Just remeber I only have the shell to work with .. Please help!

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Asked On
2006-07-28 at 19:57:23ID21936131
Tags

ip

,

linux

,

change

Topic

Linux Networking

Participating Experts
7
Points
500
Comments
12

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Answers

 

by: alextoftPosted on 2006-07-28 at 20:53:25ID: 17206304

That should be sufficient to change the address. Perhaps tell us what your IP schema is (IP, subnet, route), and paste the output of ifconfig eth0 and we can get an idea of what the issue may be.

 

by: rindiPosted on 2006-07-29 at 00:18:30ID: 17206744

Maybe you also just need to restart networking?

/etc/init.d/network restart

 

by: ibu1Posted on 2006-07-29 at 01:43:47ID: 17207020

try authconfig command

 

by: harbor235Posted on 2006-07-29 at 05:24:01ID: 17207398

If you are using a new IP range on your system then your default gateway must also change, your default gateway (router) is your connection
to networks outside your local segment.

So, for example:

if your ip is 192.168.1.150 255.255.255.0, your default gateway address must also be in the same range. Typically, most network admins will
set it to 192.168.1.1. Who perfroms the networking function at your location?

Why are you changing your IP address scheme?

Make sure you coordinate your changes with the Network Admin.


Need more info:


harbor235 ;}

 

by: jonesy2kPosted on 2006-07-29 at 21:04:39ID: 17209737

Another thing to consider is the iptables firewall rules.
If they are configured specifically for the previous IP address, they may not allow traffic to the new one.

 

by: charan_jeetsinghPosted on 2006-07-30 at 00:28:31ID: 17210193

hi there...

Just check the file:
/etc/sysonfig/network-scripts/ifcfg-ethX     for ips are rightly mentioned there.

once done, make sure you always restart the network services after changing ip
Service network restart

check for iptables: true
service iptables status

if running check for the allow rules

iptables -L

Cj

 

by: focusenPosted on 2006-07-30 at 11:52:52ID: 17211682

IT is the firewall.  How can I from the shell either disable the firewall, or edit the firewall to allow the new ip scheme

 

by: focusenPosted on 2006-07-30 at 12:09:39ID: 17211725

I found how to stop the service but I reall want to edit it to the new scheme.. How can I edit the script ?

 

by: pjedmondPosted on 2006-07-31 at 12:32:26ID: 17218503

You can edit your interface configuration directly:

/etc/sysconfig/network-scripts/ifcfg-eth0    should contain something similar to:

-------8X---------
# VIA Technologies|VT86C100A [Rhine]
DEVICE=eth0
ONBOOT=yes
BOOTPROTO=static
IPADDR=192.168.1.100
NETMASK=255.255.255.0
GATEWAY=192.168.1.1
-------8X---------

After editing, you need to:

/etc/init.d/network restart

Alternatively, you can run:

redhat-config-network

or

netconfig

as another way of changing the values.

To disable the firewall, you need to:

iptables -F
or
ipchains -F

This clears the firewalls depending on whether you are using iptables or ipchains.

(   (()
(`-' _\
 ''  ''

20120131-EE-VQP-002

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