LinuxQuestions.org - Setting static IP

- Linux - Newbie (https://www.linuxquestions.org/questions/linux-newbie-8/)

- - Setting static IP (https://www.linuxquestions.org/questions/linux-newbie-8/setting-static-ip-4175468784/)

Clearly there are some other files where NIC is getting IP address other than what you are specifying (192.168.0.201 & 192.168.0.106).

Give o/p of following commands:

Code:

# ls -l /etc/sysconfig/network-scripts/ifcfg-*

# cat /etc/sysconfig/network-scripts/ifcfg-eth0

# cat /etc/sysconfig/network-scripts/ifcfg-wlan0

# cat /etc/udev/rules.d/70-persistent-net.rules

# service NetworkManager status

# service network status

# route

...Or, simply what you can do is

Delete all ifcfg-* files in /etc/sysconfig/network-scripts/ (or move it to somewhere else).
Delete file /etc/udev/rules.d/70-persistent-net.rules
Start NetworkManager if switched off (chkconfig NetworkManager on)
Reboot
start system-config-network tool
Choose 'Device Configuration' and set static IP address for both Network Interfaces (wired & wireless).
Restart network service (service network restart)
Now use the created files (ifcfg-eth0 and ifcfg-wlan0) as templates for future edits.
Switchoff NetworkManager if you dont want (chkconfig NetworkManager off)

Thank you mddesai,

Quote:

Clearly there are some other files where NIC is getting IP address other than what you are specifying (192.168.0.200 & 192.168.0.106).

Code:

login as: root

root@192.168.0.200's password:

Last login: Mon Jul  8 04:16:49 2013 from 192.168.0.104

[root@desktop ~]# ls -l /etc/sysconfig/network-scripts/ifcfg-*

-rw-r--r--. 3 root root 276 Jul  7 14:09 /etc/sysconfig/network-scripts/ifcfg-eth0

-rw-r--r--. 1 root root 254 Jan  9 03:13 /etc/sysconfig/network-scripts/ifcfg-lo

-rw-r--r--. 3 root root 351 Jul  8 03:28 /etc/sysconfig/network-scripts/ifcfg-wlan0

[root@desktop ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE=eth0

BOOTPROTO="Static"

HWADDR=88:51:fb:51:df:70

IPV6INIT=yes

IPV6_AUTOCONF="yes"

NM_CONTROLLED=yes

ONBOOT=yes

TYPE=Ethernet

UUID="e636c50d-822a-498b-8156-3c3b75d4fe4b"

USERCTL=no

IPADDR=192.168.0.201

NETMASK=255.255.255.0

DNS2=8.8.4.4

GATEWAY=192.168.0.1

DNS1=8.8.8.8

[root@desktop ~]# cat /etc/sysconfig/network-scripts/ifcfg-wlan0

# Please read /usr/share/doc/initscripts-*/sysconfig.txt

# for the documentation of these parameters.



DEVICE=wlan0

NAME=wlan0

TYPE=Wireless



ONBOOT=yes

BOOTPROTO=none

#NM_CONTROLLED=yes



IPADDR=192.168.0.200

PREFIX=24

# NETMASK=255.255.255.0

GATEWAY=192.168.0.1



DNS1=8.8.8.8

DNS2=8.8.4.4



DEFROUTE=yes

IPV4_FAILURE_FATAL=yes

IPV6INIT=no

USERCTL=no

[root@desktop ~]# cat /etc/udev/rules.d/70-persistent-net.rules

# This file was automatically generated by the /lib/udev/write_net_rules

# program, run by the persistent-net-generator.rules rules file.

#

# You can modify it, as long as you keep each rule on a single

# line, and change only the value of the NAME= key.



# PCI device 0x10ec:0x8168 (r8169)

SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="88:51:fb:51:df:70", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"



# PCI device 0x1814:0x539b (rt2800pci)

SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="b8:76:3f:69:31:95", ATTR{type}=="1", KERNEL=="wlan*", NAME="wlan0"

[root@desktop ~]# service NetworkManager status

NetworkManager: unrecognized service

[root@desktop ~]# service network status

Configured devices:

lo eth0 wlan0

Currently active devices:

lo wlan0 eth0

[root@desktop ~]# service NetworkManager status

NetworkManager: unrecognized service

[root@desktop ~]# route

Kernel IP routing table

Destination    Gateway        Genmask        Flags Metric Ref    Use Iface

192.168.0.0    *              255.255.255.0  U    0      0        0 wlan0

192.168.0.0    *              255.255.255.0  U    0      0        0 eth0

link-local      *              255.255.0.0    U    1002  0        0 wlan0

link-local      *              255.255.0.0    U    1003  0        0 eth0

default        192.168.0.1    0.0.0.0        UG    0      0        0 wlan0

[root@desktop ~]# ifconfig

eth0      Link encap:Ethernet  HWaddr 88:51:FB:51:DF:70

          inet addr:192.168.0.201  Bcast:192.168.0.255  Mask:255.255.255.0

          UP BROADCAST MULTICAST  MTU:1500  Metric:1

          RX packets:0 errors:0 dropped:0 overruns:0 frame:0

          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)



lo        Link encap:Local Loopback

          inet addr:127.0.0.1  Mask:255.0.0.0

          inet6 addr: ::1/128 Scope:Host

          UP LOOPBACK RUNNING  MTU:16436  Metric:1

          RX packets:2 errors:0 dropped:0 overruns:0 frame:0

          TX packets:2 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:0

          RX bytes:104 (104.0 b)  TX bytes:104 (104.0 b)



wlan0    Link encap:Ethernet  HWaddr B8:76:3F:69:31:95

          inet addr:192.168.0.106  Bcast:192.168.0.255  Mask:255.255.255.0

          inet6 addr: fe80::ba76:3fff:fe69:3195/64 Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:91083 errors:0 dropped:0 overruns:0 frame:0

          TX packets:6558 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:27503823 (26.2 MiB)  TX bytes:737707 (720.4 KiB)



[root@desktop ~]#

Quote:

...Or, simply what you can do is

Should I also delete /etc/sysconfig/networking/profiles/default/ifcfg-wlan0 and /etc/sysconfig/networking/devices/ifcfg-wlan0?

Quote:

# ls -l /etc/sysconfig/network-scripts/ifcfg-*

OK. Only interface files available are ifcfg-eth0, ifcfg-wlan0 and ifcfg-lo

Quote:

# cat /etc/sysconfig/network-scripts/ifcfg-eth0

Working properly. Yo have set IP to 192.168.0.201/24, and in ifconfig its showing IP as 192.168.0.201 (eth0). No problemo.

Quote:

# cat /etc/sysconfig/network-scripts/ifcfg-wlan0

I'm not expert in wifi setup, but what i understand is wifi are protected and you have to give encryption key (for WEP/WPA etc) to connect to wireless access point. You should also mention SSID of that wireless router, i guess. Anyway, just look at these links.. you will get an idea. Also i never knew there is iwconfig just like ifconfig. this is something new to me. great...

Enabling wpa_supplicant without NetworkManager
How to configure Wireless on CentOS System
http://www.pantz.org/software/wpa_su...2andlinux.html

Quote:

# cat /etc/udev/rules.d/70-persistent-net.rules

Hardware address for wired interface (eth0) is "88:51:fb:51:df:70" - and thats what you have put in ifcfg-eth0. OK
Hardware address for wireless interface (wlan0) is "b8:76:3f:69:31:95" - You have to mention it in ifcfg-wlan0, as you have two network interfaces.
If you think/doubt hardware addresses are not correct, then you can delete 70-persistent-net.rules file. CentOS will automatically create new file at next boot, and present correct hw address for NICs.

Code:

# service NetworkManager status

NetworkManager: unrecognized service

So you are not using Network Manager, then there is no need to specify 'NM_CONTROLLED=yes' parameter in config files

Quote:

# route

I just wanted to see are there any other subnets. only available subnet is 192.168.0.0/24. OK

Hmmm!!! The only problem is wireless interface... i guess you have to go through the links i have provided. This is out of my expertise.

Edit:

Quote:

Should I also delete /etc/sysconfig/networking/profiles/default/ifcfg-wlan0 and /etc/sysconfig/networking/devices/ifcfg-wlan0?

You can try that... but make sure to take backup of those config files before deleting them.