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HowToConfigureLinuxNetwork

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Added line 10:
Changed lines 54-57 from:
total 316
-rw-r--r--
3 root root 122 Nov 27 05:14 ifcfg-eth0
-rw-r--r-- 3 root root 162 Sep 26 10:45 ifcfg-eth0:1
to:
total 316
-rw-r--r-- 3 root root 122 Nov 27 05:14 ifcfg-eth0
-rw-r--r-- 3 root root 162 Sep 26 10:45 ifcfg-eth0:1
Changed lines 85-91 from:
DEVICE=eth0:0
ONBOOT=yes
BOOTPROTO=static
IPADDR=192.168.1.11
NETMASK=255.255.255.0
to:
DEVICE=eth0:0
ONBOOT=yes
BOOTPROTO=static
IPADDR=192.168.1.11
NETMASK=255.255.255.0
Changed lines 99-103 from:
NETWORKING=yes
HOSTNAME=ibm
GATEWAY=192.168.0.1
to:
NETWORKING=yes
HOSTNAME=ibm
GATEWAY=192.168.0.1
Deleted lines 108-115:
Kernel IP routing table

Destination Gateway Genmask Flags MSS Window irtt Iface
192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
0.0.0.0 192.168.0.1 0.0.0.0 UG 0 0 0 eth0
[trinity@ibm ~]$
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Added line 52:
Changed lines 89-90 from:
-------------
to:
Added lines 1-162:
%red%Determining Your IP Address

%blue%When Linux is installed, the ethernet device is called eth0

For wireless interface it will be called wlan0

The ifconfig command.

[root@ibm ~]# ifconfig -a
eth0 Link encap:Ethernet HWaddr 00:80:48:38:C6:14
inet addr:192.168.0.11 Bcast:192.168.0.255 Mask:255.255.255.0


%blue%Finding the interrupts associated with /proc/interrupts

file to get a listing of all the interrupt IRQs used by the system.

[root@ibm ~]# cat /proc/interrupts
CPU0
0: 419048047 XT-PIC timer
1: 144347 XT-PIC i8042
2: 0 XT-PIC cascade
3: 443514 XT-PIC Intel ICH
5: 0 XT-PIC i915@pci:0000:00:02.0
8: 3 XT-PIC rtc
9: 12726117 XT-PIC uhci_hcd
10: 0 XT-PIC acpi, uhci_hcd, eth0
11: 3216 XT-PIC ehci_hcd, uhci_hcd
12: 66 XT-PIC i8042
14: 1320937 XT-PIC libata
15: 18 XT-PIC ide1
NMI: 0
ERR: 0


%blue%Changing Your IP Address:

[root@ibm ~]# ifconfig eth0 10.0.0.1 netmask 255.255.255.0 up

[root@ibm sysconfig]# ll /etc/sysconfig/network

-rw-r--r-- 1 root root 48 Nov 27 05:12 /etc/sysconfig/network

%blue%The configuraton file can be found at /etc/sysconfig/network-scripts
directory.

Interface eth0 has a file called ifcfg-eth0, eth1 uses ifcfg-eth1, and so on.

[root@ibm ~]# cd /etc/sysconfig/network-scripts
[root@ibm network-scripts]# ls -l
total 316
-rw-r--r-- 3 root root 122 Nov 27 05:14 ifcfg-eth0
-rw-r--r-- 3 root root 162 Sep 26 10:45 ifcfg-eth0:1

%blue%Using the startup and stop script/commands the ifdown and ifup commands:

[root@ibm ~]# which ifdown
/sbin/ifdown

[root@ibm ~]# which ifup
/sbin/ifup


%blue%Using the command ifup and if down

[root@ibm ~]# ifdown eth0
[root@ibm ~]# ifup eth0

%blue%Configuring the DNS server to use:

/etc/resolve.conf

%blue% Creating multiple IP addresses associated with a single NIC.

IP aliasing is one of the most common ways of creating multiple
IP addresses associated with a single NIC.

[root@ibm ~]# ifconfig eth0:0 192.168.1.99 netmask 255.255.255.0 up

%blue%We have to create a /etc/sysconfig/network-scripts/ifcfg-eth0:0 file

DEVICE=eth0:0
ONBOOT=yes
BOOTPROTO=static
IPADDR=192.168.1.11
NETMASK=255.255.255.0
-------------
%blue%Configuring the default gateway:

[root@ibm ~]# route add default gw 192.168.1.1 eth0

%blue%Updating the /etc/sysconfig/network file to reflect the change.


NETWORKING=yes
HOSTNAME=ibm
GATEWAY=192.168.0.1


%blue%Checking the current routing table


[trinity@ibm ~]$ netstat -nr

Kernel IP routing table

Destination Gateway Genmask Flags MSS Window irtt Iface
192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
0.0.0.0 192.168.0.1 0.0.0.0 UG 0 0 0 eth0
[trinity@ibm ~]$

%blue%Adding Routes using the file /etc/sysconfig/network-scripts/route-eth0

%blue% File /etc/sysconfig/network-scripts/route-eth0

192.168.0.0/24 via 192.168.0.1

%blue%Checking network card status and speed etc..

mii-tool - view, manipulate media-independent interface status

[root@ibm ~]# mii-tool -v

eth0: negotiated 100baseTx-FD, link ok
product info: vendor 00:00:00, model 0 rev 0
basic mode: autonegotiation enabled
basic status: autonegotiation complete, link ok
capabilities: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
advertising: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
link partner: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control

Another Tool.

%blue%The ethtool command

ethtool - Display or change ethernet card settings

[root@ibm ~]# ethtool eth0

Settings for eth0:

Supported ports: [ TP MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Advertised auto-negotiation: Yes
Speed: 100Mb/s
Duplex: Full
Port: MII
PHYAD: 32
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: pumbg
Wake-on: d
Current message level: 0x00000007 (7)
Link detected: yes

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Page last modified on January 26, 2006, at 01:10 AM