How to assign IP address to 2nd ethernet card

gardenair · 06-22-2010, 02:02 AM

hi,
In my red hat Linux machine there was a Lan card using eth0. IP is asign to that network card and it is functioning properly. I add another ethernet card in my linux machineit was detacted and when i use the command

Quote:

[root@localhost root] # ifconfig -a

it show me both eth0 and eth1 lan cards.I can see Ip address in my eth1 ethernet card but When I enter into

Code:

[root@localhost root] # cd /etc/sysconfig/network-scripts

and i use ls command it only show me the file ifcfg-eth1 and with
[

Code:

root@localhost root] # cat ifcfg-eth1

I can see the IP address

Please guide me that how can I configure my second ethernet card which is eth0.There is no file of eth0 to add my IP into it!

alli_yas · 06-22-2010, 02:38 AM

Post the output of:

Code:

#ifconfig -a

and

Code:

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

and

Code:

#cat /etc/sysconfig/network-scripts/ifcfg-eth1

Also, consider the following:

1. Do you want to bond your two NIC's into one interface with one IP?

2. Alternately will each of your NIC's have its own address; on different subnets and/or VLANs?

GlennsPref · 06-22-2010, 02:40 AM

Hi, On the command line I use the ifconfig command it'self to look after these tasks.

ie, setting up ip addresses and mtu settings, broadcast address, etc

See this page for more...

http://linux.die.net/man/8/ifconfig

To set the ip for eth0, (as root)

Code:

ifdown eth0

Code:

ifconfig eth0 address 192.168.0.1

(example, private ip address range)

Code:

ifconfig eth0 broadcast 192.168.0.255

(example, private ip address range)

Code:

ifconfig eth0 netmask 255.255.255.0

Code:

ifconfig eth0 mtu 1492

(for one card the mtu is 1500, an extra (second) card will require 8 bits of that mtu, Releaves blockages) I set mtu for eth0 and eth1 to 1492, my experience.

Code:

ifup eth0

Hope this helps, Cheers Glenn

gardenair · 06-22-2010, 03:09 AM

thanks for the reply. well actually i have two different 10.1.1.10 and 192.168.1.10 both are private address and I want to bound these IP to eth0 and eth1.
when i use

Code:

#cat /etc/sysconfig/network-scripts/ifcfg-eth1

it show me the Ip address but when I use

Code:

#cat /etc/sysconfig/network-scripts/ifcfg-eth0
cat: ifcfg-eth0:No such file or directory

it show this message.

I can see " ifcgh-eth1 " file in network-scripts but not " ifcgh-eth1 "

what is the way I assign Ip address to eth0 ?

vikas027 · 06-22-2010, 04:52 AM

Post output as asked by alli_yas

gardenair · 06-22-2010, 06:07 AM

Not understand.....

alli_yas · 06-22-2010, 06:11 AM

If you run the commands I asked for in my earlier post; at the terminal; you will get an output to each command.

Cut and paste this output into a post within this thread.

If you don't understand fully, get someone who understands English a bit better to read the thread.

gardenair · 06-22-2010, 06:26 AM

Thanks again for the reply. Well i am typing it in a brief.

ifconfig -a

Quote:

eth0 Link encap:Ethernet HWassr
BROADCAST MULTICAST MUT:1500 Metric:1
RX packets:0 errors:0 drops:0 overruns:0 frams:0
TX packets:0 errors:0 drops:0 overruns:0 frams:0
collisions:0 txqueuelen:100
RX bytes:0 (0.0 b) TX bytes0: (0.0 b)
Interrrupt:10 Base Address:0X200

eth1 Link encap:Ethernet HWassr
inet addr:192.168.1.10 Bcast:192.168.1.255 Mask:255.255.255.0

lo Link encap:Local loopback
inet addre:127.0.0.1 Mask:255.0.0.0

#cat /etc/sysconfig/network-scripts/ifcfg-eth0
cat: ifcfg-eth0:No such file or directory

#cat /etc/sysconfig/network-scripts/ifcfg-eth1

DEVICE=eth1
ONBOOT=yes
BOOTPROTO=none
IPADDR=192.168.1.10
NETMASK:255.255.255.0
USERCTL=no
PEERDNS=no
TYPE=Ethernet
NETWORK=192.168.1.0
BROADCAST=192.168.1.255

GlennsPref · 06-22-2010, 07:47 AM

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

Code:

DEVICE=eth0
BOOTPROTO=static
IPADDR=10.1.1.10
NETMASK=255.255.255.0
GATEWAY=10.1.1.1
ONBOOT=yes
METRIC=10
MII_NOT_SUPPORTED=no
USERCTL=yes
RESOLV_MODS=no
LINK_DETECTION_DELAY=6
IPV6INIT=no
IPV6TO4INIT=no

Instead of creating this file, which may look something like this, above...

I would run through the commands I listed above, in a shell as root. Be sure to change the ip's as required.

A terminal for the shell may be Konsole, xterm, terminal, and others.
(cli = Command Line Interface) And the file will be created automagically.

Cheers Glenn