Setup with 2 ethernet interfaces and 2 IP addresses in the same subnet of a class C

ursusca · 12-25-2008, 04:29 AM

Hi all!

I have 2 ethernet cards on my red hat AS 4 server and I want to configure it with 2 ethernet interfaces and 2 different IP addresses in the same subnet of a class C.

How can I do it correctly?

Brian1 · 12-25-2008, 08:12 AM

If I understand you are looking at channel bonding. Search www.google.com/linux Search for redhat bonding. Now with this setup only on interface the master has an IP the others are slaves. Not really having an IP.

Brian

napo · 12-25-2008, 02:32 PM

From what I understand all you have to do is set a static ip address for each Network card. Somthing like this:

Code:

sudo ifconfig eth0 192.168.0.1
sudo ifconfig eth1 192.168.0.2

it can also be done in "/etc/network/interfaces" like:

Code:

auto eth0
iface eth0 inet static
    address 192.168.0.1
    network 192.168.0.0
    netmask 255.255.255.0
    broadcast 192.168.0.255

auto eth1
iface eth1 inet static
    address 192.168.0.2
    network 192.168.0.0
    netmask 255.255.255.0
    broadcast 192.168.0.255

ursusca · 12-25-2008, 04:21 PM

You are right napo.
Now I have:

/etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
BOOTPROTO=none
HWADDR=00:E0:80:79:9F:53
ONBOOT=yes
TYPE=Ethernet
IPADDR=XXX.XXX.XXX.12
NETMASK=255.255.255.0
USERCTL=no
IPV6INIT=no
PEERDNS=yes
GATEWAY=XXX.XXX.XXX.91

/etc/sysconfig/network-scripts/ifcfg-eth2
DEVICE=eth2
BOOTPROTO=none
HWADDR=00:E0:81:79:9F:55
ONBOOT=yes
TYPE=Ethernet
IPADDR=XXX.XXX.XXX.11
NETMASK=255.255.255.0
USERCTL=no
IPV6INIT=no
PEERDNS=yes
GATEWAY=XXX.XXX.XXX.91

I can't understand how it's working because when I down one of interfaces I can ping both.