Shulou(Shulou.com)06/01 Report--

This article mainly shows you "how to configure dual network cards and dual gateways in rhel6.5". The content is simple and clear. I hope it can help you solve your doubts. Let me lead you to study and learn this article "how to configure dual network cards and dual gateways in rhel6.5".

The server environment is as follows:

System: RHEL6.5

Telecom IP (TEL): 114.80.10.79 netmask 255.255.255.128 gateway 114.80.10.1

Unicom IP (CNC): 112.65.20.23 netmask 255.255.255.128 gateway 112.65.20.1

1. Configure the Nic information

Vi / etc/sysconfig/network-scripts/ifcfg-eth22

DEVICE=eth22

HWADDR=00:90:FA:76:A5:BC

TYPE=Ethernet

UUID=ebd54026-4412-4cc3-9f74-e065d4328072

ONBOOT=yes

NM_CONTROLLED=no

BOOTPROTO=static

IPADDR=114.80.10.79

NETMASK=255.255.255.128

Vi / etc/sysconfig/network-scripts/ifcfg-eth24

DEVICE=eth24

HWADDR=00:90:FA:76:A5:98

TYPE=Ethernet

UUID=ebd54026-4412-4cc3-9f74-e065d4328479

ONBOOT=yes

NM_CONTROLLED=no

BOOTPROTO=static

IPADDR=112.65.20.23

NETMASK=255.255.255.128

Note: there is no gateway in the configuration file of the two network cards. If you add a gateway, only one default route will be displayed in route-n, and the other network segment will not be available.

[root@test network-scripts] # route-n

Kernel IP routing table

Destination Gateway Genmask Flags Metric Ref Use Iface

112.65.20.0 0.0.0.0 255.255.255.128 U 0 0 0 eth24

114.80.10.0 0.0.0.0 255.255.255.128 U 0 0 0 eth22

112.65.20.0 0.0.0.0 255.255.255.0 U 0 0 0 eth24

114.80.10.0 0.0.0.0 255.255.255.0 U 0 0 0 eth22

169.254.0.0 0.0.0.0 255.255.0.0 U 1016 0 0 eth24

169.254.0.0 0.0.0.0 255.255.0.0 U 1016 0 0 eth22

0.0.0.0 112.65.20.1 255.255.255.128 UG 0 0 0 eth24

2. Modify rc.local

These two routes can be added directly, but will be lost after restart.

Route add-net 114.80.10.0 dev eth22 25 gw 114.80.10.1

Route add-net 112.65.20.0 net 25 gw 112.65.20.1 dev eth24

So to take effect permanently, or to modify the rc.local

Vi / etc/rc.d/rc.local

[root@test network-scripts] # cat / etc/rc.d/rc.local

#! / bin/sh

#

# This script will be executed * after* all the other init scripts.

# You can put your own initialization stuff in here if you don't

# want to do the full Sys V style init stuff.

Touch / var/lock/subsys/local

Route add-net 114.80.10.0 dev eth22 25 gw 114.80.10.1

Route add-net 112.65.20.0 net 25 gw 112.65.20.1 dev eth24

Then route-n

[root@test network-scripts] # route-n

Kernel IP routing table

Destination Gateway Genmask Flags Metric Ref Use Iface

112.65.20.0 112.65.20.1 255.255.255.128 UG 0 0 0 eth24

114.80.10.0 114.80.10.1 255.255.255.128 UG 0 0 0 eth22

112.65.20.0 0.0.0.0 255.255.255.0 U 0 0 0 eth24

114.80.10.0 0.0.0.0 255.255.255.0 U 0 0 0 eth22

169.254.0.0 0.0.0.0 255.255.0.0 U 1016 0 0 eth24

169.254.0.0 0.0.0.0 255.255.0.0 U 1016 0 0 eth22

(if you only need to add a default route, you can set it like this:

Route add default gw 112.65.20.1

Route del default gw 112.65.20.1 (you can delete the default route, which will take effect a few minutes after changing it in this way.)

Another way to do this is through the strategic routing configuration iproute2 toolkit. This package is developed by Alexey Kuznetsov and the main website of the package is ftp://ftp.inr.ac.ru/ip-routing/.

1. Add two routing tables: telecom: tel Unicom: cnc

# vi / etc/iproute2/rt_tables

252 tel

251 cnc

Save and launch

two。 Add routing rules

# ip route flush table tel

# ip route add default via 114.80.10.1 dev eth22 src 114.80.10.4 table tel

# ip ruleadd from 114.80.10.4 table tel

Here, the gateway of telecom is set up, and it can be realized that the resource access of telecom can only be accessed from the eth22 network card.

# ip route flush table cnc

# ip route add default via 112.65.20.1 dev eth24 src 112.65.20.2 table cnc

# ip rule add from 112.65.20.2 table cnc

Here, the gateway of China Unicom is set up, and it can be realized that the resource access of China Unicom can only be accessed from the eth24 network card.

3. Configure the network startup script file to add the following before the end

# vi / etc/rc.d/init.d/network

Ip route flush table tel

Ip route add default via 114.80.10.1 dev eth22 src 114.80.10.4 table tel

Ip rule add from 114.80.10.4 table tel

Ip route flush table cnc

Ip route add default via 112.65.20.1 dev eth24 src 112.65.20.2 table cnc

Ip rule add from 112.65.20.2 table cnc

Exit 0

5. Exit and restart the network

# / etc/rc.d/init.d/network restart

If you test the machine network again at this time, you will find that the addresses of Telecom and China Unicom can be accessed normally. This method can also make the request from the telecom IP return according to the telecommunication route, and the request from the Netcom IP return from the Netcom route.

6. When the server restarts, the above routing rules will be invalid, so you need to write the above command into the system startup script

RedHat/CentOS, the system startup script is / etc/rc.d/rc.local

These are all the contents of the article "how to configure dual network cards and dual gateways in rhel6.5". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.