1、配置网卡信息

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

DEVICE=eth0

TYPE=Ethernet

UUID=acfc4aa3-b47d-41d6-a841-0f7cad69f877

ONBOOT=yes

NM_CONTROLLED=yes

BOOTPROTO=static

HWADDR=00:24:1d:9d:ad:6e

IPADDR=192.168.0.251

PREFIX=24

#GATEWAY=192.168.0.1

#DNS1=114.114.114.114

#DNS2=8.8.8.8

#DEFROUTE=yes

#IPV4_FAILURE_FATAL=yes

#IPV6INIT=no

#NAME="System eth0"

NETMASK=255.255.255.0

USERCTL=no

vim /etc/sysconfig/network-scripts/ifcfg-eth1

DEVICE=eth1

TYPE=Ethernet

ONBOOT=yes

#NM_CONTROLLED=yes

BOOTPROTO=static

IPADDR=192.168.5.251

GATEWAY=192.168.5.1

#DNS1=8.8.8.8

#DNS2=192.168.5.1

#DEFROUTE=yes

#IPV4_FAILURE_FATAL=yes

#IPV6INIT=no

#NAME="System eth1"

NETMASK=255.255.255.0

USERCTL=no

重启网卡

service network restart

2、查看路由表

route –n

Kernel IP routing table

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface

192.168.5.0     0.0.0.0         255.255.255.0   U     0      0        0 eth1

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     1002   0        0 eth0

169.254.0.0     0.0.0.0         255.255.0.0     U     1003   0        0 eth1

0.0.0.0         192.168.5.1     0.0.0.0         UG    0      0        0 eth1

3、开启转发

vim /etc/sysctl.conf   
net.ipv4.ip_forward = 1

4、#开放其它主机的icmp包转发
iptables -A FORWARD -p icmp --icmp-type any -j ACCEPT