实现主机之间跨路由跨网段通讯

实现主机之间跨路由跨网段通讯。写下配置步骤

一，IP地址配置

 A

[root@localhost network-scripts]# cat ifcfg-eth0 
NAME=eth0
DEVICE=eth0
ONBOOT=yes
BOOTPROTO=static
IPADDR=172.16.0.10
PREFIX=24

R1

[root@localhost network-scripts]# cat ifcfg-eth0
NAME=eth0
DEVICE=eth0
ONBOOT=yes
BOOTPROTO=static
IPADDR=172.16.0.254
PREFIX=24
[root@localhost network-scripts]# cat ifcfg-eth1
NAME=eth1
DEVICE=eth1
ONBOOT=yes
BOOTPROTO=static
IPADDR=10.0.0.252
PREFIX=24

R2

[root@localhost network-scripts]# cat ifcfg-eth1
NAME=eth1
DEVICE=eth1
ONBOOT=yes
BOOTPROTO=static
IPADDR=10.0.0.253
PREFIX=24
[root@localhost network-scripts]# cat ifcfg-eth0
NAME=eth0
DEVICE=eth0
ONBOOT=yes
BOOTPROTO=static
IPADDR=192.168.0.254
PREFIX=24

[root@localhost network-scripts]# cat ifcfg-eth0 
NAME=eth0
DEVICE=eth0
ONBOOT=yes
BOOTPROTO=static
IPADDR=192.168.0.10
PREFIX=24

 二，路由配置

echo 1 > /proc/sys/net/ipv4/ip_forward
[root@localhost ~]# vi /etc/sysctl.conf 
[root@localhost ~]# sysctl -p
net.ipv4.ip_forward = 1

 默认有直连路由

[root@localhost ~]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
10.0.0.0        0.0.0.0         255.255.255.0   U     101    0        0 eth1
192.168.0.0     0.0.0.0         255.255.255.0   U     100    0        0 eth0
192.168.122.0   0.0.0.0         255.255.255.0   U     0      0        0 virbr0
[root@localhost ~]# ip route 
10.0.0.0/24 dev eth1 proto kernel scope link src 10.0.0.253 metric 101 
192.168.0.0/24 dev eth0 proto kernel scope link src 192.168.0.254 metric 100 
192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1 linkdown

加主机路由用-host选项，加网段用-net 192.168.0.0/24 第一种方法

过去

route add -net 192.168.0.0/24 gw 10.0.0.254 R1 route add -net 192.168.0.0/24 gw 10.0.0.253 回来 B route add -net 172.16.0.0/24 ge 192.168.0.254 R2 route add -net 172.16.0.0/24 gw 10.0.0.252   第二种方法 A route add -net 192.168.0.0/24 gw 10.0.0.254 dev eth0 R1 route add -net 192.168.0.0/24 gw 10.0.0.253 dev eth1 回来 B route add -net 172.16.0.0/24 ge 192.168.0.254 dev eth0 R2 route add -net 172.16.0.0/24 gw 10.0.0.252 dev eth1   测试  route 命令添加的路由，机器重启或者网卡重启后就没掉了，在/etc/rc.local里添加如下命令