实现A与B跨三网段互相访问
- 环境说明：
- 五台机器，客户端：client1、client2，充当路由：centos6.10、srv1、srv2
- centos6.10：vmnet3、4，srv1：vmnet4、5，srv2：vmnet5、6
-
client1：vmnet3、client2：vmnet6
最终实现
虚拟机网卡信息
实现配置
#R1
[root@R1 ~]$vim /etc/sysconfig/network-scripts/ifcfg-eth2
DEVICE=eth2
NAME=vmnet3
BOOTPROTO=static
IPADDR=192.168.1.254
PREFIX=24
ONBOOT=yes
[root@R1 ~]$vim /etc/sysconfig/network-scripts/ifcfg-eth1
DEVICE=eth1
NAME=vmnet4
BOOTPROTO=static
IPADDR=192.168.10.1
PREFIX=24
ONBOOT=yes
[root@R1 ~]$ service NetworkManager stop
[root@R1 ~]$ service network restart
[root@R1 ~]$ route add -net 172.16.1.0/24 gw 192.168.10.254 dev eth1
[root@R1 ~]$ route add -net 1.1.1.0/24 gw 192.168.10.254 dev eth1
[root@R1 ~]$ sysctl -w net.ipv4.ip_forward=1
[root@R1 ~]$ route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth2
172.16.1.0 192.168.10.254 255.255.255.0 UG 0 0 0 eth1
192.168.139.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
1.1.1.0 192.168.10.254 255.255.255.0 UG 0 0 0 eth1
192.168.10.0 192.168.10.254 255.255.255.0 UG 0 0 0 eth1
192.168.10.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
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 eth2
169.254.0.0 0.0.0.0 255.255.0.0 U 1004 0 0 eth1
0.0.0.0 192.168.139.2 0.0.0.0 UG 0 0 0 eth0
#R2
[root@R2 ~]# vim /etc/sysconfig/network-scripts/ifcfg-eth1
DEVICE=eth1
NAME=vmnet4
BOOTPROTO=none
IPADDR=172.16.1.253
PREFIX=24
ONBOOT=yes
[root@R2 ~]# vim /etc/sysconfig/network-scripts/ifcfg-eth2
DEVICE=eth2
NAME=vmnet5
BOOTPROTO=none
IPADDR=172.16.1.253
PREFIX=24
ONBOOT=yes
[root@R2 ~]# systemctl stop NetworkManager
[root@R2 ~]# systemctl restart network
[root@R2 ~]# route add -net 192.168.1.0/24 gw 192.168.10.1 dev eth1
[root@R2 ~]# route add -net 1.1.1.0/24 gw 172.16.1.254 dev eth2
[root@R2 ~]$ sysctl -w net.ipv4.ip_forward=1
[root@R2 ~]#route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.139.2 0.0.0.0 UG 100 0 0 eth0
1.1.1.0 172.16.1.254 255.255.255.0 UG 0 0 0 eth2
172.16.1.0 0.0.0.0 255.255.255.0 U 102 0 0 eth2
192.168.1.0 192.168.10.1 255.255.255.0 UG 0 0 0 eth1
192.168.10.0 0.0.0.0 255.255.255.0 U 101 0 0 eth1
192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0 virbr0
192.168.139.0 0.0.0.0 255.255.255.0 U 100 0 0 eth0
#R3
[root@R3 ~]$ vim /etc/sysconfig/network-scripts/ifcfg-eth1
DEVICE=eth1
NAME=vmnet5
BOOTPROTO=none
IPADDR=172.16.1.254
PREFIX=24
ONBOOT=yes
[root@R3 ~]$ vim /etc/sysconfig/network-scripts/ifcfg-eth2
DEVICE=eth2
NAME=vmnet6
BOOTPROTO=none
IPADDR=1.1.1.254
PREFIX=24
ONBOOT=yes
[root@R3 ~]$ systemctl stop NetworkManager
[root@R3 ~]$ systemctl restart network
[root@R3 ~]$ route add -net 192.168.10.0/24 gw 172.16.1.253 dev eth1
[root@R3 ~]$ route add -net 192.168.1.0/24 gw 172.16.1.253 dev eth1
[root@R3 ~]$ sysctl -w net.ipv4.ip_forward=1
[root@R3 ~]# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.139.2 0.0.0.0 UG 0 0 0 eth0
1.1.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth2
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
169.254.0.0 0.0.0.0 255.255.0.0 U 1004 0 0 eth2
172.16.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth1
192.168.1.0 172.16.1.253 255.255.255.0 UG 0 0 0 eth1
192.168.10.0 172.16.1.253 255.255.255.0 UG 0 0 0 eth1
192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0 virbr0
192.168.139.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
测试
#client1:
ip addr add 192.168.1.7/24 dev eth0
route add default gw 192.168.1.254
ping -c3 1.1.1.1
image.png
#client2:
ip addr add 1.1.1.1/24 dev eth0
route add default gw 1.1.1.1
ping -c3 192.168.1.7
image.png
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