Shulou(Shulou.com)06/02 Report--

Because the linux server has multiple network cards, some network cards need to take the specified route, so the static route needs to be set separately.

The static route added by route add will be lost if the server is restarted or the network card is restarted.

[root@test ~] # route-n

Kernel IP routing table

Destination Gateway Genmask Flags Metric Ref Use Iface

192.168.123.0 0.0.0.0 255.255.255.0 U 0 0 0 eth2

10.0.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0

169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth2

0.0.0.0 192.168.123.254 0.0.0.0 UG 0 0 0 eth2

Use route add to add static routes.

[root@test ~] # route add-net 10.0.0.0 netmask 255.0.0.0 dev eth0

[root@test ~] # route-n

Kernel IP routing table

Destination Gateway Genmask Flags Metric Ref Use Iface

192.168.123.0 0.0.0.0 255.255.255.0 U 0 0 0 eth2

10.0.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0

169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth2

10.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 eth0

0.0.0.0 192.168.123.254 0.0.0.0 UG 0 0 0 eth2

The route was added successfully, but the route was lost after restarting the network service, which proves that the route is a dynamic parameter.

[root@test ~] # service network restart

Shutting down interface eth0: [OK]

Shutting down interface eth2: [OK]

Shutting down loopback interface: [OK]

Bringing up loopback interface: [OK]

Bringing up interface eth0: [OK]

Bringing up interface eth2: [OK]

[root@test ~] # route-n

Kernel IP routing table

Destination Gateway Genmask Flags Metric Ref Use Iface

192.168.123.0 0.0.0.0 255.255.255.0 U 0 0 0 eth2

10.0.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0

169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth2

0.0.0.0 192.168.123.254 0.0.0.0 UG 0 0 0 eth2

Static routes need to be permanently added:

Go to / etc/sysconfig/network-scripts/

[root@test ~] # cd / etc/sysconfig/network-scripts/

Add a static route to route-eth0 so that the network service will automatically load this information each time it is restarted. Ensure that the route is not lost.

[root@shwmsdb1 network-scripts] # cat route-eth0

10.0.0.0/8 via 10.0.0.254

[root@test ~] # route-n

Kernel IP routing table

Destination Gateway Genmask Flags Metric Ref Use Iface

192.168.123.0 0.0.0.0 255.255.255.0 U 0 0 0 eth2

10.0.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0

169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth2

10.0.0.0 10.0.0.254 255.0.0.0 UG 0 0 0 eth0

0.0.0.0 192.168.123.254 0.0.0.0 UG 0 0 0 eth2

In this way, whether it is restarting the host or restarting the network service routing information will not be lost.

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