Router in linux

For details about the linux-based router-Linux Enterprise Application-Linux server application, see the following section. Set multiple ip addresses for one network card

The temporary ip address disappears after restart: ifconfig eth0: 0 192.168.0.4 netmask 255.255.255.255.0 broadcast 192.168.0.255 up

If a row cannot be written, it can be separated \.

Ifconfig eth0; ifconfig eth0: 0

Set a fixed ip Address by modifying the configuration file/etc/sysconfig/network-scripts/ifcfg-eth0 or

/Etc/sysconfig/network-scripts/ifcfg-eth0: 0 to implement

Note: The premise for starting eth0: 0 is that eth0 must be started first, and they have the same mac address.

Route addition and Deletion

Route add-net 192.168.0.0 netmask 255.255.255.0 dev eth0
Route del-net 192.168.0.0 netmask 255.255.255.0 dev eth0

You must enable the routing function for multi-network communication between multiple NICs and multiple network segments on a linux host.

Echo 1> specify the gateway for the/proc/sys/net/ipv4/ip_forward client.