Pengguna:Sam tolle

Network IP aliasing:

Assign more than one IP address to one ethernet card:

   ifconfig eth0   XXX.XXX.XXX.XXX netmask 255.255.255.0 broadcast XXX.XXX.XXX.255
   ifconfig eth0:0 192.168.10.12   netmask 255.255.255.0 broadcast 192.168.10.255
   ifconfig eth0:1 192.168.10.14   netmask 255.255.255.0 broadcast 192.168.10.255
    
   route add -host XXX.XXX.XXX.XXX dev eth0
   route add -host 192.168.10.12 dev eth0
   route add -host 192.168.10.14 dev eth0

In this example 0 and 1 are aliases in addition to the regular eth0. The result of the ifconfig command:

         eth0      Link encap:Ethernet  HWaddr 00:10:4C:25:7A:3F  
         inet addr:XXX.XXX.XXX.XXX  Bcast:XXX.XXX.XXX.255  Mask:255.255.255.0
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
         RX packets:14218 errors:0 dropped:0 overruns:0 frame:0
         TX packets:1362 errors:0 dropped:0 overruns:0 carrier:0
         collisions:1 txqueuelen:100 
         Interrupt:5 Base address:0xe400 

eth0:0 Link encap:Ethernet HWaddr 00:10:4C:25:7A:3F

         inet addr:192.168.10.12  Bcast:192.168.10.255  Mask:255.255.255.0
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
         Interrupt:5 Base address:0xe400 

eth0:1 Link encap:Ethernet HWaddr 00:10:4C:25:7A:3F

         inet addr:192.168.10.14  Bcast:192.168.10.255  Mask:255.255.255.0
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
         Interrupt:5 Base address:0xe400 

Config file: /etc/sysconfig/network-scripts/ifcfg-eth0:0

   DEVICE=eth0:0
   ONBOOT=yes
   BOOTPROTO=static
   BROADCAST=192.168.10.255
   IPADDR=192.168.10.12
   NETMASK=255.255.255.0
   NETWORK=192.168.10.0
   ONBOOT=yes

Aliases can also be shut down independently. i.e.: ifdown eth0:0

The option during kernel compile is: CONFIG_IP_ALIAS=y (Enabled by default in Redhat)