IP Aliasing: Difference between revisions

IP Aliasing is the process of adding additional IP addresses to a single network interface.

Linux

Use the ip command to add or remove IP addresses from an interface.

# ip address add $ip/$mask dev $interface
# ip address del $ip/$mask dev $interface

To make it persistent, create a ifcfg script with the IP changes:

# cp /etc/sysconfig/network-scripts/ifcfg-eth0 /etc/sysconfig/network-scripts/ifcfg-eth0:0
# cat /etc/sysconfig/network-scripts/ifcfg-eth0:0
DEVICE=eth0:0
NAME=eth0:0
IPADDR=10.1.1.2
NETMASK=255.255.255.0
ONBOOT=yes

Ensure that there is no GATEWAY set in the ifcfg-eth0 file because it should be set in /etc/sysconfig/network.

FreeBSD

Under FreeBSD, to add an additional IP address (10.1.1.2, with a netmask of 255.255.255.0) to re0, run:

# ifconfig re0 10.1.1.2 netmask 255.255.255.255 alias

The changes above are not persistent and will not survive a reboot. Add the following to /etc/rc.conf to make it persistent:

# ifconfig_re0_alias0="10.1.1.2 netmask 255.255.255.255 alias"

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IP Aliasing: Difference between revisions

Latest revision as of 21:55, 14 June 2020

Linux

FreeBSD

Recent Changes

Recent Changes under Linux

Recent Changes under Guides

Ad-Free + Tracker-Free

@@ Line 2: / Line 2: @@
 == Linux ==
-To add an additional IP address to a network device, such as eth0:
+Use the {{code|ip}} command to add or remove IP addresses from an interface.
- ifconfig eth0:0 10.1.1.2 up
+{{highlight|lang=terminal|code=
+# ip address add $ip/$mask dev $interface
+# ip address del $ip/$mask dev $interface
+}}
 To make it persistent, create a ifcfg script with the IP changes:
- cp /etc/sysconfig/network-scripts/ifcfg-eth0 /etc/sysconfig/network-scripts/ifcfg-eth0:0
+{{highlight|lang=terminal|code=
- vi /etc/sysconfig/network-scripts/ifcfg-eth0:0
+# cp /etc/sysconfig/network-scripts/ifcfg-eth0 /etc/sysconfig/network-scripts/ifcfg-eth0:0
- DEVICE=eth0:0
+# cat /etc/sysconfig/network-scripts/ifcfg-eth0:0
- NAME=eth0:0
+DEVICE=eth0:0
- IPADDR=10.1.1.2
+NAME=eth0:0
- NETMASK=255.255.255.0
+IPADDR=10.1.1.2
- ONBOOT=yes
+NETMASK=255.255.255.0
+ONBOOT=yes
+}}
-Ensure that there is no gateway set in the ifcfg-eth0 file because it should be set in /etc/sysconfig/network.
+Ensure that there is no {{code|GATEWAY}} set in the {{code|ifcfg-eth0}} file because it should be set in {{code|/etc/sysconfig/network}}.
 == FreeBSD ==
-Under FreeBSD, to add an additional IP address (10.1.1.2, with a netmask of 255.255.255.0) to <code>re0</code>, run:
+Under FreeBSD, to add an additional IP address (10.1.1.2, with a netmask of 255.255.255.0) to {{code|re0}}, run:
- ifconfig re0 10.1.1.2 netmask 255.255.255.255 alias
+{{highlight|lang=terminal|code=
+# ifconfig re0 10.1.1.2 netmask 255.255.255.255 alias
+}}
-The changes above are not persistent and will not survive a reboot. Add the following to <code>[[/etc/rc.conf]]</code> to make it persistent:
+The changes above are not persistent and will not survive a reboot. Add the following to {{code|[[/etc/rc.conf]]}} to make it persistent:
- ifconfig_re0_alias0="10.1.1.2 netmask 255.255.255.255 alias"
+{{highlight|lang=terminal|code=
+# ifconfig_re0_alias0="10.1.1.2 netmask 255.255.255.255 alias"
+}}
 [[Category:FreeBSD]]
+{{Navbox Linux}}[[Category:Linux]]
+[[Category:Networking]]