.. _dummy-interface: ##### Dummy ##### The dummy interface is really a little exotic, but rather useful nevertheless. Dummy interfaces are much like the loopback interface, except you can have as many as you want. Dummy interfaces can be used as interfaces that always stay up (in the same fashion to loopbacks in Cisco IOS), or for testing purposes. Configuration ############# Address ------- .. cfgcmd:: set interfaces dummy address
Configure dummy interface `` with one or more interface addresses. * **address** can be specified multiple times as IPv4 and/or IPv6 address, e.g. 192.0.2.1/24 and/or 2001:db8::1/64 * **dhcp** interface address is received by DHCP from a DHCP server on this segment. * **dhcpv6** interface address is received by DHCPv6 from a DHCPv6 server on this segment. Example: .. code-block:: none set interfaces dummy dum10 address 192.0.2.1/24 set interfaces dummy dum10 address 192.0.2.2/24 set interfaces dummy dum10 address 2001:db8::ffff/64 set interfaces dummy dum10 address 2001:db8:100::ffff/64 Link Administration ------------------- .. cfgcmd:: set interfaces dummy description Assign given `` to interface. Description will also be passed to SNMP monitoring systems. .. cfgcmd:: set interfaces dummy disable Disable given ``. It will be placed in administratively down state. Operation ========= .. opcmd:: show interfaces dummy Show brief interface information.information .. code-block:: none vyos@vyos:~$ show interfaces dummy Codes: S - State, L - Link, u - Up, D - Down, A - Admin Down Interface IP Address S/L Description --------- ---------- --- ----------- dum0 172.18.254.201/32 u/u .. opcmd:: show interfaces dummy Show detailed information on given `` .. code-block:: none vyos@vyos:~$ show interfaces ethernet eth0 dum0: mtu 1500 qdisc noqueue state UNKNOWN group default qlen 1000 link/ether 26:7c:8e:bc:fc:f5 brd ff:ff:ff:ff:ff:ff inet 172.18.254.201/32 scope global dum0 valid_lft forever preferred_lft forever inet6 fe80::247c:8eff:febc:fcf5/64 scope link valid_lft forever preferred_lft forever RX: bytes packets errors dropped overrun mcast 0 0 0 0 0 0 TX: bytes packets errors dropped carrier collisions 1369707 4267 0 0 0 0