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Unable to Assign an IP Address to Loopback lo:1



I am having issues assigning an IP address to lo:1. I am trying to configure OSPF Unnumbered. Here is my configuration:

# cat /etc/network/interfaces
auto lo
iface lo inet loopback

auto lo:1
iface lo:1


  • Cumulus Linux, 2.2.x
  • Cumulus Linux, 2.5.x


Assign loopback IP addresses directly under lo in /etc/network/interfaces:

auto lo
iface lo inet loopback

Then continue configuring routing protocols in Quagga.

You can find more information in the Cumulus Linux Quick Start Guide.

Root Cause

Rather than creating the lo:N alias, python-ifupdown2 applies addresses from each configured lo:N to lo directly. This behavior may be different from other Linux distributions.


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