[Bug 1886809] [NEW] Pulse connect VPN exists because unwanted avahi network starts

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Sebastien Bacher (seb128):

Pulse VPNs exists very often because avahi enforces network
192.250.0.0/0 over tun0 interface.  The message error is:

rmon.error Unauthorized new route to 169.254.0.0/0.0.0.0 has been added
(conflicts with our route to 0.0.0.0), disconnecting (routemon.cpp:598)

No matter the options to skip avahi on /etc/default/avahi-daemon, it
always calls /etc/network/if-up.d/avahi-autoipd and raises this
discovery network.

A fix can be done patching /etc/network/if-up.d/avahi-autoipd to skip
any tunnel interface.

--- /etc/network/if-up.d/avahi-autoipd.dpkg-old 2020-07-08 13:25:41.834569800 +0200
+++ /etc/network/if-up.d/avahi-autoipd  2020-07-07 10:07:37.611118581 +0200
@@ -11,6 +11,10 @@
 
 [ -x /usr/sbin/avahi-autoipd ] || exit 0
 
+case "$IFACE" in
+       tun*) exit 0 ;;
+esac
+
 [ "$IFACE" != "lo" ] || exit 0
 case "$ADDRFAM" in
        inet) ;;

** Affects: avahi (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bionic focal patch
-- 
Pulse connect VPN exists because unwanted avahi network starts
https://bugs.launchpad.net/bugs/1886809
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