Package: ifupdown
Version: 0.8.35+b1
Severity: normal

Dear Maintainer,

*** Reporter, please consider answering these questions, where appropriate ***

   * What led up to the situation?

IPv6 DAD "fails" on br0. ifupdown then terminates the PPPoE client running on 
eth3 [eth3 is not part of br0]


   * What exactly did you do (or not do) that was effective (or
     ineffective)?
   * What was the outcome of this action?
   * What outcome did you expect instead?
I expect that failure to bring up one interface will not cause the ifupdown to 
terminate pppd on a different interface. 


*** End of the template - remove these template lines ***


-- Package-specific info:
--- /etc/network/interfaces:
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback


# from https://wiki.debian.org/BridgeNetworkConnections

#iface eth7 inet manual
# br0, LAN
auto br0
iface br0 inet static
        bridge_ports eth7 enp3s0f0 enp3s0f1 enp4s0f0 enp4s0f1
                address 192.168.1.3
                netmask 255.255.255.0
                bridge_stp on
#               bridge_maxwait 0
#               bridge_fd 0

iface br0 inet6 static
        address 2001:db8::1
        netmask 64
        dad-attempts 0
        # without the above, br0 will fail to come up



## eth3, connected to NTE

auto ppp0
iface ppp0 inet ppp
        pre-up /bin/ip link set eth3 mtu 1508
        pre-up /bin/ip link set eth3 up
        provider provider
        post-up sh /root/firewall/delayed-post-up.sh
#       post-up sleep 10

--- up and down scripts installed:
/etc/network/if-down.d:
total 4
-rwxr-xr-x 1 root root 289 Jan 17  2018 bind9

/etc/network/if-post-down.d:
total 0
lrwxrwxrwx 1 root root 29 Jan 27  2019 bridge -> /lib/bridge-utils/ifupdown.sh

/etc/network/if-pre-up.d:
total 4
lrwxrwxrwx 1 root root  29 Jan 27  2019 bridge -> /lib/bridge-utils/ifupdown.sh
-rwxr-xr-x 1 root root 344 Jun  7  2010 ethtool

/etc/network/if-up.d:
total 16
-rwxr-xr-x 1 root root  289 Jan 17  2018 bind9
-rwxr-xr-x 1 root root 1685 Sep 22  2014 ethtool
-rwxr-xr-x 1 root root 4937 Aug 22 16:39 mountnfs


-- System Information:
Debian Release: bullseye/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.2.0-3-amd64 (SMP w/4 CPU cores)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE, 
TAINT_UNSIGNED_MODULE
Locale: LANG=en_GB, LC_CTYPE=en_GB (charmap=ISO-8859-1), 
LANGUAGE=en_GB:en_US:en_GB:en (charmap=ISO-8859-1)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages ifupdown depends on:
ii  adduser   3.118
ii  iproute2  5.3.0-1
ii  libc6     2.29-2
ii  lsb-base  11.1.0

Versions of packages ifupdown recommends:
pn  isc-dhcp-client | dhcp-client  <none>

Versions of packages ifupdown suggests:
ii  ppp     2.4.7-2+4.1+b1
pn  rdnssd  <none>

-- Configuration Files:
/etc/default/networking changed:
VERBOSE=yes


-- debconf information:
  ifupdown/convert-interfaces: true

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