Package: ifupdown
Version: 0.8.37
Severity: important
X-Debbugs-Cc: e...@mcom.com

Dear Maintainer,

I have installed Sid in a virtual-machine using virt-manager to create
it. I discovered that both Claws Mail and Thunderbird will not connect
to imap.comcast.net (default is SSL/TLS). virt-manager creates virtual
machines with IPv4 networking by default, IPv6 is not enabled. 

It is not possible to disable IPv6 in Claws Mail, but if I disable IPv6
in Thunderbird using its config editor, Thunderbird will then
successfully connect to it.

I posted a message on Debian User Forums about this (link below) and it was
suggested to file a bug report. I'm not sure if ifupdown is the correct
package causing this issue, or if it's another package, or if it's with 
the IMAP server itself.

Please note that I am not having this issue with Debian Stable or Debian
Testing (also in separate virtual machines), only with Sid.

https://forums.debian.net/viewtopic.php?f=5&t=152455

Thank you.



-- Package-specific info:
--- /etc/network/interfaces:
source-directory /etc/network/interfaces.d

--- /etc/network/interfaces.d/setup:
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet dhcp

--- up and down scripts installed:
/etc/network/if-down.d:
total 4
-rwxr-xr-x 1 root root 1015 Feb  6  2021 avahi-autoipd
lrwxrwxrwx 1 root root   32 May 15 06:22 wpasupplicant -> 
../../wpa_supplicant/ifupdown.sh

/etc/network/if-post-down.d:
total 4
-rwxr-xr-x 1 root root 1409 Mar  7  2020 wireless-tools
lrwxrwxrwx 1 root root   32 May 15 06:22 wpasupplicant -> 
../../wpa_supplicant/ifupdown.sh

/etc/network/if-pre-up.d:
total 8
-rwxr-xr-x 1 root root 4191 Mar  7  2020 wireless-tools
lrwxrwxrwx 1 root root   32 May 15 06:22 wpasupplicant -> 
../../wpa_supplicant/ifupdown.sh

/etc/network/if-up.d:
total 4
-rwxr-xr-x 1 root root 923 Feb  6  2021 avahi-autoipd
lrwxrwxrwx 1 root root  32 May 15 06:22 wpasupplicant -> 
../../wpa_supplicant/ifupdown.sh


-- System Information:
Debian Release: bookworm/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 5.18.0-2-amd64 (SMP w/2 CPU threads; PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages ifupdown depends on:
ii  adduser   3.122
ii  iproute2  5.18.0-1
ii  libc6     2.33-8
ii  lsb-base  11.2

Versions of packages ifupdown recommends:
ii  isc-dhcp-client [dhcp-client]  4.4.3-2

Versions of packages ifupdown suggests:
pn  ppp     <none>
pn  rdnssd  <none>

-- no debconf information

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