Package: apt-cacher-ng Version: 3.2-2 Severity: normal Tags: ipv6 apt-cacher-ng does not deal well with dual-stack failures. At home I regularly have trouble with my IPv6 connexions, which just hang. Most applications are able to recover from this and fallback to IPv4, which just works. This is therefore mostly transparent to users, at worst there's a slight delay during the switchover.
The way to deal with this is documented in RFC 8305 and is generally refered to as "happy eyeballs": https://en.wikipedia.org/wiki/Happy_Eyeballs In particular, when IPv6 fails, apt-cacher-ng fails with the mysterious: Err :3 https://deb.debian.org/debian buster/main amd64 emacs-bin-common amd64 1:26.1+1-3.2 Reading from proxy failed - select (115: Opération maintenant en cours) [IP : 192.168.0.3 3142] That error is in french, but I think it translates to "Operation currently in progress". The IP there (192.168.0.3) is the IP of the proxy. When IPv6 returns, apt-cacher-ng magically recovers. But note that it not only times out, it also totally fails during the IPv6 outage. Normal `apt` connexions without the proxy have no such problems and can fallback to IPv4 fairly quickly. -- Package-specific info: -- System Information: Debian Release: 10.1 APT prefers stable APT policy: (500, 'stable') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 4.19.0-6-amd64 (SMP w/2 CPU cores) Locale: LANG=fr_CA.UTF-8, LC_CTYPE=fr_CA.UTF-8 (charmap=UTF-8), LANGUAGE=fr_CA.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled Versions of packages apt-cacher-ng depends on: ii adduser 3.118 ii debconf [debconf-2.0] 1.5.71 ii dpkg 1.19.7 ii libbz2-1.0 1.0.6-9.2~deb10u1 ii libc6 2.28-10 ii libgcc1 1:8.3.0-6 ii liblzma5 5.2.4-1 ii libssl1.1 1.1.1d-0+deb10u1 ii libstdc++6 8.3.0-6 ii libsystemd0 241-7~deb10u1 ii libwrap0 7.6.q-28 ii lsb-base 10.2019051400 ii zlib1g 1:1.2.11.dfsg-1 apt-cacher-ng recommends no packages. Versions of packages apt-cacher-ng suggests: ii avahi-daemon 0.7-4+b1 ii doc-base 0.10.8 ii libfuse2 2.9.9-1 -- Configuration Files: /etc/apt-cacher-ng/acng.conf changed: CacheDir: /var/cache/apt-cacher-ng LogDir: /var/log/apt-cacher-ng SupportDir: /usr/lib/apt-cacher-ng Remap-debrep: file:deb_mirror*.gz /debian ; file:backends_debian # Debian Archives Remap-uburep: file:ubuntu_mirrors /ubuntu ; file:backends_ubuntu # Ubuntu Archives Remap-cygwin: file:cygwin_mirrors /cygwin # ; file:backends_cygwin # incomplete, please create this file or specify preferred mirrors here Remap-sfnet: file:sfnet_mirrors # ; file:backends_sfnet # incomplete, please create this file or specify preferred mirrors here Remap-alxrep: file:archlx_mirrors /archlinux # ; file:backend_archlx # Arch Linux Remap-fedora: file:fedora_mirrors # Fedora Linux Remap-epel: file:epel_mirrors # Fedora EPEL Remap-slrep: file:sl_mirrors # Scientific Linux Remap-gentoo: file:gentoo_mirrors.gz /gentoo ; file:backends_gentoo # Gentoo Archives Remap-secdeb: security.debian.org ; security.debian.org deb.debian.org/debian-security ReportPage: acng-report.html ExThreshold: 4 LocalDirs: acng-doc /usr/share/doc/apt-cacher-ng PassThroughPattern: .* # allow CONNECT to everything /etc/apt-cacher-ng/security.conf [Errno 13] Permission non accordée: '/etc/apt-cacher-ng/security.conf' -- debconf information: apt-cacher-ng/port: keep apt-cacher-ng/gentargetmode: No automated setup apt-cacher-ng/bindaddress: keep apt-cacher-ng/proxy: keep apt-cacher-ng/tunnelenable: false apt-cacher-ng/cachedir: keep
