Package: ifupdown Version: 0.8.19 Severity: normal * Steps to reproduce: 1. Configure interface with a static ipv6 address
# cat /etc/network/interfaces.d/eth1 auto eth1 iface eth1 inet static 10.2.3.4 netmask 255.255.255.0 iface eth1 inet6 static address fd60:d925:aaaa::bbbb netmask 64 2. Restart networking service. Note that the address is assigned: # systemctl restart networking # ip -6 addr show dev eth1 inet6 fd60:d925:aaaa::bbbb/64 scope global valid_lft forever preferred_lft forever 3. Now unplug interface and restart networking service * Expected Results: - Networking service restarts successfully * Actual results - Networking service goes to failed state * Cause I think this line of code https://salsa.debian.org/debian/ifupdown/blob/master/inet6.defn#L98 causes ifup to fail if the interface is unplugged. In particular after unplug and restart, my ipv6 address is added as "tentative" and settle-dad.sh does not like it: # ip -6 addr show dev eth1 inet6 fd60:d925:aaaa::bbbb/64 scope global tentative valid_lft forever preferred_lft forever * Workaround: Put "dad-attempts 0" in the ipv6 stanza with static address. However, I would like to have the DAD capacbility. Would it be possible to set dad-attempts condionally i.e. add `nodad` also if the interface is unplugged https://salsa.debian.org/debian/ifupdown/blob/master/inet6.defn#L95 ? --- up and down scripts installed: /etc/network/if-down.d: total 4 -rwxr-xr-x 1 root root 332 Jun 2 2015 upstart lrwxrwxrwx 1 root root 32 Aug 9 00:23 wpasupplicant -> ../../wpa_supplicant/ifupdown.sh /etc/network/if-post-down.d: total 0 lrwxrwxrwx 1 root root 23 Jan 23 2017 avahi-daemon -> ../if-up.d/avahi-daemon lrwxrwxrwx 1 root root 32 Aug 9 00:23 wpasupplicant -> ../../wpa_supplicant/ifupdown.sh /etc/network/if-pre-up.d: total 0 lrwxrwxrwx 1 root root 32 Aug 9 00:23 wpasupplicant -> ../../wpa_supplicant/ifupdown.sh /etc/network/if-up.d: total 12 -rwxr-xr-x 1 root root 484 Jan 23 2017 avahi-daemon -rwxr-xr-x 1 root root 972 Mar 1 2018 openssh-server -rwxr-xr-x 1 root root 1483 Jun 2 2015 upstart lrwxrwxrwx 1 root root 32 Aug 9 00:23 wpasupplicant -> ../../wpa_supplicant/ifupdown.sh -- System Information: Debian Release: 9.6 APT prefers stable-updates APT policy: (500, 'stable-updates'), (500, 'stable-debug'), (500, 'stable') Architecture: amd64 (x86_64) Kernel: Linux 4.9.0-8-amd64 (SMP w/1 CPU core) Locale: LANG=en_CA.UTF-8, LC_CTYPE=en_CA.UTF-8 (charmap=UTF-8), LANGUAGE=en_CA.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) Versions of packages ifupdown depends on: ii adduser 3.115 ii init-system-helpers 1.48 ii iproute2 4.9.0-1+deb9u1 ii libc6 2.24-11+deb9u3 ii lsb-base 9.20161125 Versions of packages ifupdown recommends: ii isc-dhcp-client [dhcp-client] 4.3.5-3+deb9u1 Versions of packages ifupdown suggests: ii ppp 2.4.7-1+4 pn rdnssd <none> -- no debconf information