[Bug 1510098] Re: /etc/network/interfaces ipv6 static gateway not set

[Bas Zoetekouw]

Exact same problem here.  Setup worked flawlessly in 15.04, but in 15.10 the default gateway isn't set.
After manually adding it, eveything works fine again.

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Title:
  /etc/network/interfaces ipv6 static gateway not set

Status in ifupdown package in Ubuntu:
  New

Bug description:
  After installing 15.10 ipv6 gateway not set on start up.  In 15.04 it
  worked fine

  andrej at nikel:~$ cat /etc/network/interfaces
  auto lo enp4s0

  iface lo inet loopback
  iface enp4s0 inet manual
  iface enp4s0 inet6 static
    address ----:200:8221::---
    netmask 64
    gateway ----198:20-----

  andrej at nikel:~$ ip -6 route
  -------0:8221::/64 dev enp4s0  proto kernel  metric 256  mtu 1500 pref medium
  fe80::/64 dev enp4s0  proto kernel  metric 256  mtu 1500 pref medium
  fe80::/64 dev lxcbr0  proto kernel  metric 256  pref medium
  fe80::/64 dev docker0  proto kernel  metric 256  pref medium

  3: enp4s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc pfifo_fast state UP group default qlen 1000
      link/ether ------7:98 brd ff:ff:ff:ff:ff:ff
      inet 10.0.4.1/8 brd 10.255.255.255 scope global enp4s0
         valid_lft forever preferred_lft forever
      inet6 ----200:8221::--/64 scope global
         valid_lft forever preferred_lft forever
      inet6 ---------15:17ff:fe9e:b798/64 scope global mngtmpaddr dynamic
         valid_lft 83024sec preferred_lft 11024sec
      inet6 fe80::215:17ff:fe9e:b798/64 scope link
         valid_lft forever preferred_lft forever

  andrej at nikel:~$ cat /etc/sysctl.conf
  net.ipv4.conf.default.rp_filter= 1
  net.ipv4.conf.all.rp_filter    = 1
  net.ipv4.tcp_syncookies        = 1

  net.ipv6.conf.all.use_tempaddr     = 2
  net.ipv6.conf.default.use_tempaddr = 2
  net.ipv6.conf.enp4s0.use_tempaddr  = 2

  andrej at nikel:/proc/sys/net/ipv6/conf/enp4s0$ for i in *; do echo -n "$i: " ; cat $i ; done
  accept_dad: 1
  accept_ra: 0
  accept_ra_defrtr: 1
  accept_ra_from_local: 0
  accept_ra_mtu: 1
  accept_ra_pinfo: 1
  accept_ra_rt_info_max_plen: 0
  accept_ra_rtr_pref: 1
  accept_redirects: 1
  accept_source_route: 0
  autoconf: 0
  dad_transmits: 1
  disable_ipv6: 0
  force_mld_version: 0
  force_tllao: 0
  forwarding: 0
  hop_limit: 64
  max_addresses: 16
  max_desync_factor: 600
  mc_forwarding: 0
  mldv1_unsolicited_report_interval: 10000
  mldv2_unsolicited_report_interval: 1000
  mtu: 1500
  ndisc_notify: 0
  proxy_ndp: 0
  regen_max_retry: 3
  router_probe_interval: 60
  router_solicitation_delay: 1
  router_solicitation_interval: 4
  router_solicitations: 3
  cat: stable_secret: Permission denied
  stable_secret: suppress_frag_ndisc: 1
  temp_prefered_lft: 86400
  temp_valid_lft: 604800
  use_tempaddr: 2

  Maybe related:
  https://bugs.launchpad.net/ubuntu/+source/miredo/+bug/1510047

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: ifupdown 0.7.54ubuntu1
  ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
  Uname: Linux 4.2.0-16-generic x86_64
  ApportVersion: 2.19.1-0ubuntu3
  Architecture: amd64
  Date: Mon Oct 26 14:41:55 2015
  JournalErrors:
   No journal files were found.
   -- No entries --
  SourcePackage: ifupdown
  UpgradeStatus: No upgrade log present (probably fresh install)

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