touch-packages team mailing list archive

[Graham Clinch <g.clinch@xxxxxxxxxxxxxxx>]

Adding '-tentative' to the ip call in /lib/ifupdown/wait-for-ll6.sh
corrects this issue for me:

--- /lib/ifupdown/wait-for-ll6.sh.old	2016-02-08 23:58:02.341820711 +0000
+++ /lib/ifupdown/wait-for-ll6.sh	2016-02-09 00:01:18.128000560 +0000
@@ -4,7 +4,7 @@
 delay=${IF_LL_INTERVAL:-0.1}
 
 for attempt in $(seq 1 $attempts); do
-	lladdress=$(ip -6 -o a s dev "$IFACE" scope link)
+	lladdress=$(ip -6 -o a s dev "$IFACE" scope link -tentative)
 	if [ -n "$lladdress" ]; then
 		attempt=0
 		break


(-tentative is "only list addresses which are not in the process of duplicate address detection currently")

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Touch seeded packages, which is subscribed to ifupdown in Ubuntu.
https://bugs.launchpad.net/bugs/1543352

Title:
  inet6 dhcp doesn't wait for link-local address to leave tentative -
  dhclient fails to bind

Status in ifupdown package in Ubuntu:
  New

Bug description:
  =
  Description:	Ubuntu Xenial Xerus (development branch)
  Release:	16.04

  ifupdown:
    Installed: 0.8.10ubuntu1
    Candidate: 0.8.10ubuntu1
  =

  With an /etc/network/interfaces file containing:

  auto eno16780032
  iface eno16780032 inet dhcp
  iface eno16780032 inet6 dhcp

  On boot, ifup starts 'dhclient -6' before the link local address has
  completed Duplicate Address Discovery (the address is marked
  'tentative').  In turn, dhclient reports 'Can't bind to dhcp address:
  Cannot assign requested address', and fails almost immediately.

  It would seem that either wait-for-ll6.sh should wait for the link
  local address to come up AND stop being tentative, or the dhcp method
  for inet6 should call settle-dad.sh after wait-for-ll6?

  This is partly a race condition, so on slower devices the dad may
  complete by the time dhclient has got started, however I can regularly
  reproduce this on a virtual machine.

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