A quick update -- This seems to be a timing issue, i.e. dhclient trying
to bind to the DHCPv6 port (UDP 546) on a link-local address when the
interface is not ready, but I am not sure. What I do know is that the
following patch to isc-dhcp-client 4.3.1 works around the problem:
--- a/common/socket.c
+++ b/common/socket.c
@@ -170,6 +170,11 @@
if ((info->flags & INTERFACE_STREAMS) == INTERFACE_UPSTREAM) {
*do_multicast = 0;
}
+
+ /*
+ * Wait a little before calling bind(). See LP #1447715.
+ */
+ sleep(5);
break;
#endif /* DHCPv6 */
With this patch dhclient -6 waits 5 seconds before attempting to bind(),
and that allows me to obtain an IPv6 address from the DHCPv6 server.
A machine running ArchLinux and network-manager 1.0 does not have this
problem of dhclient quitting after failing to bind(). Ubuntu 15.04 uses
network-manager 0.9.10.0 so this might be a problem with Network Manager
after all. We will have to wait and see until Ubuntu has Network Manager
1.0. In the meantime, I am all see with the above "workaround".
Cheers,
Eloy Paris.-
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https://bugs.launchpad.net/bugs/1447715
Title:
dhclient -6: Can't bind to dhcp address: Cannot assign requested
address
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