Red Hat Bugzilla – Bug 982854
dhclient fails to reacquire IPv6 address after reboot
Last modified: 2015-02-17 11:02:10 EST
Description of problem:
dhclient fails to reinstall a DHCPv6 address after reboot. The dhclient-script gets called with REBIND6, and the REBIND6 handling simply exits if the old and new addresses are the same, without verifying that the interface actually already has the address installed.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Set up a IPv6 system requiring DHCPv6
2. Acquire a lease
No IPv6 service
Old lease should have been reconfirmed and resumed
Applies to a system using "network" as opposed to "NetworkManager"
(In reply to H. Peter Anvin from comment #0)
> dhclient-script gets called with REBIND6, and the REBIND6 handling simply
> exits if the old and new addresses are the same, without verifying that the
> interface actually already has the address installed.
That's correct I'd say. RENEW/REBIND are used to extend client's lease. It's supposed that client already has configured interface and there's no need to re-configure it in case the address in reply to RENEW/REBIND is the same.
What is strange is why the hell client sends REBIND after reboot ? It should send a CONFIRM message and the dhclient-script should be run with BOUND6 as a $reason.
Could you obtain some packed dump of the dhclient<->server communication after the reboot, for example with wireshark-gnome ?
(In reply to Jiri Popelka from comment #1)
> for example with wireshark-gnome ?
That's name of package, program is of course wireshark.
It doesn't look like it will let me do that, as dhclient connects to the low-level network interface bypassing the IP stack. I do not have any way to intercept connection anywhere upstream of this client.
(In reply to H. Peter Anvin, Intel from comment #3)
> It doesn't look like it will let me do that, as dhclient connects to the
> low-level network interface bypassing the IP stack.
Yes, it can be said so, but I've never had any problems capturing packets on a machine with running dhclient.
I tried but got an empty capture file.
Either way... presumably the better way rather than relying on the packet type is to simply look if the address is already configured on the interface?
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