Bug 754086 - Patch NM to do a Prefix delegation query
Summary: Patch NM to do a Prefix delegation query
Keywords:
Status: CLOSED UPSTREAM
Alias: None
Product: Fedora
Classification: Fedora
Component: NetworkManager
Version: 16
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: ---
Assignee: Dan Williams
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2011-11-15 11:41 UTC by Tomasz Torcz
Modified: 2013-01-16 20:26 UTC (History)
4 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2013-01-16 20:26:59 UTC
Type: ---
Embargoed:


Attachments (Terms of Use)

Description Tomasz Torcz 2011-11-15 11:41:33 UTC
Description of problem:
dhclient as run by NM only does normal query for IPv6. It should also ask for Prefix Delegation.
Information obtained from PD can be utilised by dispatcher scripts, do not need to be handled in NM.


Version-Release number of selected component (if applicable):
NetworkManager-0.9.1.90-5.git20110927.fc16.x86_64

Something like this is needed:
--- a/src/dhcp-manager/nm-dhcp-dhclient.c
+++ b/src/dhcp-manager/nm-dhcp-dhclient.c
@@ -479,7 +479,7 @@ dhclient_start (NMDHCPClient *client,
 
 #if !defined(DHCLIENT_V3)
        if (ipv6) {
-               g_ptr_array_add (argv, (gpointer) "-6");
+               g_ptr_array_add (argv, (gpointer) "-6 -NP"); /* do a normal + Prefix Delegation query */
                if (mode_opt)
                        g_ptr_array_add (argv, (gpointer) mode_opt);
        } else {

Comment 1 Jiri Popelka 2011-12-08 12:55:47 UTC
Hi Tomasz,

I'm  not quite fond of this idea of mixing 'IP assignment' and 'prefix delegation mechanism'.
They both serve to other purposes and I'm not sure they can be *safely* used together.

For example RFC 3633 (IPv6 Prefix Options) says that when the delegating router (DHCPv6 server in our case) has no available prefixes it MUST send NoPrefixAvail status code in Advertise message.
That means that when you try (dhclient -N -P) to obtain IP address AND prefix from server that's not configured to delegate prefixes you will probably fail in getting IP address at all because of the NoPrefixAvail status.

--
Jiri

Comment 2 Jiri Popelka 2012-06-08 11:12:15 UTC
See also bug #830040.

Comment 3 Pavel Šimerda (pavlix) 2013-01-03 16:33:57 UTC
See upstream:

https://bugzilla.gnome.org/show_bug.cgi?id=593815

Comment 4 Fedora End Of Life 2013-01-16 13:07:51 UTC
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Comment 5 Pavel Šimerda (pavlix) 2013-01-16 20:26:59 UTC
This is a rather complex feature request for NetworkManager. Will be more suitable to track upstream:

https://bugzilla.gnome.org/show_bug.cgi?id=593815


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