-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 Hello,
As I'm not subscribed to this mailing-list, I'd appreciate it if you could Cc me on your replies. Thanks I've recently been spending quite a bit of time testing Network Manager's IPv6 support on Ubuntu as part of our ongoing effort of getting full IPv6 support for Oneiric. It's really looking good and Network Manager does a great job of handling all the possible use cases I have, except one small detail. I noticed yesterday that Network Manager uses a different DHCP lease file for each connection. I can understand why it's been done this way for DHCPv4 (makes it more readable and easier to cleanup) but that's unfortunately breaking DHCPv6 support. You're probably aware that with DHCPv6, "host" definitions on the server side are no longer tied to a MAC address but instead to a DUID. This DUID is defined in RFC 3315, section 9. http://www.ietf.org/rfc/rfc3315.txt Quoting part of this specific section: The DUID is carried in an option because it may be variable length and because it is not required in all DHCP messages. The DUID is designed to be unique across all DHCP clients and servers, and stable for any specific client or server - that is, the DUID used by a client or server SHOULD NOT change over time if at all possible; for example, a device's DUID should not change as a result of a change in the device's network hardware. The way the ISC dhclient works, it's looking for a default-duid field in its lease file. For example, on my machine I currently have: default-duid "\000\001\000\001\025\303}\370\000#\024\243\331\244"; This is fine as long as dhclient always uses the same lease file but it's sadly not the current behavior when used with Network Manager. The current behavior's IPv4 equivalent would be a changing MAC address for every single network defined in Network Manager, which is really problematic for system administrators who need to do per-host configuration with DHCPv6. I'd highly recommend Network Manager either uses /var/lib/dhcp/dhclient6.leases as its lease file or if you absolutely want to keep a separate lease file per connection, then use the following algorithm: 1) Check if /var/lib/dhcp/dhclient6.leases exists 1a) If it does, grab the DUID from it. 1b) If it doesn't, generate a new DUID and write it to /var/lib/dhcp/dhclient6.leases 2) Write that DUID to your per-connection lease file prior to starting dhclient Let me know if you have any question! Thanks - -- Stéphane Graber Ubuntu developer http://www.ubuntu.com -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iQIcBAEBCgAGBQJOMXD6AAoJEMY4l01keS1nqj0P/jOdcsu0dPSMJJaj2bM8+pkK S9aArH7qcY0KRnPiyHef2Y71F7wVtsDIpngnGn9/hRaAAS2BpOSXGhEDBsgWb1Sv 1mRAKw5RpBDfbXY6nNY431gj/pXsL0q0AnBSYmMZzKzSbQjpqPpIJAPZ48ba5g55 VPlWYR7Wlo/P7zSaFeQauXyD3zVkmU8cDtA+8wiN5iDK0ps86wmW1Z+IqYHGDg6u Q0vJPQf1VTEGl12weCZZvpZzjwSeJWU5bQ9YGBeDVRKGkbWwbn3bFb7wZZMxBYGE lQLguuYuh5y1Rysn6YfUizpcIpPFqbkSFGw/bsW8dKMtrXlmjnKwMEq9rPpRCru/ lDlsCT6Da7jsL/iamK2Yp15LQfJtMMz6Ke5YV803r1RguD9PauodRViSVjJ8044+ 0+/wGzFEF/Yts2RB4rB7NtRPv+VBxBkOOao4ljcqX3aRIm3yLBt7Vpv+kPgcE8l8 fqWmdxRT57EZyiGd+wYS+tswdda3ClqM9wYgNPfmYtSQGe3biiv5Tq75RBFLZgGi 878SbxUXlIOkW8ZG38bHIc2ujmbZIiSs6ATNLRcV6qFfhyupXevwtC+OJgSA1I+D 0NaFR3Os15AgkevDId/dIlgj40J1fmOJQhu9c5XOX/Cob3yHInPfzFR0QZKLDGqQ u4aCDzwK0+45zBuIFskW =YA4/ -----END PGP SIGNATURE----- _______________________________________________ networkmanager-list mailing list [email protected] http://mail.gnome.org/mailman/listinfo/networkmanager-list
