DHCPv6 query

ameen.shajahan at wipro.com ameen.shajahan at wipro.com
Mon Apr 9 09:59:37 UTC 2012


Hi all,
                I need clarification for a below output.
                Consider the scenario, I have run two dhcpv6 servers in two different eservers.
                Server1 subnet is  3ffe:501:ffff:105::15
                Server2 subnet is  3ffe:501:ffff:116::15
                These two servers connected to 1 switch , from that switch its connected to Windows7PC(client)




       Cisco switch



Client(Windows7PC)





[cid:image001.png at 01CD1664.B020C250][cid:image002.png at 01CD1664.B020C250]                DHCPV6 server1
[cid:image003.png at 01CD1664.B020C250]                DHCPv6 server 2


                Ran the two servers at a sametime , Client got the IPv6 address in the subnet range3ffe:501:ffff:105::15   not in 3ffe:501:ffff:116::15
                Then I stopped both the server , restarted both the servers again.
                Again Client getting the IPv6 address in the range 3ffe:501:ffff:105::14   not in 3ffe:501:ffff:116::15
                Conceptuall it could be correct , because client get a single IP address at a time.
                I would like to know , why its not assigning to this range(3ffe:501:ffff:116::15) eventhough I restarted both the servers 4 to 5 times.
                Is there any priority following for assigning IPv6 address.
                What could be the reason .
                Please let me know.

Output 1(IP assigned output)

Jan 13 03:22:30 ameen daemon.info dhcpd: Solicit message from fe80::c8b0:62f6:fd72:7074 port 546, transaction ID 0xDCE659
Jan 13 03:22:30 ameen daemon.debug dhcpd: Picking pool address 3ffe:501:ffff:105::15
Jan 13 03:22:30 ameen daemon.info dhcpd: Sending Advertise to fe80::c8b0:62f6:fd72:7074 port 546
Jan 13 03:22:31 ameen daemon.info dhcpd: Request message from fe80::c8b0:62f6:fd72:7074 port 546, transaction ID 0xDCE659
Jan 13 03:22:31 ameen daemon.info dhcpd: Sending Reply to fe80::c8b0:62f6:fd72:7074 port 546


Jan 13 03:23:25 ameen daemon.info dhcpd: Release message from fe80::c8b0:62f6:fd72:7074 port 546, transaction ID 0x74B40B
Jan 13 03:23:25 ameen daemon.info dhcpd: Client 00:01:00:01:14:d3:bd:62:90:fb:a6:ec:74:35 releases address 3ffe:501:ffff:105::15, which is not leased to it.
Jan 13 03:23:25 ameen daemon.info dhcpd: Sending Reply to fe80::c8b0:62f6:fd72:7074 port 546



Output2(unassigned IP output)

feb 20 03:56:05 ameen daemon.info dhcpd: Solicit message from fe80::c8b0:62f6:fd72:7074 port 546, transaction ID 0xDCE659
Feb 20 03:56:05 ameen daemon.debug dhcpd: Picking pool address 3ffe:501:ffff:116::15
Feb 20 03:56:05 ameen daemon.info dhcpd: Sending Advertise to fe80::c8b0:62f6:fd72:7074 port 546
Feb 20 03:56:06 ameen daemon.notice dhcpd: SFR: Init = 1C71 UP = 9C95 LOW = 9C4C
Feb 20 03:56:06 ameen daemon.info dhcpd: Request message from fe80::c8b0:62f6:fd72:7074 port 546, transaction ID 0xDCE659
Feb 20 03:56:06 ameen daemon.debug dhcpd: Discarding Request from fe80::c8b0:62f6:fd72:7074; not our server identifier (CLIENTID 00:01:00:01:14:d3:bd:62:90:fb:a6:ec:74:35, SERVERID 00:01:00:01:16:a2:5f:70:00:60:43:60:ca:99, server DUID 00:01:00:01:16:d4:80:52:00:60:43:
Feb 20 03:56:17 ameen daemon.notice dhcpd: SFR: Init = 1C71 UP = 9C95 LOW = 9C4C


Feb 20 03:57:01 ameen daemon.info dhcpd: Release message from fe80::c8b0:62f6:fd72:7074 port 546, transaction ID 0x74B40B
Feb 20 03:57:01 ameen daemon.debug dhcpd: Discarding Release from fe80::c8b0:62f6:fd72:7074; not our server identifier (CLIENTID 00:01:00:01:14:d3:bd:62:90:fb:a6:ec:74:35, SERVERID 00:01:00:01:16:a2:5f:70:00:60:43:60:ca:99, server DUID 00:01:00:01:16:d4:80:52:00:60:43:
Feb 20 03:57:12 ameen daemon.notice dhcpd: SFR: Init = 1C71 UP = 9C95 LOW = 9C4C




Regards,
Ameen S




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