<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: Andale Mono; font-size: 10pt; color: #000000'>In the test-case that you setup, the client is going to accept whichever packet gets there first. It could have just as easily got a packet from server 2 if that packet had arrived first. If you shut of server 1 long enough that the client's lease runs out, it will get an address from server 2. <div><br></div><div>There is no failover support yet in DHCPv6 (although there is a draft for it that is currently worming its way through the IETF). If you have a relay agent in the middle, you can set priorities on which server should have preference etc...<br><br><div><br></div><hr id="zwchr"><blockquote style="border-left:2px solid rgb(16, 16, 255);margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"><b>From: </b>"ameen shajahan" <ameen.shajahan@wipro.com><br><b>To: </b>dhcp-users@lists.isc.org<br><b>Sent: </b>Monday, April 9, 2012 5:59:37 AM<br><b>Subject: </b>DHCPv6 query<br><br>
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<p class="MsoNormal">Hi all,</p>
<p class="MsoNormal"> I need clarification for a below output.</p>
<p class="MsoNormal"> Consider the scenario, I have run two dhcpv6 servers in two different eservers.</p>
<p class="MsoNormal"> Server1 subnet is <span style="color:red"> 3ffe:501:ffff:105::15</span></p>
<p class="MsoNormal"><span style="color:red"> </span><span style="color:black">Server2 subnet is</span><span style="color:red"> 3ffe:501:ffff:116::15</span></p>
<p class="MsoNormal"><span style="color:red"> </span><span style="color:black">These two servers connected to 1 switch , from that switch its connected to Windows7PC(client)</span></p>
<p class="MsoNormal"><span style="color:black"> </span></p>
<p class="MsoNormal"><span style="color:black"> </span></p>
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<p class="MsoNormal"><span lang="EN-US"> Cisco switch</span></p>
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<p class="MsoNormal"><span lang="EN-US">Client(Windows7PC)</span></p>
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DHCPV6 server1</span></p>
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DHCPv6 server 2
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<p class="MsoNormal"> </p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"> Ran the two servers at a sametime , Client got the IPv6 address in the subnet range<span style="color:red">3ffe:501:ffff:105::15 not in 3ffe:501:ffff:116::15</span></p>
<p class="MsoNormal"><span style="color:red"> </span><span style="color:black">Then I stopped both the server , restarted both the servers again.</span></p>
<p class="MsoNormal"><span style="color:black"> Again Client getting the IPv6 address in the range 3ffe:501:ffff:105::14 not in 3ffe:501:ffff:116::15</span></p>
<p class="MsoNormal"><span style="color:black"> Conceptuall it could be correct , because client get a single IP address at a time.</span></p>
<p class="MsoNormal"><span style="color:black"> 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.</span></p>
<p class="MsoNormal"><span style="color:black"> Is there any priority following for assigning IPv6 address.</span></p>
<p class="MsoNormal"><span style="color:black"> What could be the reason .</span></p>
<p class="MsoNormal"><span style="color:black"> Please let me know.</span></p>
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<p class="MsoNormal" style="border:none;padding:0cm"><span style="color:black"> </span></p>
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<p class="MsoNormal"><span style="color:black">Output 1(IP assigned output)</span></p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Jan 13 03:22:30 ameen daemon.info dhcpd: Solicit message from fe80::c8b0:62f6:fd72:7074 port 546, transaction ID 0xDCE659</p>
<p class="MsoNormal">Jan 13 03:22:30 ameen daemon.debug dhcpd: <span style="color:red">
Picking pool address 3ffe:501:ffff:105::15</span></p>
<p class="MsoNormal">Jan 13 03:22:30 ameen daemon.info dhcpd: Sending Advertise to fe80::c8b0:62f6:fd72:7074 port 546</p>
<p class="MsoNormal">Jan 13 03:22:31 ameen daemon.info dhcpd: Request message from fe80::c8b0:62f6:fd72:7074 port 546, transaction ID 0xDCE659</p>
<p class="MsoNormal">Jan 13 03:22:31 ameen daemon.info dhcpd: Sending Reply to fe80::c8b0:62f6:fd72:7074 port 546</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Jan 13 03:23:25 ameen daemon.info dhcpd: Release message from fe80::c8b0:62f6:fd72:7074 port 546, transaction ID 0x74B40B</p>
<p class="MsoNormal">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.</p>
<p class="MsoNormal">Jan 13 03:23:25 ameen daemon.info dhcpd: Sending Reply to fe80::c8b0:62f6:fd72:7074 port 546</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"> </p>
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padding:0cm 0cm 1.0pt 0cm">
<p class="MsoNormal" style="border:none;padding:0cm"> </p>
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<p class="MsoNormal">Output2(unassigned IP output)</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">feb 20 03:56:05 ameen daemon.info dhcpd: Solicit message from fe80::c8b0:62f6:fd72:7074 port 546, transaction ID 0xDCE659</p>
<p class="MsoNormal">Feb 20 03:56:05 ameen daemon.debug dhcpd: <span style="color:red">
Picking pool address 3ffe:501:ffff:116::15</span></p>
<p class="MsoNormal">Feb 20 03:56:05 ameen daemon.info dhcpd: Sending Advertise to fe80::c8b0:62f6:fd72:7074 port 546</p>
<p class="MsoNormal">Feb 20 03:56:06 ameen daemon.notice dhcpd: SFR: Init = 1C71 UP = 9C95 LOW = 9C4C</p>
<p class="MsoNormal">Feb 20 03:56:06 ameen daemon.info dhcpd: Request message from fe80::c8b0:62f6:fd72:7074 port 546, transaction ID 0xDCE659</p>
<p class="MsoNormal">Feb 20 03:56:06 ameen daemon.debug dhcpd: <span style="color:red">
Discarding Request from fe80::c8b0:62f6:fd72:7074; not our server identifier (CLIENTID</span> 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:</p>
<p class="MsoNormal">Feb 20 03:56:17 ameen daemon.notice dhcpd: SFR: Init = 1C71 UP = 9C95 LOW = 9C4C</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Feb 20 03:57:01 ameen daemon.info dhcpd: Release message from fe80::c8b0:62f6:fd72:7074 port 546, transaction ID 0x74B40B</p>
<p class="MsoNormal">Feb 20 03:57:01 ameen daemon.debug dhcpd: <span style="color:red">
Discarding Release from fe80::c8b0:62f6:fd72:7074; not our server identifier (CLIENTID</span> 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:</p>
<p class="MsoNormal">Feb 20 03:57:12 ameen daemon.notice dhcpd: SFR: Init = 1C71 UP = 9C95 LOW = 9C4C</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Regards,</p>
<p class="MsoNormal">Ameen S</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"> </p>
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