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<p class="MsoNormal">Hello all, my first post here, so please be gentle <span style="font-family:Wingdings">
J</span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have inherited 2 dhcp servers, one primary(dhcp-1) & one secondary(dhcp-2) running isc-dhcpd-4.2.4 on Ubuntu 14.0(Trusty)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We are having a few issues, and I cannot seem to figure out whats going on. I have a few questions, maybe someone can help me with.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoListParagraph">Is there a max limit to how many subnets can be used in the pools? As currently we are using just over 6000 subnets<o:p></o:p></p>
<p class="MsoListParagraph">Currently our secondary dhcp-server is always in recovery mode, not sure why?<o:p></o:p></p>
<p class="MsoListParagraph">Does it matter if a DISCOVER comes in on eth1 but OFFER goes out on eth0?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">My primary server /etc/dhcpd.conf file<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">authoritative;<o:p></o:p></p>
<p class="MsoNormal">log-facility local7;<o:p></o:p></p>
<p class="MsoNormal">option domain-name "dyn";<o:p></o:p></p>
<p class="MsoNormal">option domain-name-servers 172.30.64.210, 172.30.64.220;<o:p></o:p></p>
<p class="MsoNormal">default-lease-time 1200; <o:p></o:p></p>
<p class="MsoNormal">max-lease-time 3600; # 1h<o:p></o:p></p>
<p class="MsoNormal">include "/etc/dhcp/dhcpd_pools.conf";<o:p></o:p></p>
<p class="MsoNormal"># Include the primary configuration<o:p></o:p></p>
<p class="MsoNormal">include "/etc/dhcp/dhcpd_primary.conf";<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="text-indent:.5in">/etc/dhcp/dhcpd_primary has the following<o:p></o:p></p>
<p class="MsoNormal"> ## PRIMARY<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:.5in">failover peer "tdl-dhcp-failover" {<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:.5in"> primary; # declare this to be the primary server<o:p></o:p></p>
<p class="MsoNormal"> address 172.30.128.9;<o:p></o:p></p>
<p class="MsoNormal"> port 647;<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:.5in"> peer address 172.30.128.10;<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:.5in"> peer port 647;<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:.5in"> max-response-delay 30;<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:.5in"> max-unacked-updates 10;<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:.5in"> load balance max seconds 3;<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:.5in"> mclt 1800;<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:.5in"> split 128;<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:.5in">}<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Exert from dhcpd_pools file, starts like this….<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">subnet 10.32.0.0 netmask 255.255.255.0 {<o:p></o:p></p>
<p class="MsoNormal"> option routers 10.32.0.1;<o:p></o:p></p>
<p class="MsoNormal"> pool {<o:p></o:p></p>
<p class="MsoNormal"> failover peer "dhcp-failover";<o:p></o:p></p>
<p class="MsoNormal"> range 10.32.0.5 10.32.0.254;<o:p></o:p></p>
<p class="MsoNormal"> }<o:p></o:p></p>
<p class="MsoNormal">}<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">And finishes like this, with all the subnets in between…<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">subnet 10.57.255.0 netmask 255.255.255.0 {<o:p></o:p></p>
<p class="MsoNormal"> option routers 10.57.255.1;<o:p></o:p></p>
<p class="MsoNormal"> pool {<o:p></o:p></p>
<p class="MsoNormal"> failover peer "dhcp-failover";<o:p></o:p></p>
<p class="MsoNormal"> range 10.57.255.5 10.57.255.254;<o:p></o:p></p>
<p class="MsoNormal"> }<o:p></o:p></p>
<p class="MsoNormal">}<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Example Exert from logs on both serves of a client that could not get an IP<o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"><br>
<span style="background:white">from dhcp-1<span class="apple-converted-space"> </span></span><br>
<span style="background:white">Jan 27 18:30:31 dhcp-1 dhcpd: DHCPDISCOVER from fc:e9:98:bc:a8:7b (iPhone) via 10.50.170.1<span class="apple-converted-space"> </span></span><br>
<span style="background:white">Jan 27 18:30:31 dhcp-1 dhcpd: DHCPOFFER on 10.50.170.93 to fc:e9:98:bc:a8:7b (iPhone) via 10.50.170.1<span class="apple-converted-space"> </span></span><br>
<br>
<span style="background:white">from dhcp-2<span class="apple-converted-space"> </span></span><br>
<span style="background:white">Jan 27 18:53:55 dhcp-2 dhcpd: DHCPDISCOVER from fc:e9:98:bc:a8:7b via 10.50.170.1: peer holds all free leases<span class="apple-converted-space"> </span></span><br>
<span style="background:white">Jan 27 18:54:04 dhcp-2 dhcpd: DHCPDISCOVER from fc:e9:98:bc:a8:7b via 10.50.170.1: peer holds all free leases<span class="apple-converted-space"> <o:p></o:p></span></span></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Never see the ACK.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Any suggestion would be greatly appreciated.. :<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks…<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Rob <o:p></o:p></p>
<p class="MsoNormal">Montreal Canada<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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