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</o:shapelayout></xml><![endif]--></head><body lang=FR-CA link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'>Hi Rob, <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'>I can't help for issue on your interface problem but I think I can help with the performance.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'>I used to have performance problem with my failover setup and someone at ISC told me to change some value in the code to get debug information about memory usage.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'>Add this to the file "includes/dhcpd.h"<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>#if !defined (REPORT_HASH_PERFORMANCE)<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'># define REPORT_HASH_PERFORMANCE 1<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>#endif<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'>Compile and start the daemon and you should get something like this on screen and in the log:<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>dhcpd: DHCP name hash: Contents/Size (%): 106/401 (26%). Min/max: 0/2<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>dhcpd: DHCP code hash: Contents/Size (%): 106/254 (41%). Min/max: 0/1<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>dhcpd: NWIP name hash: Contents/Size (%): 11/17 (64%). Min/max: 0/2<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>dhcpd: NWIP code hash: Contents/Size (%): 11/17 (64%). Min/max: 0/1<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>dhcpd: FQDN name hash: Contents/Size (%): 8/13 (61%). Min/max: 0/2<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>dhcpd: FQDN code hash: Contents/Size (%): 8/13 (61%). Min/max: 0/1<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>dhcpd: VIVCO name hash: Contents/Size (%): 1/127 (0%). Min/max: 0/1<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>dhcpd: VIVCO code hash: Contents/Size (%): 1/127 (0%). Min/max: 0/1<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>dhcpd: VIVSO name hash: Contents/Size (%): 1/127 (0%). Min/max: 0/1<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>dhcpd: VIVSO code hash: Contents/Size (%): 1/127 (0%). Min/max: 0/1<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>dhcpd: ISC name hash: Contents/Size (%): 2/3 (66%). Min/max: 0/1<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>dhcpd: ISC code hash: Contents/Size (%): 2/3 (66%). Min/max: 0/1<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>dhcpd: Relay Agent name hash: Contents/Size (%): 5/11 (45%). Min/max: 0/1<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>dhcpd: Relay Agent code hash: Contents/Size (%): 5/11 (45%). Min/max: 0/1<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>dhcpd: Server-Config Option name hash: Contents/Size (%): 67/136 (49%). Min/max: 0/4<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>dhcpd: Server-Config Option code hash: Contents/Size (%): 67/136 (49%). Min/max: 0/1<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>dhcpd: data: hardware: no raw packet or lease is available<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>dhcpd: data: hardware: no raw packet or lease is available<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>dhcpd: data: hardware: no raw packet or lease is available<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>dhcpd: data: hardware: no raw packet or lease is available<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>dhcpd: data: hardware: no raw packet or lease is available<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>dhcpd: data: hardware: no raw packet or lease is available<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>dhcpd: Config file: /dhcpd/dhcpd.conf<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>dhcpd: Database file: /dhcpd/dhcpd.leases<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>dhcpd: PID file: /var/run/dhcpd.pid<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>dhcpd: Wrote 0 class decls to leases file.<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>dhcpd: Wrote 0 deleted host decls to leases file.<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>dhcpd: Wrote 0 new dynamic host decls to leases file.<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>dhcpd: Wrote 48578 leases to leases file.<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>dhcpd: Host HW hash: Contents/Size (%): 1420/22501 (6%). Min/max: 0/4<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>dhcpd: Host UID hash: No table.<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>dhcpd: Lease IP hash: Contents/Size (%): 70324/100003 (70%). Min/max: 0/5<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>dhcpd: Lease UID hash: Contents/Size (%): 8708/100003 (8%). Min/max: 0/3<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>dhcpd: Lease HW hash: Contents/Size (%): 9036/100003 (9%). Min/max: 0/3<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'>"Lease IP hash" is where you should look.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'>By default the server use a lease hash size value of 100003. I had over 350000 leases so I was exceeding that value and the server was very slow to start.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'>To change the size you must edit the file "includes/dhcpd.h" and find LEASE_HASH_SIZE and replace the value. This value must be a prime number (I used 400009).<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>-# define LEASE_HASH_SIZE 100003<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>+# define LEASE_HASH_SIZE 400009<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'>Compile and start again. That was the answer for me. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'>One other thing with the failover setup, the peer will always be in recover state when starting for the duration of the "MCLT" (time in second) in your failover definition (1800 in your case), so it will be in recover start for 30 minutes. I use 300 (5 minutes).<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'>Le texte aurait été plus facile à écrire en français mais comme la liste est en anglais et que ça peut aider d'autres personnes alors je me suis forcé. En espérant que ce soit clair pour toi !<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'>Denis Laventure<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'>Université du Québec à Chicoutimi<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=FR>De :</span></b><span lang=FR> dhcp-users-bounces@lists.isc.org [mailto:dhcp-users-bounces@lists.isc.org] <b>De la part de</b> Rob Morin<br><b>Envoyé :</b> 27 janvier 2016 20:12<br><b>À :</b> dhcp-users@lists.isc.org<br><b>Objet :</b> ISC-dhcp subnet limit?<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-US>Hello all, my first post here, so please be gentle </span><span lang=EN-US style='font-family:Wingdings'>J</span><span lang=EN-US><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>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></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>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></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoListParagraph><span lang=EN-US>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></span></p><p class=MsoListParagraph><span lang=EN-US>Currently our secondary dhcp-server is always in recovery mode, not sure why?<o:p></o:p></span></p><p class=MsoListParagraph><span lang=EN-US>Does it matter if a DISCOVER comes in on eth1 but OFFER goes out on eth0?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>My primary server /etc/dhcpd.conf file<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>authoritative;<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>log-facility local7;<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>option domain-name "dyn";<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>option domain-name-servers 172.30.64.210, 172.30.64.220;<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>default-lease-time 1200; <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>max-lease-time 3600; # 1h<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>include "/etc/dhcp/dhcpd_pools.conf";<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US># Include the primary configuration<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>include "/etc/dhcp/dhcpd_primary.conf";<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal style='text-indent:36.0pt'><span lang=EN-US>/etc/dhcp/dhcpd_primary has the following<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> ## PRIMARY<o:p></o:p></span></p><p class=MsoNormal style='text-indent:36.0pt'><span lang=EN-US>failover peer "tdl-dhcp-failover" {<o:p></o:p></span></p><p class=MsoNormal style='text-indent:36.0pt'><span lang=EN-US> primary; # declare this to be the primary server<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> address 172.30.128.9;<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> port 647;<o:p></o:p></span></p><p class=MsoNormal style='text-indent:36.0pt'><span lang=EN-US> peer address 172.30.128.10;<o:p></o:p></span></p><p class=MsoNormal style='text-indent:36.0pt'><span lang=EN-US> peer port 647;<o:p></o:p></span></p><p class=MsoNormal style='text-indent:36.0pt'><span lang=EN-US> max-response-delay 30;<o:p></o:p></span></p><p class=MsoNormal style='text-indent:36.0pt'><span lang=EN-US> max-unacked-updates 10;<o:p></o:p></span></p><p class=MsoNormal style='text-indent:36.0pt'><span lang=EN-US> load balance max seconds 3;<o:p></o:p></span></p><p class=MsoNormal style='text-indent:36.0pt'><span lang=EN-US> mclt 1800;<o:p></o:p></span></p><p class=MsoNormal style='text-indent:36.0pt'><span lang=EN-US> split 128;<o:p></o:p></span></p><p class=MsoNormal style='text-indent:36.0pt'><span lang=EN-US>}<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Exert from dhcpd_pools file, starts like this….<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>subnet 10.32.0.0 netmask 255.255.255.0 {<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> option routers 10.32.0.1;<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> pool {<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> failover peer "dhcp-failover";<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> range 10.32.0.5 10.32.0.254;<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> }<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>}<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>And finishes like this, with all the subnets in between…<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>subnet 10.57.255.0 netmask 255.255.255.0 {<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> option routers 10.57.255.1;<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> pool {<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> failover peer "dhcp-failover";<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> range 10.57.255.5 10.57.255.254;<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> }<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>}<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Example Exert from logs on both serves of a client that could not get an IP<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US 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> </span></span></span><span class=apple-converted-space><span style='font-size:10.0pt;font-family:"Courier New";color:black;background:white'><o:p></o:p></span></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-US>Never see the ACK.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Any suggestion would be greatly appreciated.. :<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Thanks…<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Rob <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Montreal Canada<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div></body></html>