<div dir="auto">For troubleshooting take one of the CPE mac address (the CPE which is not getting an IP)and check your logs for that mac address if your server is responding. Better to take a trace using tcpdump.<div dir="auto">If the server is responding then you need to check if its reaching the relays. From relays to CPE.</div><div dir="auto">Note there are CPEs which misbehave. Even after getting the ack they send discover.</div><div dir="auto"><br></div><div dir="auto">Regards</div><div dir="auto">Abdul Khader </div></div><br><div class="gmail_quote"><div dir="ltr">On Mon, 17 Dec 2018, 17:19 Usman Ahmad <<a href="mailto:usman.hfd@gmail.com">usman.hfd@gmail.com</a> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div dir="ltr"><div dir="ltr">Dear All, <div><br></div><div>I have setup two isc-dhcp-server in fail-over mode and these were working fine since long. Just know i am facing issue that some of my customers CPEs keep sending the DHCP request and doesn't get the IP however from DHCP logs, i can see the complete DORA process. </div><div><br></div><div>Please note that both DHCP servers are connected to different Gateway Routers/DHCP relay servers. Since the same DHCP requests are coming from both relay agent so the both DHCP servers are replying to both relay agents. </div><div><br></div><div>i have isc-dhcp-server v 4.3.1-6 and following is configuration for one server. </div><div><br></div><div><div>ddns-update-style none;</div><div><br></div><div>DHCPDARGS="eth0 eth1";</div><div><br></div><div>option domain-name-servers xx.xx.xx.xx, yy.yy.yy.yy;</div><div><br></div><div>default-lease-time 86400;</div><div>max-lease-time 86400;</div><div><br></div><div>authoritative;</div><div><br></div><div>log-facility local7;</div><div><br></div><div>deny unknown-clients;</div><div><br></div><div>one-lease-per-client true;</div><div><br></div><div>failover peer "awasr-dhcp-partner" {</div><div> primary;</div><div> address 192.168.2.4;</div><div> port 519;</div><div> peer address 192.168.2.5;</div><div> peer port 520;</div><div> max-response-delay 60;</div><div> max-unacked-updates 10;</div><div> mclt 600;</div><div> split 128;</div><div> load balance max seconds 3;</div><div>}</div><div>omapi-port 7911;</div><div>omapi-key awasr_omapi_key;</div><div>key awasr_omapi_key {</div><div> algorithm hmac-md5;</div><div> secret "0asdASCjaeEasWDSAkasjdo/s890amsdASDASfdjka+1DM50=";</div><div>}</div><div><br></div><div>include "/etc/dhcp/vlans/customer-vlans.conf";</div><div><br></div><div><br></div><div># Sample configuration for a single subnect </div><div><br></div><div>shared-network 1230 {</div><div><br></div><div> option dhcp-parameter-request-list 60,43,3,6,15;</div><div> option vendor-class-identifier "<a href="http://dslforum.org" target="_blank" rel="noreferrer">dslforum.org</a>";</div><div> vendor-option-space UMPSYS;</div><div> option UMPSYS.acs-url "<a href="http://ump.awasr.com:10301/acs" target="_blank" rel="noreferrer">http://ump.awasr.com:10301/acs</a>";</div><div> option domain-name "<a href="http://awasr.com" target="_blank" rel="noreferrer">awasr.com</a>";</div><div><br></div><div>subnet 10.32.32.0 netmask 255.255.255.0 {</div><div> option routers 10.32.32.1;</div><div> pool {</div><div> failover peer "awasr-dhcp-partner";</div><div> range 10.32.32.25 10.32.32.252;</div><div> }</div><div> }</div><div># for static hosts</div><div>include "/etc/dhcp/vlans/1230-hosts.conf";</div><div>}</div></div><div><br></div><div><div dir="ltr" class="m_-3151494346228118220gmail_signature"><div><font size="2" face="georgia,serif"><em>--</em></font></div><div><font size="2" face="georgia,serif"><em>Regards,</em></font></div><div><font size="2" face="comic sans ms,sans-serif">Usman Ahmad</font></div></div></div></div></div></div>
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