DHCP IP assignment issue - dhcp failover scenario

[Usman Ahmad]

Dear All,

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.

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.

i have isc-dhcp-server v 4.3.1-6 and following is configuration for one
server.

ddns-update-style none;

DHCPDARGS="eth0 eth1";

option domain-name-servers xx.xx.xx.xx, yy.yy.yy.yy;

default-lease-time 86400;
max-lease-time 86400;

authoritative;

log-facility local7;

deny unknown-clients;

one-lease-per-client true;

failover peer "awasr-dhcp-partner" {
         primary;
         address 192.168.2.4;
         port 519;
         peer address 192.168.2.5;
         peer port 520;
         max-response-delay 60;
         max-unacked-updates 10;
         mclt 600;
         split 128;
         load balance max seconds 3;
}
omapi-port 7911;
omapi-key awasr_omapi_key;
key awasr_omapi_key {
               algorithm hmac-md5;
               secret "0asdASCjaeEasWDSAkasjdo/s890amsdASDASfdjka+1DM50=";
}

include "/etc/dhcp/vlans/customer-vlans.conf";


# Sample configuration for a single subnect

shared-network 1230 {

        option dhcp-parameter-request-list 60,43,3,6,15;
        option vendor-class-identifier "dslforum.org";
        vendor-option-space UMPSYS;
        option UMPSYS.acs-url "http://ump.awasr.com:10301/acs";
        option domain-name "awasr.com";

subnet 10.32.32.0 netmask 255.255.255.0 {
        option routers 10.32.32.1;
        pool {
            failover peer "awasr-dhcp-partner";
            range 10.32.32.25 10.32.32.252;
        }
     }
# for static hosts
include "/etc/dhcp/vlans/1230-hosts.conf";
}

*--*
*Regards,*
Usman Ahmad
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