VMware DHCP PXE Inconsistently

Hello,

We are trying to get PXE boot working in VMware.

I am seeing very inconsistency when i do PXE boot installation. Sometime it does get DHCP address and works and sometimes it does not and time out. Our DHCP server is running on a VM on the same subnet i am trying to PXE boot. I do see in logs on DHCP server that it is offering IPs when requested. However, sometime its just time out in VMware without sending a request to DHCP server. Any idea where to start from ?

This is my dhcp server config :-

[root@pscfpl86 log]# cat /etc/dhcp/dhcpd.conf

ddns-update-style interim;

allow booting;

allow bootp;

option domain-name "xxxx.xxxx";

option domain-name-servers ns1.xxx.xxx, ns2.xxxx.xxxx;

default-lease-time 21600;

max-lease-time 43200;

authoritative;

ignore client-updates;

set vendorclass = option vendor-class-identifier;

subnet 10.11.12.0 netmask 255.255.255.0 {

        option routers                  10.11.12.1;

        max-lease-time                  1800;

        min-lease-time                  1800;

        default-lease-time              1800;

        option domain-name-servers      10.11.12.1;

        option subnet-mask              255.255.255.0;

        option domain-name              "xxxx.xxxx";

        range dynamic-bootp             10.11.12.5 10.11.12.100;

        filename                        "pxelinux.0";

        next-server                      10.11.12.2;

}

And when i get DHCP request from a VM, i can see it in logs :-

[root@pscfpl86 log]# tail -f messages

Dec 27 08:45:50 pscfpl86 dhcpd: DHCPOFFER on 10.11.12.10 to 00:50:56:90:20:ab via ens224

Dec 27 08:45:50 pscfpl86 dhcpd: DHCPREQUEST for 10.11.12.10 (10.11.12.1) from 00:50:56:90:20:ab via ens224

Dec 27 08:45:50 pscfpl86 dhcpd: DHCPACK on 10.11.12.10 to 00:50:56:90:20:ab via ens224

Dec 27 08:46:04 pscfpl86 dhcpd: DHCPREQUEST for 10.11.12.10 from 00:50:56:90:20:ab via ens224