Can ISC DHCPd Failover work with PXE Boot?

CyberIT · 06-09-2017, 04:18 PM

Good Afternoon!

Im trying to configure DHCPd with Failover and PXE Boot...
What does the following two options actually do for DHCPd and does it work with failover?

allow booting;
allow bootp;

Im trying to configure DHCPd Failover and from what Im reading Im not quite sure if DHCP scopes that need PXE boot will work with DHCPd Failover. I believe the two options listed above would be needed but I dont know. If so, should they be added in the primary and secondary dhcpd.conf files or the dhcpd.master?

Also the two options below -- are they also needed and should they be added in the primary and secondary dhcpd.conf files or the dhcpd.master too?

next-server x.x.x.x;
filename "xxx";

Thanks in advance!

Primary dhcpd.conf file

Code:

#authoritative;
ddns-update-style none;
ignore client-updates;
one-lease-per-client true;
omapi-port 7911;

#Failover peer section
failover peer "dhcp-partner" {
  primary;
  address server1.paychex.com;
  port 647;
  peer address server2.paychex.com;
  peer port 647;
  max-response-delay 60;
  max-unacked-updates 10;
  mclt 3600;
  split 153;
  load balance max seconds 3;
}
include "/etc/dhcp/dhcpd.master";

Secondary dhcpd.conf file

Code:

#authoritative;
ddns-update-style none;
ignore client-updates;
one-lease-per-client true;
omapi-port 7911;

#Failover peer section
failover peer "dhcp-partner" {
  secondary;
  address server2.paychex.com;
  port 647;
  peer address server1.paychex.com;
  peer port 647;
  max-response-delay 60;
  max-unacked-updates 10;
  load balance max seconds 3;
}
include "/etc/dhcp/dhcpd.master";

dhcpd.master file

Code:

option domain-name "example.com";
allow booting;
allow bootp;
next-server x.x.x.x;
filename "xxx";
option option-242 code 242 = string;

#dhcpd wants to listen on its own networks
subnet 10.8.4.0 netmask 255.255.252.0 {
  ignore unknown-clients;
}

#dhcpd wants to listen on its own network
subnet 10.4.8.0 netmask 255.255.252.0 {
  ignore unknown-clients;
}

#Scope [10.4.4.0] TEST PXE Boot
subnet 10.4.4.0 netmask 255.255.252.0 {
  option subnet-mask 255.255.252.0;
  option routers 10.4.4.1;
  option domain-name-servers 10.2.2.198;
  pool {
    failover peer "dhcp-partner";
    default-lease-time 300;
    max-lease-time 360;
    range 10.4.5.0 10.4.5.255;
  }
}

nini09 · 06-13-2017, 03:43 PM

The allow booting and allow bootp are relative to PXE. DHCP failover doesn't need it.
If your primary and second DHCP server use PXE booting, these two configuration should be included.