DHCP server

Configure DHCP server on RHEL9

yum install dhcp-server

In this example, server on subnet 167 (129.57.167.139), and client on subnet 86.

#
# DHCP Server Configuration file.
#   see /usr/share/doc/dhcp*/dhcpd.conf.example
#   see dhcpd.conf(5) man page
#

option domain-name "jlab.org";
option domain-name-servers 129.57.90.255, 129.57.32.101;
default-lease-time 600;
max-lease-time 7200;

## subnet 167
subnet 129.57.167.0 netmask 255.255.255.0 {
      option routers 129.57.167.99;
      deny unknown-clients;
}

# subnet 86
subnet 129.57.86.0 netmask 255.255.255.0 {
      option broadcast-address 129.57.86.255;
      option subnet-mask 255.255.255.0;
      option routers 129.57.86.1;
      deny unknown-clients;
      allow declines;
}

# DISKLESS Clients in here
group
{
# in following, "if substring(vendorclass..." is for use in computer center environment only
#    if substring(vendorclass, 0, 9)="PXEClient" {
        if pxetype=00:06 or pxetype=00:07 {
            filename   "efi/boot/grub2/x86_64-efi/core.efi";
        } else {
            filename "linux-install/pxelinux.0";
        }
#    }

    next-server 129.57.167.139;

    host test333 {
        hardware ethernet 00:20:38:04:3a:8a;
        fixed-address 129.57.86.7;
    }

} # Diskless clients group

Configure local DHCP server on RHEL7

yum install dhcp

Config file /etc/dhcp/dhcpd.conf should looks like this:

#
# DHCP Server Configuration file.
#   see /usr/share/doc/dhcp*/dhcpd.conf.example
#   see dhcpd.conf(5) man page
#

subnet 192.168.10.0 netmask 255.255.255.0 {
        option domain-name "clontest.com jlab.org";
        option domain-name-servers 192.168.10.1;
        option routers 192.168.10.1;
        use-host-decl-names true;
	pool {
	     range 192.168.10.2 192.168.10.20;
	     deny dynamic bootp clients;
	     allow unknown clients;
	     }
}

set vendorclass = option vendor-class-identifier;
option pxe-system-type code 93 = unsigned integer 16;
set pxetype = option pxe-system-type;

# DISKLESS Clients in here
group
{
	if substring(vendorclass, 0, 9)="PXEClient" {
	   if pxetype=00:06 or pxetype=00:07 {
	      filename   "efi/boot/grub2/x86_64-efi/core.efi";
	   } else {
	      filename "linux-install/pxelinux.0";
	   }
	}
  	next-server 192.168.10.1;

	host test5 {
	 hardware ethernet 00:20:38:10:14:f7;
	 fixed-address 192.168.10.5;
	}

	host test6 {
	 hardware ethernet 00:20:38:0A:07:D7;
	 fixed-address 192.168.10.6;
	}

	host test7 {
	 hardware ethernet 00:20:38:0F:2C:0D;
	 fixed-address 192.168.10.7;
	}

} # Diskless clients group

Enable and start service:

systemctl enable dhcpd
systemctl start dhcpd

Check service status, fix errors if any:

systemctl status dhcpd