# Need help in configuring DHCP sever **URL:** \ **Category:** Rocky Linux Help & Support\ **Created:** [April 7, 2022, 11:18pm UTC](https://forums.rockylinux.org/t/need-help-in-configuring-dhcp-sever/5792 "2022-04-07T23:18:01Z")\ **Posts on this page:** 14\ **Page:** 1
**Author:** ![jgalt](https://avatars.discourse-cdn.com/v4/letter/j/439d5e/32.png) [@jgalt](https://forums.rockylinux.org/u/jgalt)\ **Post date:** [April 7, 2022, 11:18pm UTC](https://forums.rockylinux.org/t/need-help-in-configuring-dhcp-sever/5792/1 "2022-04-07T23:18:01Z")
I have installed Rocky 8.5 and currently struggling to setup the DHCP server for multiply NIC’s. My “server” is a plain vanilla desktop PC with 3 interface cards. 1 on the motherboard and the other two in expansion slots. This PC will be the head node for my Warewulf cluster. Any help will be welcomed. ---
**Author:** ![label](https://avatars.discourse-cdn.com/v4/letter/l/c5a1d2/32.png) [@label](https://forums.rockylinux.org/u/label)\ **Post date:** [April 8, 2022, 3:56pm UTC](https://forums.rockylinux.org/t/need-help-in-configuring-dhcp-sever/5792/2 "2022-04-08T15:56:17Z")
Assuming you are using the `dhcp-server` package, your subnet blocks will need interface designations. Otherwise what happens is dhcpd will listen on all ports. ```auto subnet 10.100.0.0 netmask 255.255.255.0 { interface br1000; ## Right here option routers 10.100.0.1; option domain-name-servers 10.100.0.1, 10.100.0.231; option domain-name "example.com"; option subnet-mask 255.255.255.0; range 10.100.0.110 10.100.0.199; ## EFI Client Catch class "pxeclients" { match if substring (option vendor-class-identifier, 0, 9) = "PXEClient"; if option pxe-system-type = 00:02 { filename "elilo.efi"; } else if option pxe-system-type = 00:07 { #filename "shim.efi"; filename "boot/grub2/x86_64-efi/core.efi"; } else if option pxe-system-type = 00:08 { #filename "shim.efi"; filename "boot/grub2/x86_64-efi/core.efi"; } else if option pxe-system-type = 00:09 { #filename "shim.efi"; filename "boot/grub2/x86_64-efi/core.efi"; } else if option pxe-system-type = 00:0a { filename "armv7.efi"; } else if option pxe-system-type = 00:0b { filename "grubaa64.efi"; } else { #filename "pxelinux.0"; filename "boot/grub2/i386-pc/core.0"; } } default-lease-time 21600; max-lease-time 43200; next-server 10.100.0.1; } ``` A bigger example using multiple interfaces (in my case, two bridges being served two different subnets): ```auto ddns-update-style interim; allow booting; allow bootp; authoritative;; log-facility local6; ignore client-updates; set vendorclass = option vendor-class-identifier; ## Allowing EFI Clients option pxe-system-type code 93 = unsigned integer 16; option rfc3442-classless-static-routes code 121 = array of integer 8; option ms-classless-static-routes code 249 = array of integer 8; option space pxelinux; option pxelinux.magic code 208 = string; option pxelinux.configfile code 209 = text; option pxelinux.pathprefix code 210 = text; option pxelinux.reboottime code 211 = unsigned integer 32; option architecture-type code 93 = unsigned integer 16; option pxelinux.mtftp-ip code 1 = ip-address; option pxelinux.mtftp-cport code 2 = unsigned integer 16; option pxelinux.mtftp-sport code 3 = unsigned integer 16; option pxelinux.mtftp-tmout code 4 = unsigned integer 8; option pxelinux.mtftp-delay code 5 = unsigned integer 8; subnet 10.100.0.0 netmask 255.255.255.0 { interface br1000; ## Right here option routers 10.100.0.1; option domain-name-servers 10.100.0.1, 10.100.0.231; option domain-name "example.com"; option subnet-mask 255.255.255.0; range 10.100.0.110 10.100.0.199; ## EFI Client Catch class "pxeclients" { match if substring (option vendor-class-identifier, 0, 9) = "PXEClient"; if option pxe-system-type = 00:02 { filename "elilo.efi"; } else if option pxe-system-type = 00:07 { #filename "shim.efi"; filename "boot/grub2/x86_64-efi/core.efi"; } else if option pxe-system-type = 00:08 { #filename "shim.efi"; filename "boot/grub2/x86_64-efi/core.efi"; } else if option pxe-system-type = 00:09 { #filename "shim.efi"; filename "boot/grub2/x86_64-efi/core.efi"; } else if option pxe-system-type = 00:0a { filename "armv7.efi"; } else if option pxe-system-type = 00:0b { filename "grubaa64.efi"; } else { #filename "pxelinux.0"; filename "boot/grub2/i386-pc/core.0"; } } default-lease-time 21600; max-lease-time 43200; next-server 10.100.0.1; } subnet 10.100.1.0 netmask 255.255.255.0 { interface br1001; option routers 10.100.1.1; option domain-name-servers 10.100.0.1, 10.100.0.231; option domain-name "example.com"; option subnet-mask 255.255.255.0; range 10.100.1.200 10.100.1.254; ## EFI Client Catch class "pxeclients" { match if substring (option vendor-class-identifier, 0, 9) = "PXEClient"; if option pxe-system-type = 00:02 { filename "elilo.efi"; } else if option pxe-system-type = 00:07 { #filename "shim.efi"; filename "boot/grub2/x86_64-efi/core.efi"; } else if option pxe-system-type = 00:08 { #filename "shim.efi"; filename "boot/grub2/x86_64-efi/core.efi"; } else if option pxe-system-type = 00:09 { #filename "shim.efi"; filename "boot/grub2/x86_64-efi/core.efi"; } else if option pxe-system-type = 00:0a { filename "armv7.efi"; } else if option pxe-system-type = 00:0b { filename "grubaa64.efi"; } else { #filename "pxelinux.0"; filename "boot/grub2/i386-pc/core.0"; } } default-lease-time 21600; max-lease-time 43200; next-server 10.100.1.1; } ``` ---
**Author:** ![jlehtone](https://avatars.discourse-cdn.com/v4/letter/j/e9a140/32.png) [@jlehtone](https://forums.rockylinux.org/u/jlehtone)\ **Post date:** [April 8, 2022, 4:06pm UTC](https://forums.rockylinux.org/t/need-help-in-configuring-dhcp-sever/5792/3 "2022-04-08T16:06:07Z")
The dhcp-server has many features, but for simple network `dnsmasq` is probably sufficient. This is from config of dnsmasq. One can set multiple domain, interface, and listen-address. ```auto # Ansible managed # domain-needed bogus-priv expand-hosts domain=admin,10.0.0.0/24,local interface=admin listen-address=10.0.0.1 addn-hosts=/etc/ourhosts # DHCP pool setup dhcp-range=set:admin,10.0.0.200,10.0.0.240,12h dhcp-option=tag:admin,option:router,10.0.0.1 ``` One can also set with `dhcp-host` options predictable (aka static) IP addresses for clients. The best part is that dnsmasq is both DHCP and DNS server (and TFTP server), so integration of DHCP and DNS (the “ddns-update-style”) is seamless. (With TFTP server enabled one has PXEboot server for easier installs of cluster nodes). ---
**Author:** ![jgalt](https://avatars.discourse-cdn.com/v4/letter/j/439d5e/32.png) [@jgalt](https://forums.rockylinux.org/u/jgalt)\ **Post date:** [April 9, 2022, 8:40pm UTC](https://forums.rockylinux.org/t/need-help-in-configuring-dhcp-sever/5792/4 "2022-04-09T20:40:57Z")
Unfortunately neither option seem to work. Here is the current error messages. [root@localhost warewulf]# wwctl configure --all Enabling and restarting the DHCP services Job for dhcpd.service failed because the control process exited with error code. See “systemctl status dhcpd.service” and “journalctl -xe” for details. [ERROR] : failed to start: failed to run start cmd: exit status 1 root@localhost warewulf]# systemctl status dhcpd.service ● dhcpd.service - DHCPv4 Server Daemon Loaded: loaded (/usr/lib/systemd/system/dhcpd.service; disabled; vendor preset: disabled) Active: failed (Result: exit-code) since Sat 2022-04-09 16:27:33 EDT; 4min 53s ago Docs: man:dhcpd(8) man:dhcpd.conf(5) Process: 3345 ExecStart=/usr/sbin/dhcpd -f -cf /etc/dhcp/dhcpd.conf -user dhcpd -group dhcpd --no-pid $DHCPDARGS (code=exited, status=1/FAILURE) Main PID: 3345 (code=exited, status=1/FAILURE) Apr 09 16:27:33 localhost.localdomain dhcpd[3345]: have been made to the base software release in order to make Apr 09 16:27:33 localhost.localdomain dhcpd[3345]: it work better with this distribution. Apr 09 16:27:33 localhost.localdomain dhcpd[3345]: Apr 09 16:27:33 localhost.localdomain dhcpd[3345]: Please report issues with this software via: Apr 09 16:27:33 localhost.localdomain dhcpd[3345]: [https://bugs.rockylinux.org/](https://bugs.rockylinux.org/) Apr 09 16:27:33 localhost.localdomain dhcpd[3345]: Apr 09 16:27:33 localhost.localdomain systemd[1]: dhcpd.service: Main process exited, code=exited, status=1/FAILURE Apr 09 16:27:33 localhost.localdomain dhcpd[3345]: exiting. Apr 09 16:27:33 localhost.localdomain systemd[1]: dhcpd.service: Failed with result ‘exit-code’. Apr 09 16:27:33 localhost.localdomain systemd[1]: Failed to start DHCPv4 Server Daemon. Logs: [root@localhost /]# wwctl server status Warewulf server is running at PID: 1410 [root@localhost /]# tail /var/log/warewulfd.log [Sat Apr 9 15:15:58 EDT 2022] Starting HTTPD REST service on port 9873 [Sat Apr 9 15:41:41 EDT 2022] Starting HTTPD REST service on port 9873 [Sat Apr 9 16:14:35 EDT 2022] Starting HTTPD REST service on port 9873 [Sat Apr 9 16:25:20 EDT 2022] Starting HTTPD REST service on port 9873 [root@localhost /]# wwctl server status Warewulf server is running at PID: 1410 ---
**Author:** ![jgalt](https://avatars.discourse-cdn.com/v4/letter/j/439d5e/32.png) [@jgalt](https://forums.rockylinux.org/u/jgalt)\ **Post date:** [April 10, 2022, 12:46am UTC](https://forums.rockylinux.org/t/need-help-in-configuring-dhcp-sever/5792/5 "2022-04-10T00:46:49Z")
I have the DHCP server up and running. Thanks ---
**Author:** ![jgalt](https://avatars.discourse-cdn.com/v4/letter/j/439d5e/32.png) [@jgalt](https://forums.rockylinux.org/u/jgalt)\ **Post date:** [April 15, 2022, 6:41pm UTC](https://forums.rockylinux.org/t/need-help-in-configuring-dhcp-sever/5792/6 "2022-04-15T18:41:40Z")
Okay, Back to the beginning. My head node computer , Rocky 8 and Warewulf installed, has the following NIC cards. 1. enp4S0 - on motherboard - Internet connection 192.168.4.10 2. enp3so - slot - 10.0.1.0 3. enp2s0 - slot - 10.0.2.0 I have the DHPCD.conf configured as below. # # DHCP Server Configuration file. # see /usr/share/doc/dhcp-server/dhcpd.conf.example # see dhcpd.conf(5) man page # # create new # specify domain name DHCPDARGS-enp2s0; option domain-name “localhost.localdomain”; # specify DNS server’s hostname or IP address option domain-name-servers 1.1.1.1, 8.8.8.8; # default lease time default-lease-time 600; # max lease time max-lease-time 7200; # this DHCP server to be declared valid authoritative; # specify network address and subnetmask subnet 10.0.1.0 netmask 255.255.255.0 { # specify the range of lease IP address range dynamic-bootp 10.0.1.40 10.0.1.120; # specify broadcast address option broadcast-address 10.0.1.255; # specify gateway option routers 10.0.1.1; filename “pxelinux.0”; } With this setting, I can boot the first node, connecting to it 's motherboard nic, and it will find an IPadress. However I receive the following TFTP warnings 1. PXE-T01 2. PXE-E3B 3. PXE -M0F If I modify the DHCPD.cond file as below I have an IP conflict and my internet connection goes down. # # DHCP Server Configuration file. # see /usr/share/doc/dhcp-server/dhcpd.conf.example # see dhcpd.conf(5) man page # # create new # specify domain name DHCPDARGS-enp2s0, enp3s0; option domain-name “localhost.localdomain”; # specify DNS server’s hostname or IP address option domain-name-servers 1.1.1.1, 8.8.8.8; # default lease time default-lease-time 600; # max lease time max-lease-time 7200; # this DHCP server to be declared valid authoritative; # specify network address and subnetmask subnet 10.0.1.0 netmask 255.255.255.0 { # specify the range of lease IP address range dynamic-bootp 10.0.1.40 10.0.1.120; # specify broadcast address option broadcast-address 10.0.1.255; # specify gateway option routers 10.0.1.1; filename “pxelinux.0”; subnet 10.0.2.0 netmask 255.255.255.0 { # specify the range of lease IP address range dynamic-bootp 10.0.2.40 10.0.2.120; # specify broadcast address option broadcast-address 10.0.2.255; # specify gateway option routers 10.0.2.1; filename “pxelinux.0”; } When I query for node status it respondes. [root@localhost warewulf]# wwctl node status [ERROR] : Could not connect to Warewulf server: Get “[http://192.168.200.1:9873/status](http://192.168.200.1:9873/status)”: dial tcp 192.168.200.1:9873: i/o timeout Where is the 192.168.200.1 adddress coming from? # [root@localhost warewulf]# wwctl node list NODE NAME PROFILES NETWORK n0000.cluster default default:10.0.1.40 n0001.cluster default default:– [root@localhost warewulf]# [root@localhost warewulf]# wwctl node list -a ################################################################################ NODE FIELD PROFILE VALUE n0000.cluster Id – n0000.cluster n0000.cluster Comment default This profile is automatically included for each node n0000.cluster Cluster – (cluster) n0000.cluster Profiles – default n0000.cluster Discoverable – true n0000.cluster Container default rocky-8 n0000.cluster KernelOverride default 4.18.0-348.20.1.el8\_5.x86\_64 n0000.cluster KernelArgs – (quiet crashkernel=no vga=791) n0000.cluster SystemOverlay – (wwinit) n0000.cluster RuntimeOverlay – (generic) n0000.cluster Ipxe – (default) n0000.cluster Init – (/sbin/init) n0000.cluster Root – (initramfs) n0000.cluster AssetKey – – n0000.cluster IpmiIpaddr – – n0000.cluster IpmiNetmask – – n0000.cluster IpmiPort – – n0000.cluster IpmiGateway – – n0000.cluster IpmiUserName – – n0000.cluster IpmiInterface – – n0000.cluster default:DEVICE – enp2s0 n0000.cluster default:HWADDR – 00:e0:53:17:8a:2d n0000.cluster default:IPADDR – 10.0.1.40 n0000.cluster default:IPADDR6 – – n0000.cluster default:NETMASK SUPERSEDED 255.255.255.0 n0000.cluster default:GATEWAY default 10.0.1.0 n0000.cluster default:TYPE – – n0000.cluster default:ONBOOT – true n0000.cluster default:DEFAULT – true ################################################################################ NODE FIELD PROFILE VALUE n0001.cluster Id – n0001.cluster n0001.cluster Comment default This profile is automatically included for each node n0001.cluster Cluster – (cluster) n0001.cluster Profiles – default n0001.cluster Discoverable – false n0001.cluster Container default rocky-8 n0001.cluster KernelOverride default 4.18.0-348.20.1.el8\_5.x86\_64 n0001.cluster KernelArgs – (quiet crashkernel=no vga=791) n0001.cluster SystemOverlay – (wwinit) n0001.cluster RuntimeOverlay – (generic) n0001.cluster Ipxe – (default) n0001.cluster Init – (/sbin/init) n0001.cluster Root – (initramfs) n0001.cluster AssetKey – – n0001.cluster IpmiIpaddr – – n0001.cluster IpmiNetmask – – n0001.cluster IpmiPort – – n0001.cluster IpmiGateway – – n0001.cluster IpmiUserName – – n0001.cluster IpmiInterface – – n0001.cluster default:DEVICE – – n0001.cluster default:HWADDR – – n0001.cluster default:IPADDR – – n0001.cluster default:IPADDR6 – – n0001.cluster default:NETMASK default 255.255.255.0 n0001.cluster default:GATEWAY default 10.0.1.0 n0001.cluster default:TYPE – – n0001.cluster default:ONBOOT – false n0001.cluster default:DEFAULT – false Any help would be appreciated ---
**Author:** ![sspencerwire](https://avatars.discourse-cdn.com/v4/letter/s/c2a13f/32.png) [@sspencerwire](https://forums.rockylinux.org/u/sspencerwire)\ **Post date:** [April 19, 2022, 3:37pm UTC](https://forums.rockylinux.org/t/need-help-in-configuring-dhcp-sever/5792/7 "2022-04-19T15:37:01Z")
This isn’t an answer to your entire problem here, but I have to ask related to this: “Where is the 192.168.200.1 address coming from?” Is there another DHCP server on the network? ---
**Author:** ![jlehtone](https://avatars.discourse-cdn.com/v4/letter/j/e9a140/32.png) [@jlehtone](https://forums.rockylinux.org/u/jlehtone)\ **Post date:** [April 19, 2022, 3:48pm UTC](https://forums.rockylinux.org/t/need-help-in-configuring-dhcp-sever/5792/8 "2022-04-19T15:48:50Z")
> [@jgalt](#): > > [root@localhost warewulf]# wwctl node status > [ERROR] : Could not connect to Warewulf server: Get “[http://192.168.200.1:9873/status”:](http://192.168.200.1:9873/status%E2%80%9D:) dial tcp 192.168.200.1:9873: i/o timeout > > Where is the 192.168.200.1 adddress coming from? It is the ‘wwctl node status’ command that attempts to use that address. Perhaps the ww config says: “a node will have address 192.168.200.1”? The command obviously fails, as no machine has such address. ---
**Author:** ![jgalt](https://avatars.discourse-cdn.com/v4/letter/j/439d5e/32.png) [@jgalt](https://forums.rockylinux.org/u/jgalt)\ **Post date:** [April 19, 2022, 4:00pm UTC](https://forums.rockylinux.org/t/need-help-in-configuring-dhcp-sever/5792/9 "2022-04-19T16:00:23Z")
The only other DHCP server would be the router between my ISP and head node mother board. 192.168.4.x ---
**Author:** ![jgalt](https://avatars.discourse-cdn.com/v4/letter/j/439d5e/32.png) [@jgalt](https://forums.rockylinux.org/u/jgalt)\ **Post date:** [April 19, 2022, 8:24pm UTC](https://forums.rockylinux.org/t/need-help-in-configuring-dhcp-sever/5792/10 "2022-04-19T20:24:12Z")
It’s not in the warewulf.conf file. ``` WW_INTERNAL: 43 ipaddr: 10.0.1.10 netmask: 255.255.255.0 network: 10.0.1.0 warewulf: port: 9873 secure: true update interval: 60 autobuild overlays: true host overlay: false syslog: false datastore: "" dhcp: enabled: true template: default range start: 10.0.1.20 range end: 10.0.1.99 template: default systemd name: dhcpd tftp: enabled: true tftproot: /var/lib/tftpboot systemd name: tftp nfs: enabled: true exports: - /home - /var/warewulf systemd name: nfs-server ``` ---
**Author:** ![mdelfava](https://sea2.discourse-cdn.com/flex020/user_avatar/forums.rockylinux.org/mdelfava/32/2467_2.png) [@mdelfava](https://forums.rockylinux.org/u/mdelfava)\ **Post date:** [April 19, 2022, 11:50pm UTC](https://forums.rockylinux.org/t/need-help-in-configuring-dhcp-sever/5792/11 "2022-04-19T23:50:54Z")
I’ve been running a dual NIC dhcp/dns server for years on my home network. I just recently updated it to Rocky 8.5. Here’s the crux of my dhpcd.conf file: ```auto # # /etc/dhcp/dhcpd.conf # # Turn on Dynamic DNS #ddns-domainname "litterbox.net"; #ddns-update-style interim; #ddns-updates on; # Don't allow clients to update DNS, make server do it # based on the hostname passed by the DHCP client: #DENY client-updates; #allow unknown-clients; default-lease-time 172800; max-lease-time 345600; subnet 192.168.221.0 netmask 255.255.255.0 { option routers 192.168.221.1; range 192.168.221.100 192.168.221.150; option broadcast-address 192.168.221.255; option domain-name-servers 192.168.221.11, 208.67.220.220; option domain-name "litterbox.net"; option ip-forwarding off; } subnet 192.168.168.0 netmask 255.255.255.0 { option routers 192.168.168.1; range 192.168.168.100 192.168.168.150; option broadcast-address 192.168.168.255; option domain-name-servers 192.168.168.11, 208.67.220.220; option domain-name "litterscooped.net"; option ip-forwarding off; } # Host reservations # #host { #hardware ethernet ; #fixed-address 192.168.x.x; #} <.....> ``` Hope this is of help to you… ---
**Author:** ![jgalt](https://avatars.discourse-cdn.com/v4/letter/j/439d5e/32.png) [@jgalt](https://forums.rockylinux.org/u/jgalt)\ **Post date:** [April 20, 2022, 12:16am UTC](https://forums.rockylinux.org/t/need-help-in-configuring-dhcp-sever/5792/12 "2022-04-20T00:16:52Z")
Thanks for the information. I reconfigured my dhcp early and it is working. It is similar to yours. The nodes receive ipaddress on both NICs. Progress!!” So I think it is working. Now I’m researching TFTP / PXE error codes. As you can tell, I’m not a network guy. It has been a steep learning curve. Thanks again. ---
**Author:** ![mdelfava](https://sea2.discourse-cdn.com/flex020/user_avatar/forums.rockylinux.org/mdelfava/32/2467_2.png) [@mdelfava](https://forums.rockylinux.org/u/mdelfava)\ **Post date:** [April 20, 2022, 2:07am UTC](https://forums.rockylinux.org/t/need-help-in-configuring-dhcp-sever/5792/13 "2022-04-20T02:07:34Z")
Jgalt, congratulations! You’re learning… ---
**Author:** ![brian](https://sea2.discourse-cdn.com/flex020/user_avatar/forums.rockylinux.org/brian/32/5777_2.png) [@brian](https://forums.rockylinux.org/u/brian)\ **Post date:** [August 25, 2023, 3:51am UTC](https://forums.rockylinux.org/t/need-help-in-configuring-dhcp-sever/5792/14 "2023-08-25T03:51:22Z")