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| | + | [[Category:Linux]] |
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| | Dynamic Host Configuration Protocol. | | Dynamic Host Configuration Protocol. |
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| | However, '''the DHCP server's IP @ must always be static!!''' | | However, '''the DHCP server's IP @ must always be static!!''' |
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| | + | |
| | + | If you want to use a DNS, then you can even setup the DNS server first. See [[DNS server]] |
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| − | =Configuration= | + | =Security= |
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| | + | See [[Firewall INPUT filters#DHCP|Firewall rules for DHCP server]] |
| | | | |
| − | The main configuration file is '''/etc/dhcp/dhcpd.conf'''
| |
| | | | |
| − | <syntaxhighlight lang="bash">
| |
| − | vim /etc/dhcp/dhcpd.conf
| |
| − | </syntaxhighlight>
| |
| | | | |
| | | | |
| − | You can adjust the interface the server is listening on in /etc/dhcp/dhcp3-server
| + | =Configuration= |
| − | INTERFACES="eth0 eth1"
| |
| | | | |
| | | | |
| − | ==Random IP assignation== | + | ==Configuration file== |
| | | | |
| − | The following configuration will accept all clients and give them a random IP @. | + | The main configuration file is '''/etc/dhcp/dhcpd.conf''' |
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| | <syntaxhighlight lang="bash"> | | <syntaxhighlight lang="bash"> |
| − | # Sample /etc/dhcpd.conf
| + | vim /etc/dhcp/dhcpd.conf |
| − | # (add your comments here)
| |
| − | default-lease-time 600;
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| − | max-lease-time 7200;
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| − | option subnet-mask 255.255.255.0;
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| − | option broadcast-address 192.168.100.255;
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| − | option routers 192.168.100.254;
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| − | option domain-name-servers 192.168.100.1, 192.168.100.2;
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| − | option domain-name "mydomain.lan";
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| − | option ntp-servers 192.168.100.254;
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| − | | |
| − | subnet 192.168.100.0 netmask 255.255.255.0 {
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| − | range 192.168.100.10 192.168.100.100;
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| − | range 192.168.100.150 192.168.100.200;
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| − | }
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| | </syntaxhighlight> | | </syntaxhighlight> |
| | | | |
| − | You have to adjust:
| |
| − | * Network parameters - instead of 192.168.100.*
| |
| − | * DHCP range(s). In the given example there are 2 ranges from 10-100 and 150-200
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| | | | |
| | + | You can adjust the interface the server is listening on in /etc/dhcp/dhcp3-server |
| | + | INTERFACES="eth0 eth1" |
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| | | | |
| − | ==Static IP @== | + | ==Assign IP== |
| − | | |
| − | This new configuration will ONLY accept known clients and give them a static IP @.
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| − | | |
| − | <syntaxhighlight lang="bash">
| |
| − | # Sample /etc/dhcpd.conf
| |
| − | # (add your comments here)
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| − | default-lease-time 600;
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| − | max-lease-time 7200;
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| − | option subnet-mask 255.255.255.0;
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| − | option broadcast-address 192.168.100.255;
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| − | option routers 192.168.100.254;
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| − | option domain-name-servers 192.168.100.1, 192.168.100.2;
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| − | option domain-name "mydomain.lan";
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| − | option ntp-servers 192.168.100.254;
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| − | | |
| − | deny unknown-clients;
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| − | | |
| − | subnet 192.168.100.0 netmask 255.255.255.0 {
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| − | host client1 {
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| − | hardware ethernet DD:GH:DF:E5:F7:D7;
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| − | fixed-address 192.168.100.20;
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| − | }
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| − | host client2 {
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| − | hardware ethernet 00:JJ:YU:38:AC:45;
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| − | fixed-address 192.168.100.21;
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| − | }
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| − | }
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| − | | |
| − | </syntaxhighlight>
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| − | | |
| − | Note:
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| − | | |
| − | The ''deny unknown-clients;'' command is why only known clients are accepted.
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| − | | |
| − | | |
| − | For each client you have to adjust:
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| − | * MAC @
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| − | * Set a specific static IP @
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| − | | |
| − | | |
| − | ==Advanced configuration (name + netboot)==
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| − | | |
| − | In the following scenario you will configure the server to accept only specific clients, use static IP @ and set names.
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| − | | |
| − | This configuration also allow NetBoot using PXE technology.
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| − | | |
| | | | |
| | + | You can assign dynamic and / or static IP, you can also you NetBoot settings. |
| | | | |
| − | <syntaxhighlight lang="bash">
| + | See: |
| − | #### General options ####
| + | * [[DHCP dynamic IP assignation]] |
| − | | + | * [[DHCP static IP assignation]] |
| − | ## Domain settings
| + | * [[DHCP netboot configuration]] |
| − | # domain name
| |
| − | option domain-name "myDomain.lan";
| |
| − | # DNS IP @ (replace it by your IP server, Google DNS or your ISP DNS)
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| − | option domain-name-servers XXX.XXX.XXX.XXX, YYY.YYY.YYY.YYY;
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| − | # DNS update system (disable)
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| − | ddns-update-style none;
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| − | | |
| − | ## IP lease settings
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| − | default-lease-time 7200;
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| − | max-lease-time 86400;
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| − | | |
| − | ## Network settings
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| − | # DHCP server name
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| − | server-name "dns.myDomain.lan";
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| − | # Authoritative server = this is the official DHCP server for the local network
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| − | authoritative;
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| − | # Subnet-mask
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| − | option subnet-mask 255.255.255.0;
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| − | | |
| − | | |
| − | ## Security
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| − | # Do not allow unknown clients
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| − | deny unknown-clients;
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| − | # Do not forward DHCP request from this server to another one using a different Network Interface
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| − | option ip-forwarding off;
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| − | | |
| − | # Use this to send dhcp log messages to a different log file
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| − | # you also have to hack syslog.conf to complete the redirection
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| − | log-facility local7;
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| − | | |
| − | ### NetBoot PXE
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| − | # Enable network boot using TFTP
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| − | allow bootp;
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| − | allow booting;
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| − | | |
| − | | |
| − | ## Available networks
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| − | | |
| − | # Your server can manage many network. Just add new subnet{} instruction
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| − | | |
| − | # Main LAN
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| − | subnet 192.168.100.0 netmask 255.255.255.0 {
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| − | #### Overall settings
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| − | # You can override the default domain set earlier
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| − | option domain-name "myDomain.lan";
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| − | # Broadcast address
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| − | option broadcast-address 192.168.100.255;
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| − | # Default gateway
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| − | option routers 192.168.100.1;
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| − | # Set the NTP (time server) to use
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| − | option ntp-servers 192.168.100.1;
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| − | | |
| − | | |
| − | #### DHCP range
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| − | # Hint: if the range has only 1 address, and this is a bail (fixed address), then the range won't be used!
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| − | range 192.168.100.5 192.168.100.5;
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| − | | |
| − | #### NETBOOT settings
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| − | # PXE file to serve.
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| − | # >> elilo.efi => for ia64 clients;
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| − | # >> pxelinux.0 => for x86
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| − | # These files should be at the root of your TFTP server
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| − | # Note: The file name can be add in the "host" section too. Then, the "host" will override the current setting
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| − | filename "pxelinux.0";
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| − | # set the server that serve this NETBOOT file
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| − | next-server 192.168.100.2;
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| − | # Ensure that the new client (the one boot) is not stealing someone else IP @
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| − | ping-check = 1;
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| − | }
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| − | | |
| − | #### Managed host and fixed IP @
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| − | # FTP server
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| − | host ftp {
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| − | hardware ethernet 00:0f:75:af:eb:44;
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| − | fixed-address 192.168.100.2;
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| − | | |
| − | ### NetBoot PXE settings
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| − | # dedicated file for the current machine:
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| − | #filename "debian-installer/ia64/elilo.efi";
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| − | # Set the TFTP server
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| − | #next-server 192.168.100.2;
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| − | }
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| − | # WEB server
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| − | host web {
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| − | hardware ethernet 00:02:0d:31:d1:cc;
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| − | fixed-address 192.168.100.3;
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| − | }
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| − | # EMAIL server
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| − | host mail {
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| − | hardware ethernet 00:02:55:d2:d1:cc;
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| − | fixed-address 192.168.100.4;
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| − | }
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| − | # LAPTOP workstation
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| − | host laptop {
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| − | hardware ethernet 00:0e:af:31:d1:cc;
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| − | fixed-address 192.168.100.5;
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| − | }
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| − | </syntaxhighlight>
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| − | | |
| − | ==Logs==
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| − | | |
| − | Logs are in '''/var/log/syslog'''
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| − | | |
| − | | |
| − | | |
| − | ==Leases==
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| − | | |
| − | All DHCP leases are available in:
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| − | | |
| − | <syntaxhighlight lang="bash">
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| − | vim /var/lib/dhcp3/dhcpd.leases
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| − | </syntaxhighlight>
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| − | | |
| − | | |
| − | | |
| − | ==Manage service==
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| − | | |
| − | | |
| − | You can start / restart service using:
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| − | | |
| − | <syntaxhighlight lang="bash">
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| − | service isc-dhcp-server start|restart|stop
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| − | </syntaxhighlight>
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| − | | |
| − | OR
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| − | | |
| − | <syntaxhighlight lang="bash">
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| − | /etc/init.d/isc-dhcp-server restart
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| − | </syntaxhighlight>
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| − | | |
| − | | |
| − | You can check the status using:
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| − | <syntaxhighlight lang="bash">
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| − | ps aux | grep dhcp
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| − | netstat -uap | grep dhcp
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| − | </syntaxhighlight>
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| − | | |
| − | =NetBoot using PXE and TFTP=
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| − | | |
| − | | |
| − | ==Installation==
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| − | | |
| − | '''Trivial FTP (TFTP) server'''
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| − | <syntaxhighlight lang="bash">
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| − | apt-get install tftpd-hpa
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| − | </syntaxhighlight>
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| − | | |
| − | '''SysLinux [netboot utilities]'''
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| − | <syntaxhighlight lang="bash">
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| − | apt-get install syslinux mtools initramfs-tools
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| − | </syntaxhighlight>
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| − | | |
| − | '''NFS support'''
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| − | <syntaxhighlight lang="bash">
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| − | apt-get install nfs-kernel-server nfs-common
| |
| − | </syntaxhighlight>
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| − | | |
| − | '''Debootstrap (manage netboot image)'''
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| − | <syntaxhighlight lang="bash">
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| − | apt-get install debootstrap
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| − | </syntaxhighlight>
| |
Dynamic Host Configuration Protocol.
Note:
Since Ubuntu 11.10 the DHCP3-server is available in the "isc-dhcp-server" package.
Sources
You can find more information about that topic over here:
Requirement
A DHCP server can provided static or dynamic address.
However, the DHCP server's IP @ must always be static!!
If you want to use a DNS, then you can even setup the DNS server first. See DNS server
Installation
DHCP server
apt-get install isc-dhcp-server
You will be asked a few questions:
- On what network interfaces should the DHCP server listen? <-- eth0
- Please configure the DHCP server as soon as the installation finishes. <-- Ok
- The version 3 DHCP server is now non-authoritative by default <-- Ok
At the end of the installation you will see errors like these:
* Generating /etc/default/dhcp3-server...
- Starting DHCP server: dhcpd3 failed to start - check syslog for diagnostics.
- invoke-rc.d: initscript dhcp3-server, action "start" failed.
That's OK because we did not have the chance yet to configure our DHCP server.
Security
See Firewall rules for DHCP server
Configuration
Configuration file
The main configuration file is /etc/dhcp/dhcpd.conf
You can adjust the interface the server is listening on in /etc/dhcp/dhcp3-server
INTERFACES="eth0 eth1"
Assign IP
You can assign dynamic and / or static IP, you can also you NetBoot settings.
See:
