How to Install and Configure Multihomed ISC DHCP Server on Debian Linux

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Rob Turner

Rob Turner is an avid Debian user as well as many of the derivatives of Debian such as Devuan, Mint, Ubuntu, and Kali. Rob holds a Masters in Information and Communication Sciences as well as several industry certifications from Cisco, EC-Council, ISC2, Linux Foundation, and LPI.

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4 Responses

  1. Mohammed Hafeezuddin Jeelani says:

    Hello Guys,

    I do remember my first dhcp server I ever set up was a Linux machine 12 years ago. Every time people say windows dhcp server for vlans and I smiled.

    Any way keep in mind, Linux kernel which have support for 802.q will able to serve dhcp service also.

    For example here:

    # yum install dhcpd      (for fedora or rhel /cent)
    # dnf install dhcpd      (for fedora 22+)
    # apt-get install dhcpd  (for Ubuntu or Debian)
    

    Create virtual interfaces, you do no need more physical interfaces, in example to make 3 vlan 10.10.10.x, 10.10.20.x, and 10.10.30.x

    # nmcli con modify type vlan ifname vlan10 dev ens33 id 10 ip4 10.10.10.1/24 gw4 10.10.10.254
    # nmcli con add type vlan ifname vlan10 dev ens33 id 10 ip4 10.10.10.1/24 gw4 10.10.10.254
    # nmcli con add type vlan ifname vlan20 dev ens33 id 20 ip4 10.10.20.1/24 gw4 10.10.20.254
    # nmcli con add type vlan ifname vlan30 dev ens33 id 30 ip4 10.10.30.1/24 gw4 10.10.30.254
    

    This for fedora or rhel latest versions.

    For Ubuntu and Debian, command is:

    # vconfig add ens33 10
    # vconfig add ens33 20
    

    Then, configure the network settings for the VLAN interfaces:

    # ip addr add 10.10.10.1/24 dev ens33.10
    

    Bring up the VLAN interface:

    # ip link set eth33.10 up 
    

    Do for all interfaces in Ubuntu and then check ip address and see virutal interfaces pinging..

    Nex, open dhcpd.conf file and edit as follows.

    # option definitions common to all supported networks...
    option domain-name "example.org";
    option domain-name-servers ns1.example.org, ns2.example.org;
    
    default-lease-time 600;
    max-lease-time 7200;
    
    # Use this to enble / disable dynamic dns updates globally.
    #ddns-update-style none;
    
    # If this DHCP server is the official DHCP server for the local
    # network, the authoritative directive should be uncommented.
    #authoritative;
    
    # Use this to send dhcp log messages to a different log file (you also
    # have to hack syslog.conf to complete the redirection).
    log-facility local7;
    
    # No service will be given on this subnet, but declaring it helps the 
    # DHCP server to understand the network topology.
    
    subnet 10.10.0.0 netmask 255.255.0.0 {
    }
    
    # This is a very basic subnet declaration.
    
    subnet 10.10.10.0 netmask 255.255.255.0 {
      range 10.10.10.1 10.10.10.20;
      option routers 10.10.10.1;
    }
    subnet 10.10.20.0 netmask 255.255.255.0 {
      range 10.10.20.1 10.10.20.20;
      option routers 10.10.20.1;
    }
      subnet 10.10.30.0 netmask 255.255.255.0 {
      range 10.10.30.1 10.10.30.20;
      option routers 10.10.30.1;
    }
    

    save the file and start the service and your good to go.

    Connect to trunk port of switch and check it. Any doubts, do let me know.

    my email :[email protected]

  2. add says:

    its not control protokoll ist configuration protokoll

  3. D'jems Markenzy Mortimer says:

    How many NICs are attached to this server exactly? I’m not too keen on the NIC bonding in Linux yet. Can you elucidate?

    • Rob Turner says:

      D’jems,

      This particular server only has one NIC. On the network that it was used in, the Cisco router was setup with an ip helper address for other vlans.

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