Configuring IPv4 DHCP Juniper SRX

After configuring a Dual Stacked DHCP server and DHCPv6 on Juniper SRX, it’s only right that I did something on Configuring DCHPv4 on a Juniper SRX.

This wont be a long or detailed post, as the configuration is very much the same as my previous post on how to configure DHCPv6 on a SRX, and I’ve went thought quite a lot before about how DHCP works etc.

First, under the system services dhcp-local-server stanza, you will need to create group and set a physical or logical interface that will have DHCP enabled

[email protected]# show system services dhcp-local-server    
group dhcpv4-group {
    interface vlan.3407;
}

Next, under the access address-assignment stanza, you will need to set the network, the DHCP range and set the IP address that the router will be using within the DCHP pool. The propagate-settings will take configuration from the client DHCP on vlan.3407, if not otherwise specified, most importantly name-server which changes from ISP to ISP and is very important otherwise name resolutions on the LAN won’t work.

[email protected]# show access   
address-assignment {
    pool v4 {
        family inet {
            network 172.31.106.16/29;
            range v4-range {
                low 172.31.106.18;
                high 172.31.106.22;
            }
            dhcp-attributes {
                router {
                    172.31.106.17;
                }
                propagate-settings vlan.3407;
            }
        }
    }
}

This will be all configuration needed to have DHCPv4 on Juniper SRX220. For troubleshooting DHCP you will be able to use the commands below:

[email protected]> show dhcp ? 
Possible completions:
  client               Show DHCP client information
  relay                Show DHCP relay information
  server               Show DHCP server information
  snooping             Show DHCP snooping information
  statistics           Show DHCP service statistics

As I said, this is the quick post :p

I have included the set commands used in my example below:

set system services dhcp-local-server group dhcpv4-group interface vlan.3407
set access address-assignment pool v4 family inet network 172.31.106.16/29
set access address-assignment pool v4 family inet range v4-range low 172.31.106.18
set access address-assignment pool v4 family inet range v4-range high 172.31.106.22
set access address-assignment pool v4 family inet dhcp-attributes router 172.31.106.17
set access address-assignment pool v4 family inet dhcp-attributes propagate-settings vlan.3407

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Keeran Marquis

Network Engineer

Keeran Marquis is a Network Engineer. His main goal is to learn everything within the Networking field, pick up a little bit of scripting, be a poor man sysadmin and share whatever he knows! All Posts are his own views, opinions and experiences, no guarantees they will work for you but point you in the right direction 🙂

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