We already configure our QEMU in GNS3 and run our vSRX Router. Now its time to configure DHCP server in our vSRX router. Lets began.
Logical Diagram for this tutorial



To configure DHCP server

Assign Lowest and highest IP range
root# set system services dhcp pool 192.168.1.0/24 address-range low 192.168.1.50 high 192.168.1.200

Assign DNS server (in my case I had used Router interface IP)
root# set system services dhcp pool 192.168.1.0/24 name-server 192.168.1.1

Assign IP address of the router
root# set system services dhcp pool 192.168.1.0/24 router 192.168.1.1

Assign the lease time
root# set system services dhcp pool 192.168.1.0/24 default-lease-time 3600



Assign DHCP as an allowed inbound service for the interface which we are going to enable DHCP.

root# set security zones security-zone untrust interfaces ge-0/0/1 host-inbound-traffic system-services dhcp

Assign IP address to the client faced interface.
root# set interfaces ge-0/0/1 unit 0 family inet address 192.168.1.1/24



Check our client get the IP Address from the server.

In this tutorial I'm going to run vSRX JunOS in QEMU and configure it as DHCP Server. Lets began with installing vSRX into QEMU.

I have try vSRX to run into Vbox but never succeeded. So I better to choose QEMU otherwise waste of time.

In my case I had used junos-vsrx-12.1X46-D10.2-domestic to mount into QEMU. Search for it.
Now we have to convert our .vdi file into .image, for that use following command

cd d:\junos\
c:\Program Files\GNS3\qemu\>qemu-img.exe convert -O qcow2 d:\junos\junos-vsrx-12.1X46-D10.2-domestic-disk1.vdi d:\junos\junos-vsrx-12.1X46-D10.2-domestic.img

We just made our image ready to run into QEMU. Go the GNS3

Note: Strongly recommended to use QEMU in linux and enable KVM otherwise it eats up all your CPU and RAM.

-nographic -smp 2 -enable-kvm

>edit>preference>choose "QEMU VMs"
Click on "New" Choose "Default " Gave Name "vSRX" (in my case).

While doing some lab test, this weird syslogd message appear every seconds on the console terminal, so it was very difficult to complete the lab.