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Wed, Aug 10, 2016 10:38 pm

DHCP Reserved Address from NetScreen Firewall

A Juniper Networks NetScreen firewall/router can be configured to function as a DHCP server; for the method to do so from a command line interface (CLI), which you can obtain by a Secure Shell (SSH) connection to the device, see Using a Juniper Networks NetScreen Firewall as a DHCP Server. The system can assign addresses dynamically from a pool of addresses you select or you can have it assign a reserved, i.e., fixed, address based on the media access control (MAC) address of the system requesting a DHCP-assigned IP address.

You can determine what addresses have already been assigned to systems via DHCP using a command in the form get interface <interface> dhcp server ip allocate where interface is a particular interface, e.g., trust, untrust, etc.

ns5xp-> get interface trust dhcp server ip allocate
       IP         	State	     MAC     	Lease Time
 192.168.0.34   	COMMIT	*000d560e185e	3236 minutes
 192.168.0.35   	COMMIT	*4c72b99cb82a	3925 minutes
ns5xp->

If I wished to assign the IP address 192.168.0.7 to the system above with MAC address 4c72b99cb82a, I could use the command below:

set interface trust dhcp server ip 192.168.0.7 mac 4c72b99cb82a

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