Release and update of the IP address on a PC

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If a user wants to update its IP address, release the old IP address on the PC (DHCP client). The IP address does not need to be released when the lease is updated.
1. (Optional) Release an IP address.
The commands for releasing an IP address vary with the operating system.
a. Run the ipconfig/release command on a PC running Windows 7 to release the IP address.
b. Run the winipcfg/release command in the Windows 98 MS-DOS environment to release the IP address.
2. Update an IP address.
The commands for updating the lease of an IP address vary with the operating system.
a. Run the ipconfig/renew command on a PC running Windows 7 to update the IP address lease or request a new IP address.
b. Run the winipcfg/renew command in the Windows 98 MS-DOS environment to update the IP address lease or request a new IP address.

Other related questions:
How is the PC's IP address released and updated on an AR
If a user wants to update its IP address, release the old IP address on the PC (DHCP client). The IP address does not need to be released when the lease is updated. 1. (Optional) Release an IP address. The commands used to release an IP address in different OSs are different: a. Run the ipconfig/release command in the Windows 7 environment of the user PC to release an IP address. b. Run the winipcfg/release command in the Windows 98 MS-DOS environment to release an IP address. 2. (Optional) Update an IP address. The commands used to update an IP address in different OSs are different: a. Run the ipconfig/renew command in the Windows 7 environment of the user PC to update the IP address lease or request a new IP address. b. Run the winipcfg/renew command in the Windows 98 MS-DOS environment to update the IP address lease or request a new IP address.

IP address release and update on S series switch
If you need to allocate new IP addresses to PCs (DHCP clients), you must release old IP addresses from the PCs. However, you can renew IP address leases without releasing IP addresses. 1. (Optional) Releasing an IP address The command for releasing an IP address varies according to the operating system: a. If the PC runs the Windows 7 operating system, run the ipconfig or release command. b. If the PC runs the Windows 98 MS-DOS operating system, run the winipcfg or release command. 2. Requesting a new IP address or renewing IP address lease The command for requesting an IP address or renewing IP address lease also varies according to the operating system: a. If the PC runs the Windows 7 operating system, run the ipconfig or renew command. b. If the PC runs the Windows 98 MS-DOS operating system, run the winipcfg or renew command.

Method used to configure the USG firewall to release an IP address allocated by DHCP to the PC
On the USG2000, USG5000, and USG6000, you can release the IP address allocated by DHCP to the PC using the following commands: Clear address 10.110.1.1 reset dhcp server ip-in-use ip 10.110.1.1 The commands can clear both expired and valid address binding information.

Display IP addresses of clients connected to S series switch
When an S series switch, except S1700, works at Layer 2, only the MAC address of the interface is displayed, but IP address is not displayed. When an S series switch, except S1700, works at Layer 3 and you have known the MAC address of a connected client, you can run the display arp all command to check the IP address of the client. If you do not know the MAC address of the client, run the ipconfig/all command on your PC. For example: display arp all IP ADDRESSMAC ADDRESSEXPIRE(M) TYPEINTERFACEVPN-INSTANCE VLAN/CEVLAN 10.137.217.202 00e0-0987-7890 I - Eth0/0/0 10.137.216.1 0000-5e00-0149 20 D-0 Eth0/0/0 Total:2 Dynamic:1 Static:0 Interface:1 (1) The IP address of the PC with MAC address 00e0-0987-7890 is 10.137.217.202. (2) The total number of dynamic and static ARP entries is the number of access users.

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