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DHCP Discovery
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DHCP Discovery Tool Description - Last Review: October 29, 2011

The NetScanTools Pro DHCP Discovery tool finds IPv4 Dynamic Host Configuration Protocol (DHCP) servers on your local network segment or subnet. It detects all responding DHCP servers whether legitimate or servers that are not supposed to be on your network (sometimes called rogue DHCP servers).

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Version 11 DHCP Discovery Tool Slideshow

Important Notes:

  • This tool discovers segments on your local network segment only.

  • It is currently IPv4 only.

Purpose of this tool:

  • The purpose of this tool is to help you find IPV4 DHCP Servers on your network and see the information they are offering in response to a DHCP_DISCOVER query.

Tool Capabilities

The fields decoded and displayed from a server DHCP_OFFER response packet are shown in this table:

DHCP Server IP Address DHCP Server Hostname Offered IP Address
Offered Subnet Mask IP Address Lease Time Renewal Time
Rebinding Time Domain Name DNS IP Address
Router IP Address NTP Server IP Address  

The option requests shown in bold can be turned on or off. You can control the MAC address sent in the DHCP_DISCOVER broadcast packet to DHCP servers.

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