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Leaked source code of windows server 2003
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windows-server-2003/net/dhcp/client/rogue/dhcploc.txt

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  2. dhcploc:
  4. This utility can be used to detect unauthorized DHCP server on a subnet.
  5. It displays the dhcp servers that are active on the subnet and beeps and
  6. sends out alert messages when it sees from any unauthorized dhcp
  7. servers. The usage of this tool is as given below :
  9. dhcploc [-p] [-a:"list-of-alertnames"] [-i:alertinterval] machine-ip-address [list of valid dhcp servers ip addresses]
  11. machine-ip-address - ip address of the machine where the utility is
  12. run. If the machine has multiple adapters then you need to select an
  13. adapter (and the corresponding ip address) that is connected to the
  14. subnet under test.
  16. list of valid dhcp servers - you can specify any number of authorized
  17. dhcp servers' ip addresses here. This utility will be silent if it sees any
  18. packets from these server. However it will display the packets it sees
  19. from these servers unless '-p' option is specified.
  21. -p - if this option is specified then this utility will not display the
  22. packets it sees from the specified authorized dhcp servers.
  24. -a - if this option is specified the tool sends of alert message to
  25. the list of names specified.
  27. -i - this option specifies the alert frequency in seconds.
  29. The format of the output will look like as below :
  31. <time> (IP)<ipaddress offered> <packet type> (S)<server ip address> <***>
  33. *** - indicates unauthorized server.
  35. Examples :
  37. 17:34:58 (IP)0.0.0.0 NACK (S)11.11.31.84 ***
  38. 17:36:38 (IP)11.101.190.130 OFFER (S)11.101.12.226 ***
  39. 17:36:38 (IP)11.101.196.231 ACK (S)11.101.13.53
  40. 17:36:53 (IP)11.101.196.231 ACK (S)11.101.13.53
  41. 17:37:05 (IP)11.101.196.234 OFFER (S)11.101.13.53
  42. 17:37:05 (IP)11.101.193.232 OFFER (S)11.101.12.198
  43. 17:37:06 (IP)11.101.190.132 OFFER (S)11.101.12.226 ***