how to discover dhcp ?

wakatana · 10-07-2009, 01:25 AM

Hi is possible to discover DHCP on network ? I typed:

Code:

telnet dhcp_ip_address 86

but returns me "telnet: Unable to connect to remote host: Connection refused". I am sure that DHCP is running properly, what is problem ?
PS: Is possible to investigate if my PC has IP from DHCP or staticaly set ? Thanks a lot

pielas · 10-07-2009, 07:02 AM

you can discover dhcp by command dhcpcd

wakatana · 10-08-2009, 04:52 PM

i dont know dhcpd, but what I read that is DHCP daemon, how discover this DHCP ? I tryied that:

Code:

sudo dhclient eth0
Internet Systems Consortium DHCP Client V3.1.1
Copyright 2004-2008 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/

Listening on LPF/eth0/00:0a:e4:b6:fa:92
Sending on   LPF/eth0/00:0a:e4:b6:fa:92
Sending on   Socket/fallback
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 8
DHCPOFFER of 147.232.182.17 from 147.232.182.1
DHCPREQUEST of 147.232.182.17 on eth0 to 255.255.255.255 port 67
DHCPACK of 147.232.182.17 from 147.232.182.1
bound to 147.232.182.17 -- renewal in 405 seconds.

and then

Code:

nc -u 147.232.182.1 68 and nc -u 147.232.182.1 67

but did not working...

-u switch because DHCP is UDP (probably problem against previous telnet 147.232.182.1 67)