Re: why i don't receive DHCPDiscover message from server using dongle and why same code give DHCPNac on wifi

Things, I would try first:

example.com? - is the returned IP the correct one? Set manually to see if that helps?
Check if router filters on MAC... (update:) If the router does not forward IP packets from an unregistered source (the MAC of your PCs card/dongle), the request will not reach the server - this is a simple (but not very effective) security measure.
Check if local hosts interface(s) is reachable from server (routing). (update:) If the server is multi-homed and the routing is not configured right, the response might travel through the wrong (default-)network.
Snoop at server side, analyse traffic with wireshark. (updated)
Use i.e. perltidy to make code easier to parse for humans ;-)

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Re^2: why i don't receive DHCPDiscover message from server using dongle and why same code give DHCPNac on wifi by ppp (Acolyte) on Jan 11, 2015 at 18:35 UTC
Example.com is extra part (just to print current IP at terminal , I removed it now). The real part of socket creation is done in SocketCreation() function. Please explain points 2 , 3 and 4 (specially 2, 3) in bit more details. Also please note that i am using windows (not linux) Thanks a lot.	[reply]
Re^3: why i don't receive DHCPDiscover message from server using dongle and why same code give DHCPNac on wifi by LanX (Saint) on Jan 11, 2015 at 19:21 UTC
Please note that this is a Perl board, not a sys admin help desk. Cheers Rolf PS: Je suis Charlie!	[reply]