[Winpcap-users] send packet to the network problem.

[eddie harari]

no I have not , but i think i solved the problem. ( not completly but i understand when it happens).
( thogh it is 04:38 here and i kind of seing 01010010101 only).

but here is what i think:

 when i send a packet to the network with my  own MAC & IP , it works great.
 when i send a packet to the network with fake MAC & fake IP other computers on the network 
 dont see this packet .
 
 when i send a packet to the network with my own MAC but FAKE IP , it works also and other computers see this packet on the network and the computer which needs to get this packet does get it !


 so basically what i am saying is that other computers do not get packets that comes from fake MAC , 
 even if it is one of the MAC addresses that exsists on the net.

  I do not remember what an OS should do when it get a packet to it's IP when it comes from MAC it does not have in it's arp table. ( I assumed it should not care ) however i see that every time i spoof a mac the packet does not get to it's destination.

thanks , 
Eddie.


 i am working with a simple linksys AP , no security features, no wep or other encryption.

does anyone know if this is somekind of defense method ? should a computer compare each packets src mac ? 
is the AP checking for MAC spoofing by default ? 

 
----- Original Message ----
From: Gianluca Varenni <gianluca.varenni at cacetech.com>
To: winpcap-users at winpcap.org
Sent: Tuesday, January 30, 2007 3:28:33 AM
Subject: Re: [Winpcap-users] send packet to the network problem.


Have you tried running the same tx application on a wired ethernet adapter and see if the other end receives it?
 
Have a nice day
GV
----- Original Message ----- 
From: eddie harari 
To: winpcap-users at winpcap.org 
Sent: Monday, January 29, 2007 3:23 PM
Subject: [Winpcap-users] send packet to the network problem.


Hi all , 
  I have winpcap installed on cygwin ( win XP sp II platform ) .
  everything works fine , and i can even monitor my wireless network ( with my HP laptop built in WIFI  connection ).
 
  My problem is as follows:
 
 1. I am not sure that i am able to send packets on this card using winpcap.
 
   I am able to make a packet buffer which is a correct sequance of bytes containing the Ethernet 14 byte header , the IP header and the ICMP header and data ( echo request ).
 
 however, when i run a sniffer  on the destination to see if it gets my packet, i see nothing. ( I dont get the packet on the destination.
 
 when i sniff the network on the host that sends the packet ( my laptop ) , I see the packet and I see that the packet is correct ( headers ,checksums etc...).
 
  I am not sure if i should be able to do that on a wi-fi connection or not ?
 
  Is there a way to insert such packet to the wi-fi network using winpcap ? 
  I was able to do that using RAW Socket interface , but i much prefer the win pcap interface...
 
 thanks , 
 
 Eddie.
 



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