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<DIV><SPAN class=717052911-19082004><FONT face=Tahoma size=2>Hello,
all</FONT></SPAN></DIV>
<DIV><SPAN class=717052911-19082004></SPAN><SPAN class=717052911-19082004><FONT
face=Tahoma size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=717052911-19082004><FONT face=Tahoma size=2>I tried some
interesting experiment today.</FONT></SPAN></DIV>
<DIV><SPAN class=717052911-19082004><FONT face=Tahoma
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=717052911-19082004><FONT face=Tahoma size=2>First, I made an
udp client on Linux machine (w/ hostap) which sends meaningless 1200 bytes-long
packet three times to my laptop.</FONT></SPAN></DIV>
<DIV><SPAN class=717052911-19082004><FONT face=Tahoma size=2>I could definitely
see these packets delievered to the laptop by sniffing the medium (I use
AiroPeek).</FONT></SPAN></DIV>
<DIV><SPAN class=717052911-19082004><FONT face=Tahoma
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=717052911-19082004><FONT face=Tahoma size=2>Second, I modified
hostap_data_start_xmit of hostap_80211_tx.c.</FONT></SPAN></DIV>
<DIV><SPAN class=717052911-19082004><FONT face=Tahoma size=2>I changed addr1
field (destination address) to another address which doesn't exist on the
network </FONT></SPAN><SPAN class=717052911-19082004><FONT face=Tahoma size=2>if
the packet was generated by my udp client program, </FONT></SPAN><SPAN
class=717052911-19082004><FONT face=Tahoma size=2>(I compared the udp port
number.) a</FONT></SPAN><SPAN class=717052911-19082004><FONT face=Tahoma
size=2>nd then called dev_queue_xmit.</FONT></SPAN></DIV>
<DIV><SPAN class=717052911-19082004><FONT face=Tahoma size=2>However, I
counldn't find out those packets !!!</FONT></SPAN></DIV>
<DIV><SPAN class=717052911-19082004></SPAN><SPAN class=717052911-19082004><FONT
face=Tahoma size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=717052911-19082004><FONT face=Tahoma size=2>I assumed that the
address was checked by the kernel and NIC would merely send this
packet.</FONT></SPAN></DIV>
<DIV><SPAN class=717052911-19082004><FONT face=Tahoma
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=717052911-19082004><FONT face=Tahoma size=2>What would prevent
this packet from being delivevered?</FONT></SPAN></DIV>
<DIV><SPAN class=717052911-19082004><FONT face=Tahoma size=2>Does NIC have its
own association table or something?</FONT></SPAN></DIV>
<DIV><FONT face=Tahoma size=2></FONT> </DIV>
<DIV><SPAN class=717052911-19082004><FONT face=Tahoma
size=2>Regards,</FONT></SPAN></DIV>
<DIV><SPAN class=717052911-19082004><FONT size=2></FONT></SPAN> </DIV>
<DIV align=left><FONT face="Comic Sans MS"
size=2>==========================</FONT></DIV>
<DIV align=left><FONT size=3><FONT face="Comic Sans MS"><FONT
size=2></FONT></FONT></FONT> </DIV>
<DIV align=left><FONT face="Comic Sans MS" size=2><STRONG>Woo,
Donghyuk</STRONG></FONT></DIV>
<DIV align=left><FONT size=3><FONT face="Comic Sans MS"><FONT
size=2></FONT></FONT></FONT> </DIV>
<DIV align=left><FONT face="Comic Sans MS" color=#0000a0 size=2><A
href="http://www.shine21.pe.kr/"><STRONG>http://www.shine21.pe.kr</STRONG></A></FONT></DIV>
<DIV align=left><FONT face="Comic Sans MS" color=#0000a0 size=2><A
href="mailto:shine21@korea.com"><STRONG>shine21@korea.com</STRONG></A></FONT></DIV>
<DIV align=left><FONT size=3><FONT face="Comic Sans MS"><FONT
size=2></FONT></FONT></FONT> </DIV>
<DIV align=left><FONT size=3><FONT face="Comic Sans MS"
size=2>==========================</FONT></DIV></FONT>
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