[p2p-hackers] ICMP on Win32

[Enzo Michelangeli]

UDP sockets may sometimes return error conditions due to the arrival of ICMP packets. http://tangentsoft.net/wskfaq/articles/bsd-compatibility.html says:

  According to Ilpo Ruotsalainen, "...most BSD socket implementations do not pass delayed UDP errors (ICMP port unreachable at least, maybe others too) to recvfrom() while Winsock 2 [under Windows 2000 but not Windows 98] does. Linux [behaves like Windows 2000] too, but provives SO_BSDCOMPAT setsockopt() for being compatible with the BSD style." 
See also the posting at http://lists.ximian.com/archives/public/mono-list/2004-February/018162.html .

It all sounds like a typical case of "your mileage may vary depending on the Windows version"...

Enzo

  ----- Original Message ----- 
  From: David Barrett 
  To: 'Peer-to-peer development.' 
  Sent: Saturday, May 07, 2005 12:44 PM
  Subject: [p2p-hackers] ICMP on Win32


  Does anyone here have experience receiving ICMP feedback for UDP packets on Win32?

   

  I don't know much about the topic (and am wondering if anyone who does know can tell me whether it's worth learning), but I'm interested in learning about UDP delivery failures, network congestion, timeouts, and so on.

   

  However, I've read it requires the use of "raw" sockets, which I've elsewhere read are being slowly prohibited - I think started with WinXP SP2.

   

  Anyway, can you recommend any good resources?  My ultimate goal is to weave this into my reliable UDP layer, but I'd like to hear from those who have gone before to see if it's worth the bother.

   

  -david

   



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