On 5/17/06, Robert Lewko <[EMAIL PROTECTED]> wrote: > Hi guys: > > I have a program that sends UDP messages to its server. Its been working > just fine for about a week since I delivered it. At about 2:00pm. my client > phoned me to say that the server wasn't working. When I looked at the > software (putting fprintf''s into it) I could see that it was processing the > packets that it receives and sending the correct data back. I can ssh into > the server and on both the server and the firewall I can use tcpdump to see > the packet coming in and the packet leaving the server then making its way > out of the firewall. However, ethereal does not see the packet return to > the client. This affects me at home (shaw) and my client at his work site > (telus). > > One other thing. For brief periods this afternoon I was getting packets > through without making any changes either to the code, the server or the > client machines. > > I am using UDP because the client is using a satellite modem. The server > uses UDP port 9608. When the server gets a packet it just gets the source > address and returns the response packet to the sender. Like I said I have > had no problem with that port both while I have been developing the code and > for the last week until this afternoon. > > All the TCP stuff works - ssh, http, https, etc. Does anyone know how to > diagnose this?
You could try using a UDP "ping" program to see if your packets are all getting lost. Thats about the only thing I can think of that you haven't tried yet. Good luck, UDP can get nasty. HTH -Mark P.S. IIRC UDP is highly sensitive to packet loss, since you are going over satellite, you may want to consider "solar activity" http://www.spaceweather.gc.ca/forecastmap_e.php If you check the past 24 hour conditions right now, you'll see that in the aural region (north of here) there was some "active intervals." I don't know if this would have had an effect... I just think its funny that the government has a space weather agency. _______________________________________________ clug-talk mailing list [email protected] http://clug.ca/mailman/listinfo/clug-talk_clug.ca Mailing List Guidelines (http://clug.ca/ml_guidelines.php) **Please remove these lines when replying
