Thread View: borland.public.cppbuilder.internet.socket
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Started by Andrue Cope [TeamB]
Mon, 15 Aug 2005 13:38
VPN network issue
Author: Andrue Cope [TeamB]
Date: Mon, 15 Aug 2005 13:38
Date: Mon, 15 Aug 2005 13:38
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We have a VPN that connects all our offices around the world. Some time in the last six months something changed that has broken one of our applications. The application uses TCustomWinSocket in non-blocking mode to send data. The application works fine within a single office (not terribly helpful) but experiences difficulty between different offices. The symptoms are: * Terrible performance. Commands appear to be being received a dozen or more seconds after they have actually been sent. It incorporates a simple chat client but the delay is unbelievable. Typically typing 'hello' and pressing [return] results in the string appearing at the other end after over 20 seconds! It can even appear after the sender closed the connection but then the reporting of the closed connection takes 20 seconds. It's like there's a time delay in the network :-/ * Packet blockage. Some commands simply never get transmitted at all. Oddly it seems to be the server responses that never get sent. This is weird. The server will always (eventually!) see the client request and respond to it but the client never sees the server acknowledgement packet. This is true no matter where the client/server are located. Obviously this is some kind of network configuration issue but our IT guy isn't aware of any change. We're stumped. FWIW we also have commercial proxy software and this is still working. Can anyone shed any light on where we might look to investigate this? -- Andrue Cope [TeamB] [Bicester, Uk] http://info.borland.com/newsgroups/guide.html
Re: VPN network issue
Author: Andrue Cope [TeamB]
Date: Mon, 15 Aug 2005 13:39
Date: Mon, 15 Aug 2005 13:39
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Andrue Cope [TeamB] wrote: > The application works fine within a single office (not terribly > helpful) but experiences difficulty between different offices. Ah, FWIW each offices has its own firewall. -- Andrue Cope [TeamB] [Bicester, Uk] http://info.borland.com/newsgroups/guide.html
Re: VPN network issue
Author: Bob Gonder
Date: Sat, 20 Aug 2005 04:13
Date: Sat, 20 Aug 2005 04:13
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On 15 Aug 2005 06:38:25 -0700, you wrote: >We have a VPN that connects all our offices around the world. Some time >in the last six months something changed that has broken one of our >applications. The application uses TCustomWinSocket in non-blocking >mode to send data. > >* Terrible performance. >Commands appear to be being received a dozen or more seconds after they >have actually been sent. It incorporates a simple chat client but the You didn't accidentally turn on buffering, did you? Small packets can get delayed if TCP is waiting for a full buffer before sending. I know next to nothing about firewalls (other than they seem to work), but maybe they've been "upgraded" to stop pesky DOS attacks of swarms of small packets. Throwing out the good ones with the "bad". (You may or may not accidentally receive a copy of this in email)
Re: VPN network issue
Author: Andrue Cope [TeamB]
Date: Mon, 22 Aug 2005 08:29
Date: Mon, 22 Aug 2005 08:29
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Bob Gonder wrote: > You didn't accidentally turn on buffering, did you? That's an interesting idea, I'll pass that one. It doesn't help that atm our main IT guy is in America and is using Proxy to control our firewall. It makes it awkward :) -- Andrue Cope [TeamB] [Bicester, Uk] http://info.borland.com/newsgroups/guide.html
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