Problems with getting more than 64Kbytes.

[OferTs]

Hi,

I have written an UDP client using winsock control in vb6.
When i load from server quantity of bytes till 64k the operation is succesful.
When the file size in bytes is more than 64k the win socket stops getting data. I think that the winsock buffer is full and need to be cleared. Am i right? and if it so how can i clear it? if it isn't the reason what it can be? I am really struggling to findout what makes this behaviour.

can anyone please help me...

Thanking you in advance.

Best regards

Ofer

[ccoder]

Check out this (http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vbcon98/html/vbcondatalimitations.asp) article.

[dilettante]

Winsock Programmer's FAQ: The Lame List (http://tangentsoft.net/wskfaq/articles/lame-list.html)
27. Assuming that a UDP datagram of any length may be sent. Criminally lame.

Reason: Various networks all have their limitations on maximum transmission unit (MTU). As a result, fragmentation will occur, and this increases the likelihood of a corrupted datagram (more pieces to lose or corrupt). Also, the TCP/IP service providers at the receiving end may not be capable of re-assembling a large, fragmented datagram.

Alternative: Check for the maximum datagram size with the SO_MAX_MSG_SIZE socket option, and don't send anything larger. Better yet, be even more conservative. A max of 8K is a good rule-of-thumb.
Network support for the Lua language (http://www.cs.princeton.edu/~diego/professional/luasocket/udp.html)
The maximum datagram size for UDP is 64K minus IP layer overhead. However datagrams larger than the link layer packet size will be fragmented, which may deteriorate performance and/or reliability.
To misquote Obi Wan Kenobi, UDP "isn't the protocol you're looking for."

[OferTs]

Thank you.
I makes a project for a large company with branches abroad.
I solved this problem. The server which my program conects has a range of
addresses, and my software sent it incorrect addresses because of a bug in addresses increamenting routine, so it stopped after address 64k.
Now i have a new problem.
Assuming my application has no bugs, can you tell me why do i get error message from server: "Remote host reset connection", and what can i do to renew the connection, except for restarting my computer.
I appreciates your help.
Ofer.