Hello Markus,

With so small packets I think you will have them complete most at the
time.

---
Rgds, Wilfried [TeamICS]
http://www.overbyte.be/eng/overbyte/teamics.html
http://www.mestdagh.biz

Thursday, January 31, 2008, 19:43, Markus Humm wrote:

>> Hello Markus,
>> 
>> Fragmentation has nothing to do with ICS, it is IP issue and you cannot
>> influence it. 

> Ok, understood. I just thought to have seen a flag somewhere
> "don't fragment".

>> I think if you send packets smaller than MTU then chance
>> is lower that you get fragmentation. Also I think on a busy network
>> chance is higher. But what is the problem? Wy take the risk? Just
>> concatenate  received packeds in case you don't have the complete one.

> Sorry, you didn't fully understand what I wrote. On the PC side I have
> no problems concatenating several chunks of received data.

> On the other side I have no chance: a too long gap between 2 bytes is 
> regarded as new packet and the old is discarded because the checksum 
> would be wrong. This has nothing to do with TCP/IP but simply with the
> payload, means routing of another protocol over TCP.

> Tests on a otherwise not used LAN showed that TCP works fine in that 
> configuration, but other tests on a different (our company's real LAN)
> showed that I can cause trouble if I do a port scan on that TCP 
> interface converter. I'm not sure why this is and my test app. is a bit
> simplistic written.

> So rigth now I'm not sure whether I should tread that port scanning case
> as some unlikely cause or if I should say: TCP doesn't work reliably 
> enough for my case and look for other technologies. Thus the question 
> about fragmentation. My normal case will be a LAN, but if sales then 
> decides: oh using it for support via Internet I could maybe get into 
> trouble, but I sort of doubt it as my packets a < 64 byte.

> Greetings

> Markus

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