[PD] Connection with UDP transport protocol using [netsend] or [udpsend]

[Jack]

Hello Frank,

You haven't read my previous mail ;)
Yep, i know with UDP protocol, you can loose TPDU. This is the risk  
with it. You needn't any aknowledgement, any error detection/ 
correction or flow detection, etc.
My problem is :

I have a problem to understand  a behaviour with the UDP transport
protocol.
When i connect to computer together using :

Host A -> 802.3 -> Router with bridge fonction -> 802.11 -> Host B

On Host A :

[100(
|
[until]
|
[f  ]x[+ 1]
|
[send $1(
|
[netsend 1] or [udpsend]

On Host B :

[netreceive 1] or [udpreceive]
|
[print]

1)
When i click on [100(, [netreceive 1] or [udpreceive]  receive only
numbers between 48 and 69, so there is 78 number drop ! I know this a
UDP protocol but my network is very simple (and i think there is not
a lot of perturbations on it). It is normal ?

2)
The other problem is strange for me :
Why it is only numbers between 48 and 69 that arrive on the host B
and not numbers between 34 and 56 or something else ? It's always the
same TPDU that are lost ? Strange no ?

Thanx.
++

Jack


Le 2 févr. 09 à 17:13, Frank Barknecht a écrit :

> Hallo,
> Jack hat gesagt: // Jack wrote:
>
>> In fact with TCP, everything works fine (that the aim of this
>> protocol) with [until].
>> If it works with TCP, it should work with UDP (or i'm wrong).
>
> You are a little bit wrong: The possibility to lose messages (i.e.
> packets) is one of the "advantages" of UDP over TCP. See
> http://en.wikipedia.org/wiki/ 
> User_Datagram_Protocol#Difference_between_TCP_and_UDP
>
> Ciao
> -- 
> Frank
>
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