udp "connections"

[Christos Ricudis]

Hello Linux-greek-users!

  On 29 Dec 98, Linux-greek-users wrote to All with subject "udp
"connections"":

 L> esto oti 8elo na kano udp epikoinonia kai na elenxo an
 L> pragmatopoiitai sosta..

To UDP einai connectionless, non-reliable datagram transport service.
Ousiastika einai ena user interface epanw sto IP, kai tipote parapanw.

 L> me tin connect() katarxin se udp mode den mou bgazei pote la8os.

Ena connectionless protocol den prokeitai pote na sou epistrepsei la8os sthn
connect(), giati h connect() den kanei tipota :>.

 L> meta oi send() kai sendto() den sou lene an eftasan ta data sosta
 L> ap oti eida sto man page.

Fysika, afou den to kseroyn.

 L> ektos apo na kano checksum kai stis 2 plevres kai na apantao
 L> analoga, iparxei kapoios allos tropos oste na min xreiazetai
 L> na ginetai to check apo emena alla na ginetai apo to idio to udp?

Afou 8eleis reliable service, giati den xrhsimopoieis TCP?

O monos tropos na kaneis ayto poy 8eleis einai na kaneis implement enan diko
sou mhxanismo elegxou epanw sto UDP. Praktika to mono poy aksizei na kaneis
einai ena aplo ARQ scheme me timeout. Den einai effective, alla einai aplo, kai
mporei na sou dwsei mia lysh sto problhma sou. Gia na to kaneis effective 8a
prepei na kaneis implement kapoio windowing scheme kai na xrhsimopoihseis
streaming, alla tote aplws kaneis re-implement to TCP :>. 

--
Christos Ricudis
"Windows has detected that a gnat has farted near your computer. Press any
 key to reboot". - anonymous in ASR.    
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