lug-bg: Chupene na tcp konekcii.
- Subject: lug-bg: Chupene na tcp konekcii.
- From: bkrosnov@xxxxxxxx (Boyan Krosnov)
- Date: Tue, 4 Dec 2001 16:25:51 +0200
Tova sa tcp konekcii ot teb doklientite ili obratno i nqmat nishto
obshto s interneta ti nali?
Spored men stawa duma za kratkowremenni prekyswaniq na swyrzanostta m/u
teb i klientite ti ili masiwno pretowarwane(primerno ako 2-ma - 3-ma
teglqt s vampir ot nqkyde a ti se opitwash prez towa wreme da nabutash
poshtata prez wryzka koqto e 8KB obshto).
Wyzmojno e da e i QoS problem. Podsiguri se da imash opashki (WFCBQ,
WFQ, traffic-shape, dylgo fifo) na wsichki tesni mesta w mrejata, a ne
twyrdo dropene na paketi (WRED, rate-limit, kyso fifo), taka tcp-to shte
moje da se adaptira kym skorostta na wryzkata po-dobre. I ako imash
weche opashki (osobenno na mqstoto kydeto gi shape-wash) dali sa
dostatychno golemi za da se sprawqt s pretowarwaneto na wryzkata. Pri
20-30% dropowe (poradi pretowarwane ili ne) tcp-to se dyrji nestabilno.
Pri okolo 1% dropowe TCP-to ima problemi s "useshtaneto" na istinskata
skorost na wryzkata. Syshto mnogo se shashka ot promenlivi delay-i,
primerno wireless lan wryzki w zashumen efir.
Have fun,
CCNP Boyan Krosnov
Network Administrator
Lirex Net
phone: +359-2-91815
> -----Original Message-----
> From: Nickola Kolev [mailto:nikky@xxxxxxx]
> Sent: Tuesday, December 04, 2001 10:17 AM
> To: lug-bg@xxxxxxxxxxxxxxxxxx
> Subject:
>
>
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>
> Çäðàâåéòå, lug-bg,
>
> Ðàáîòÿ â êàáåëåí îïåðàòîð, êîéòî ïðîäàâà Èíòåðíåò âúâ Âàðíà -
> ÌÍÅÒ. Îò èçâåñòíî
> âðåìå íàñàì ñå ñáëúñêâàì ñ îñîáåí ïðîáëåì, íà êîéòî íå ìîãà äà
> íàìåðÿ ðåøåíèå. Áèõ
> áèë èçêëþ÷èòåëíî áëàãîäàðåí, àêî íà íÿêîé ìó õðóìíå êúäå ìîæå
> äà ñå êðèå ðåøåíèåòî.
>
> Òà çíà÷è òàêà... Ïðåíîñíàòà ñðåäà ñå îñúùåñòâÿâà ïîñðåäñòâîì ê
> àáåëíà ñòàíöèÿ
> (CMTS) è ìîäåìè, â ñëó÷àÿ RCA Thomson. Êëèåíòèòå ïîëó÷àâàò íåã
> àðàíòèðàí Èíòåðíåò,
> êàòî upstream è downstråam ñà àñèìåòðè÷íè, ò.å. ds ìîæå äà å
> 64Êáèòà, à us äà å
> 32Êáèòà. Îò òàêàâà óñëóãà ñå ïîëçâàò è ôèðìè, êîèòî ïúê èìàò ä
> îñòà ãîëÿì îáåì
> ïîùåíñêè òðàôèê. Òóê çàïî÷âàò è ïðîáëåìèòå. Ïðè îïèò äà ñå èçï
> ðàòè ñúîáùåíèå,
> êîåòî å ñðàâíèòåëíî ãîëÿìî ïî îáåì, äà ðå÷åì 3ÌÁ, ñå ïîÿâÿâàò åäíè
> ùóðè ñúîáùåíèÿ çà ãðåøêè, êîíåêöèèòå óìèðàò, ñëåä êîåòî òðÿáâà
> äà çàïî÷âàò
> îòíà÷àëî.
> Íàïðèìåð íåùî îò ñîðòà:
> Dec 3 13:52:16 home sendmail[29079]: fB39m1829079:
> SYSERR(root): collect: I/O error on connection from ipXXX,
> from=<xxx@xxxxxxx>: Connection reset by ipXXX
>
> Èëè ïúê:
> Dec 3 14:42:15 home sendmail[29659]: fB3CLf829659: collect:
> premature EOM: Error 0
> Dec 3 14:42:15 home sendmail[29659]: fB3CLf829659: collect:
> unexpected close on connection from ipXXX,
> sender=<ala@xxxxxxxx>: Error 0
>
> Íå çíàÿ êúäå ìîæå äà å ïðîáëåìà. Îïèòàõ ñå äà ïðîìåíÿ ñúîòíîøå
> íèåòî ìåæäó us è ds,
> è òîãàâà ðàáîòèòå ñå ïîñòàáèëèçèðàõà ìàëêî, íî òîâà ïîëîæåíèå
> íå ìè õàðåñâà.
> Ïðåäïîëàãàì, ÷å èìà ïðîáëåìè è ïî ñàìàòà ïðåíîñíà ñðåäà êàòî ñ
> èëà íà ñèãíàëà,
> ñúîòíîøåíèÿ ñèãíàë/øóì è ò.í., è ò.í.
>
> Áëàãîäàðÿ ïðåäâàðèòåëíî.
>
>
>
> Âñè÷êî íàé-õóáàâî,
> Íèêîëà
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