{"id":80085,"date":"2020-05-03T01:42:41","date_gmt":"2020-05-02T23:42:41","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/borba-za-millisekundy-kak-vybrat-server-s-naimenshim-pingom"},"modified":"2020-05-03T01:42:41","modified_gmt":"2020-05-02T23:42:41","slug":"borba-za-millisekundy-kak-vybrat-server-s-naimenshim-pingom","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/borba-za-millisekundy-kak-vybrat-server-s-naimenshim-pingom","title":{"rendered":"V\u00f5itlus millisekundite nimel. Kuidas valida madalaima pingiga serverit","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Paljude \u00fclesannete puhul on kliendi ja serveri vahelised viivitused kriitilise t\u00e4htsusega, n\u00e4iteks online-m\u00e4ngudes, video-\/h\u00e4\u00e4lekonverentsides, IP-telefonis, VPN-is jne. Kui server asub kliendist liiga kaugel IP-v\u00f5rgu tasandil, siis viivitused (rahva seas tuntud kui \"ping\", \"lag\") segavad t\u00f6\u00f6d. <\/p>\n<p>Serveri geograafiline l\u00e4heduse ei t\u00e4henda alati IP-ruteerimise tasandil l\u00e4hedust. N\u00e4iteks v\u00f5ib server teises riigis olla \"l\u00e4hemal\" kui server teie linnas. K\u00f5ik s\u00f5ltub ruteerimise ja v\u00f5rkude ehituse erip\u00e4radest.<\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/ruvds\/blog\/499878\/\"><img decoding=\"async\" alt=\"V\u00f5itlus millisekundite nimel. Kuidas valida madalaima pingiga serverit\" src=\"\/wp-content\/uploads\/2020\/05\/4c118ff8e61a3b7dfd5dd800df1762f9.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/p>\n<p>Kuidas valida serverit, mis on v\u00f5imalikult l\u00e4hedal k\u00f5igile potentsiaalsetele klientidele? Mis on IP-v\u00f5rkude seotuse t\u00e4hendus? Kuidas suunata klient l\u00e4himasse serverisse? Vaatame artiklis. <br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h2>M\u00f5\u00f5dame viivitusi<\/h2>\n<p>\nAlustuseks \u00f5pime m\u00f5\u00f5tma viivitusi. See \u00fclesanne ei ole nii lihtne, kui esmapilgul tundub, sest erinevate protokollide ja pakettide suuruste korral v\u00f5ivad viivitused erineda. Samuti ei pruugi m\u00e4rgata l\u00fchiajalisi n\u00e4htusi, n\u00e4iteks m\u00f5nemillisekundilisi katkemisi. <\/p>\n<h2>ICMP \u2014 tavaline ping<\/h2>\n<p>\nKasutame Unix'i t\u00f6\u00f6riista ping, mis v\u00f5imaldab k\u00e4sitsi seada pakettide saatmise vahemaid, mida Windowsi versioon ping ei oska. See on oluline, sest kui pakettide vahelised pausid on liiga pikad, ei pruugi me lihtsalt n\u00e4ha, mis nende vahel toimub. <\/p>\n<p><b>Paketi suurus<\/b> (valik -s) \u2014 vaikimisi saatab ping t\u00f6\u00f6riist 64-baidiseid pakette. Nii v\u00e4ikeste paketide puhul v\u00f5ivad olla m\u00e4rkamata n\u00e4htused, mis ilmnevad suuremate pakkide korral, seet\u00f5ttu seame paketi suuruseks 1300 baiti. <\/p>\n<p><b>Pakettide vaheline intervall<\/b> (valik -i) \u2014 aeg andmete saatmise vahel. Vaikimisi saadetakse paketid kord sekundis, mis on v\u00e4ga kaua, kuna p\u00e4ris programmid saadavad sadu ja tuhandeid pakette sekundis, seega seame intervalli 0.1 sekundile. V\u00e4hemale ei anna programm lihtsalt luba.<\/p>\n<p>L\u00f5ppude l\u00f5puks n\u00e4eb k\u00e4sk v\u00e4lja nii:<\/p>\n<pre><code class=\"plaintext\">ping -s 1300 -i 0.1 yandex.ru\n<\/code><\/pre>\n<p>\nSelline konstruktsioon v\u00f5imaldab n\u00e4ha realistlikumat viivituste pilti.<\/p>\n<h2>Ping UDP ja TCP kaudu<\/h2>\n<p>\nM\u00f5nel juhul t\u00f6\u00f6deldakse TCP-\u00fchendusi teisiti kui ICMP-pakette, mist\u00f5ttu m\u00f5\u00f5tmistulemused v\u00f5ivad erineda protokolli p\u00f5hjal. Tihti ei vasta host lihtsalt ICMP-le ja tavaline ping ei t\u00f6\u00f6ta. N\u00e4iteks on host seda kogu elu teinud. <b>microsoft.com<\/b>.<\/p>\n<p>T\u00f6\u00f6riist <noindex><a rel=\"nofollow\" href=\"https:\/\/nmap.org\/nping\/\">nping<\/a><\/noindex> tuntud skanneri nmap arendajatelt, suudab genereerida k\u00f5iki pakette. Seda saab kasutada ka viivituste m\u00f5\u00f5tmiseks. <br \/>\nKuna UDP ja TCP t\u00f6\u00f6tavad teatud portidel, peame 'pingima' konkreetset porti. Proovime pingi TCP 80, st veebiserveri porti:<\/p>\n<pre><code class=\"plaintext\">$ sudo nping --tcp -p 80 --delay 0.1 -c 0 microsoft.com\n\nK\u00e4ivitamine Nping 0.7.80 ( https:\/\/nmap.org\/nping ) 2020-04-30 13:07 MSK\nSAATIS (0.0078s) TCP 10.0.0.1:63236 &gt; 13.77.161.179:80 S ttl=64 id=49156 iplen=40  seq=3401731188 win=1480\nSAATIS (0.1099s) TCP 10.0.0.1:63236 &gt; 13.77.161.179:80 S ttl=64 id=49156 iplen=40  seq=3401731188 win=1480\nSAADUD (0.2068s) TCP 13.77.161.179:80 &gt; 10.0.0.1:63236 SA ttl=43 id=0 iplen=44  seq=1480267007 win=64240 \nSAATIS (0.2107s) TCP 10.0.0.1:63236 &gt; 13.77.161.179:80 S ttl=64 id=49156 iplen=40  seq=3401731188 win=1480\nSAADUD (0.3046s) TCP 13.77.161.179:80 &gt; 10.0.0.1:63236 SA ttl=43 id=0 iplen=44  seq=1480267007 win=64240 \nSAATIS (0.3122s) TCP 10.0.0.1:63236 &gt; 13.77.161.179:80 S ttl=64 id=49156 iplen=40  seq=3401731188 win=1480\nSAADUD (0.4247s) TCP 13.77.161.179:80 &gt; 10.0.0.1:63236 SA ttl=42 id=0 iplen=44  seq=2876862274 win=64240 \n\nMax rtt: 112.572ms | Min rtt: 93.866ms | Avg rtt: 101.093ms\nToorikud saadetud: 4 (160B) | Vastatud: 3 (132B) | Kaotatud: 1 (25.00%)\nNping valmis: 1 IP-aadress pingitud 0.43 sekundi jooksul\n<\/code><\/pre>\n<p>\nVaikimisi saadab nping 4 paketti ja peatub. Valik <b>-c 0<\/b> lubab pidevat pakettide saatmist, programm tuleb peatada, vajutades Ctrl+C. L\u00f5pus n\u00e4idatakse statistikat. N\u00e4eme, et keskmine rtt (round-trip time) v\u00e4\u00e4rtus on 101ms.<\/p>\n<h2>MTR \u2014 traceroute steroidide peal<\/h2>\n<p>\nProgramm <noindex><a rel=\"nofollow\" href=\"https:\/\/www.bitwizard.nl\/mtr\/\">MTR<\/a><\/noindex> (ingl. My Traceroute) \u2014 arenenud t\u00f6\u00f6riist kaughosti marsruudiga j\u00e4lgimiseks. Erinevalt tavalisest s\u00fcsteemiteenusest traceroute (Windowsis on see t\u00f6\u00f6riist tracert) suudab see n\u00e4idata viivitusi iga hostini, kuhu pakett liigub. Samuti oskab see marsruute j\u00e4lgida mitte ainult ICMP, vaid ka UDP ja TCP kaudu.<\/p>\n<pre><code class=\"bash\">$ sudo mtr microsoft.com<\/code><\/pre>\n<p>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/habrastorage.org\/webt\/ym\/dy\/id\/ymdyidxtjy3uqco5royohylfk6i.png\"><img decoding=\"async\" alt=\"V\u00f5itlus millisekundite nimel. Kuidas valida madalaima pingiga serverit\" src=\"\/wp-content\/uploads\/2020\/05\/6561b764af4f474985b5fb8e8acdea25.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><br \/>\n(Kliki) MTR programmi liides. Marsruudi j\u00e4lgimine microsoft.com juurde on k\u00e4imas. <\/p>\n<p>MTR n\u00e4itab kohe ping'i iga hosti kohta marsruudis, andmed uuenevad pidevalt, kui programm on k\u00e4imas, ja saab n\u00e4ha l\u00fchiajalisi muudatusi. <br \/>\nKuvatud ekraanipildil on n\u00e4ha, et s\u00f5lmes nr 6 on pakettide kaotus, kuid tegelikult ei ole see p\u00e4ris nii, kuna m\u00f5ned marsruuterid v\u00f5ivad lihtsalt j\u00e4tta aegunud TTL-iga paketid tagasi saatmata ning mitte anda veateadet, seega v\u00f5ib siinsed andmed pakettide kaotuse kohta ignoreerida. <\/p>\n<h2>WiFi vs kaabel<\/h2>\n<p>\n<img decoding=\"async\" alt=\"V\u00f5itlus millisekundite nimel. Kuidas valida madalaima pingiga serverit\" src=\"\/wp-content\/uploads\/2020\/05\/e74f6fb548aeb98ac490d8102bcf6777.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nSee teema ei ole t\u00e4iesti seotud artikliga, kuid minu arvates on see viivituste kontekstis v\u00e4ga oluline. Ma armastan WiFi-d, kuid kui mul on v\u00f5imalus internetti kaabli kaudu \u00fchendada, siis kasutan seda. Samuti heidan alati inimesi tagasi WiFi kaamerate kasutamisest. <br \/>\nKui m\u00e4ngite t\u00f5siseid veebivideosid, edastate voogedastust v\u00f5i kauplete b\u00f6rsil, palun kasutage kaabli\u00fchendust. <\/p>\n<p>Siin on visuaalne test WiFi ja kaabli\u00fchenduse v\u00f5rdlemiseks. See on ping WiFi ruuterile, seega ei ole see isegi veel internet.<\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/habrastorage.org\/webt\/v5\/nv\/va\/v5nvva7e1hwfakt4lucnahq9rfi.png\"><img decoding=\"async\" alt=\"V\u00f5itlus millisekundite nimel. Kuidas valida madalaima pingiga serverit\" src=\"\/wp-content\/uploads\/2020\/05\/699aa448b4fa8cba83224b13e72a7b72.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><br \/>\n(Kliki siia) WiFi ruuteri pingute v\u00f5rdlemine kaabli ja WiFi kaudu<\/p>\n<p>On n\u00e4ha, et WiFi kaudu on viivitused 1ms suuremad ja m\u00f5nikord on pakette, mille viivitused on k\u00fcmme korda suuremad! Ja see on ainult l\u00fchike ajavahemik. Samal ajal annab sama ruuter stabiilsed viivitused &lt;1ms. <\/p>\n<p>\u00dclaltoodud n\u00e4ites kasutatakse WiFi 802.11n 2.4GHz sagedusel, WiFi ligip\u00e4\u00e4supunktiga on \u00fchendatud ainult s\u00fclearvuti ja telefon. Kui ligip\u00e4\u00e4supunktis oleks rohkem kliente, oleks tulemused palju halvemad. Just sellep\u00e4rast olen vastu k\u00f5igi kontorite arvutite \u00fcleviimisele WiFi-le, kui on v\u00f5imalus neid kaabli kaudu \u00fchendada. <\/p>\n<h2>IP \u00fchendus<\/h2>\n<p>\nNii et oleme \u00f5ppinud m\u00f5\u00f5tma viivitusi serverini, proovime leida meie l\u00e4hedal asuva serveri. Selleks saame vaadata, kuidas meie teenusepakkuja marsruudistamine on organiseeritud. Selleks on mugav kasutada teenust <noindex><a rel=\"nofollow\" href=\"https:\/\/bgp.he.net\/\">bgp.he.net<\/a><\/noindex><\/p>\n<p><img decoding=\"async\" alt=\"V\u00f5itlus millisekundite nimel. Kuidas valida madalaima pingiga serverit\" src=\"\/wp-content\/uploads\/2020\/05\/d244ab29154fcda30740ae0a202270f4.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSaitidele sisenedes n\u00e4eme, et meie IP-aadress kuulub autonoomsele s\u00fcsteemile <noindex><a rel=\"nofollow\" href=\"https:\/\/bgp.he.net\/AS42610\">AS42610<\/a><\/noindex>. <\/p>\n<p>Vaadates autonoomsete s\u00fcsteemide seotuse graafikut, saame n\u00e4ha, mille kaudu meie pakkuja on seotud \u00fclej\u00e4\u00e4nud maailmaga. Iga punkt on klikkitav, v\u00f5imaldades tutvuda, mis ettev\u00f5te see on. <\/p>\n<p><img decoding=\"async\" alt=\"V\u00f5itlus millisekundite nimel. Kuidas valida madalaima pingiga serverit\" src=\"\/wp-content\/uploads\/2020\/05\/1a17f2ead00117fb849a1f8bcf29ddb0.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nAutonoomsete s\u00fcsteemide seotuse graafik pakkuja jaoks<\/p>\n<p>Selle t\u00f6\u00f6riista abil on v\u00f5imalik uurida, kuidas on seotud mis tahes pakkujate kanalid, sealhulgas hostimine. Vaadake, millega nad on otse \u00fchendatud. Selleks tuleb otsingusse sisestada bgp.he.net IP-aadress ja vaadata tema autonoomse s\u00fcsteemi graafikut. Samuti v\u00f5ib m\u00f5ista, kuidas \u00fcks andmekeskus v\u00f5i hostingu pakkuja on seotud teisega.<\/p>\n<p>Enamik t\u00f5hususe vahetuspunktidest pakub spetsiaalset t\u00f6\u00f6riista, mida nimetatakse looking glass, mis v\u00f5imaldab teha ping'i ja traceroute'i konkreetse ruuteri k\u00fcljest vahetuspunktis. <\/p>\n<p>N\u00e4iteks <noindex><a rel=\"nofollow\" href=\"http:\/\/lg.mtu.ru\/cgi-bin\/lgform_img.cgi\">looking glass<\/a><\/noindex> MTT kaudu <\/p>\n<p>Nii et serveri valida, saame eelnevalt vaadata, kuidas ta v\u00e4lja n\u00e4eb erinevatest t\u00f5hususe vahetuspunktidest. Ja kui meie potentsiaalsed kliendid asuvad teatud geograafilises piirkonnas, saame leida optimaalse serveri asukoha. <\/p>\n<h2>Valime l\u00e4hima serveri<\/h2>\n<p>\nOleme otsustanud lihtsustada meie klientide jaoks optimaalse serveri leidmise protsessi ja loonud lehe automaatse l\u00e4hima asukohtade testi jaoks: <noindex><a rel=\"nofollow\" href=\"https:\/\/ruvds.com\/ru-rub\/data\/rus\">RUVDS andmekeskused<\/a><\/noindex>.<br \/>\nLehe k\u00fclastamisel m\u00f5\u00f5dab skript viivituseid teie brauserist igasse serverisse ja kuvab need interaktiivsel kaardil. Andmekeskusele klikkides kuvatakse testitulemuste teave.<\/p>\n<p><img decoding=\"async\" alt=\"V\u00f5itlus millisekundite nimel. Kuidas valida madalaima pingiga serverit\" src=\"\/wp-content\/uploads\/2020\/05\/93e94a3df81acaa70fe33c454d020b56.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/ruvds.com\/ru-rub\/data\/rus\"><img decoding=\"async\" alt=\"V\u00f5itlus millisekundite nimel. Kuidas valida madalaima pingiga serverit\" src=\"\/wp-content\/uploads\/2020\/05\/bae555cc04c5060f976aa49218505b93.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/p>\n<p>Nupp viib teid viivituste testimise lehele k\u00f5igi meie andmekeskuste juurde. Testimistulemuste vaatamiseks kl\u00f5psake kaardil andmekeskuse punkti<\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/ruvds.com\/?utm_source=habr&amp;utm_medium=zhovner&amp;utm_campaign=borbazamillesekundi\"><img decoding=\"async\" alt=\"V\u00f5itlus millisekundite nimel. Kuidas valida madalaima pingiga serverit\" src=\"\/wp-content\/uploads\/2020\/05\/9ffced6bbcd5a2dd949d662cb4c51a39.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><br \/>\n<br \/>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/ruvds\/blog\/499878\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0414\u043b\u044f \u043c\u043d\u043e\u0433\u0438\u0445 \u0437\u0430\u0434\u0430\u0447 \u0437\u0430\u0434\u0435\u0440\u0436\u043a\u0438 \u043c\u0435\u0436\u0434\u0443 \u043a\u043b\u0438\u0435\u043d\u0442\u043e\u043c \u0438 \u0441\u0435\u0440\u0432\u0435\u0440\u043e\u043c \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0438 \u0432\u0430\u0436\u043d\u044b, \u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440 \u0432 \u043e\u043d\u043b\u0430\u0439\u043d \u0438\u0433\u0440\u0430\u0445, \u0432\u0438\u0434\u0435\u043e\/\u0433\u043e\u043b\u043e\u0441\u043e\u0432\u044b\u0445 \u043a\u043e\u043d\u0444\u0435\u0440\u0435\u043d\u0446\u0438\u044f\u0445, IP \u0442\u0435\u043b\u0435\u0444\u043e\u043d\u0438\u0438, VPN \u0438 \u0442.\u0434. \u0415\u0441\u043b\u0438 \u0441\u0435\u0440\u0432\u0435\u0440 \u0431\u0443\u0434\u0435\u0442 \u0441\u043b\u0438\u0448\u043a\u043e\u043c \u0443\u0434\u0430\u043b\u0435\u043d \u043e\u0442 \u043a\u043b\u0438\u0435\u043d\u0442\u0430 \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 IP-\u0441\u0435\u0442\u0438, \u0442\u043e \u0437\u0430\u0434\u0435\u0440\u0436\u043a\u0438 (\u0432 \u043d\u0430\u0440\u043e\u0434\u0435 \u00ab\u043f\u0438\u043d\u0433\u00bb, \u00ab\u043b\u0430\u0433\u00bb) \u0431\u0443\u0434\u0443\u0442 \u043c\u0435\u0448\u0430\u0442\u044c \u0440\u0430\u0431\u043e\u0442\u0435. \u0413\u0435\u043e\u0433\u0440\u0430\u0444\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0431\u043b\u0438\u0437\u043e\u0441\u0442\u044c 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