{"id":2108,"date":"2026-09-07T09:24:02","date_gmt":"2026-09-07T06:24:02","guid":{"rendered":"https:\/\/www.bigsbilisim.com\/?p=2108"},"modified":"2026-09-07T09:24:02","modified_gmt":"2026-09-07T06:24:02","slug":"everyone-was-an-expert-nobody-checked-layer-1","status":"publish","type":"post","link":"https:\/\/www.bigsbilisim.com\/tr\/everyone-was-an-expert-nobody-checked-layer-1\/","title":{"rendered":"Herkes uzmand\u0131. Kimse 1. katman\u0131 kontrol etmedi."},"content":{"rendered":"

Baz\u0131 biletler beraberinde hafif bir endi\u015fe bulutuyla gelir.<\/p>\n

Bu sipari\u015f, birlikte \u00e7al\u0131\u015fmaktan ger\u00e7ekten keyif ald\u0131\u011f\u0131m bir m\u00fc\u015fteriden geldi: tamamen uzaktan \u00e7al\u0131\u015fan bir \u015firket. herkes<\/em> Teknik alanda \u00e7al\u0131\u015fanlar. Geli\u015ftiriciler, DevOps m\u00fchendisleri, sistem y\u00f6neticileri. \u0130nternetin nereye gitti\u011fini kibarca soran bir muhasebe departman\u0131 yok. Monit\u00f6re "bilgisayar" diyen bir sat\u0131\u015f eleman\u0131 da yok. Bunlar, ba\u015fkalar\u0131n\u0131n dokunmaya korktu\u011fu da\u011f\u0131t\u0131m s\u00fcre\u00e7lerini yazan ki\u015filer.<\/p>\n

T\u00fcm altyap\u0131 bulutta yer al\u0131yor. Kullan\u0131c\u0131lar, testleri \u00e7al\u0131\u015ft\u0131rmak ve da\u011f\u0131t\u0131mlar\u0131 ger\u00e7ekle\u015ftirmek i\u00e7in VPN \u00fczerinden bu ortama ba\u011flan\u0131yor. VPN ba\u011flant\u0131s\u0131 kesilirse, \u00e7al\u0131\u015fma durur. "Yava\u015flamaz", tamamen durur.<\/p>\n

Yani bilette \u015f\u00f6yle yaz\u0131yordu: \u201c"K\u0131demli geli\u015ftirici VPN'e ba\u011flanam\u0131yor."\u201d<\/strong> Beynim, 26 y\u0131ll\u0131k BT operasyonlar\u0131 deneyiminin bir beyne \u00f6\u011fretti\u011fi \u015feyi yapt\u0131.<\/p>\n

\u00c7ok organize bir \u015fekilde pani\u011fe kap\u0131ld\u0131.<\/p>\n

Zihinsel felaket filmi hemen ba\u015fl\u0131yor.<\/h2>\n

Teknik odakl\u0131 bir \u015firkette k\u0131demli birinden gelen bir destek talebiyle ilgili \u015f\u00f6yle bir durum var: Kolay a\u00e7\u0131klamalar\u0131 otomatik olarak atl\u0131yorsunuz. Zaten kolay a\u00e7\u0131klamalar\u0131 yapt\u0131klar\u0131n\u0131 varsay\u0131yorsunuz. Hatta iki kez yapt\u0131klar\u0131n\u0131, bunun i\u00e7in bir komut dosyas\u0131 yazd\u0131klar\u0131n\u0131 ve \u00f6zel bir depoya y\u00fcklediklerini varsay\u0131yorsunuz.<\/p>\n

Yani yakla\u015f\u0131k on bir saniye i\u00e7inde kafamda koca bir kriz kurgulam\u0131\u015ft\u0131m:<\/p>\n

    \n
  • Sertifikam\u0131n s\u00fcresi mi doldu? Sertifikalar\u0131n s\u00fcresi, benim planlar\u0131m\u0131n oldu\u011fu g\u00fcnlere denk gelmeyi \u00e7ok seviyor.<\/li>\n
  • D\u00fcn gece bulut ortam\u0131nda bir g\u00fcvenlik duvar\u0131 kural\u0131 m\u0131 de\u011fi\u015ftirildi?<\/li>\n
  • Y\u00f6nlendirme sorunu mu? DNS sorunu mu? Her zaman DNS'tir. Herkes her zaman DNS oldu\u011funu s\u00f6yl\u00fcyor. Bu art\u0131k bir do\u011fa kanunu gibi.<\/li>\n
  • \u0130nternet servis sa\u011flay\u0131c\u0131s\u0131 VPN protokol\u00fcn\u00fc engelliyor mu?<\/li>\n
  • Bu ilk domino ta\u015f\u0131 m\u0131 ve yirmi dakika i\u00e7inde t\u00fcm ekip ba\u011flant\u0131 kuramayacak m\u0131?<\/li>\n<\/ul>\n

    Listede neyin eksik oldu\u011funu fark ettiniz. Ben de sonradan fark ettim. Bir dakika bekleyin.<\/p>\n

    Ger\u00e7ekle\u015fmeyen uzaktan oturum<\/h2>\n

    Onu arad\u0131m. Cana yak\u0131n bir adamd\u0131, belli ki sinirliydi ama bana de\u011fil, as\u0131l hedef olan makineye sinirliydi. Masa\u00fcst\u00fcne ba\u011flan\u0131p VPN istemci g\u00fcnl\u00fcklerini kendim inceleyebilmek i\u00e7in uzaktan eri\u015fim bilgilerini istedim.<\/p>\n

    Onlar\u0131 bana verdi. Ben de bilgisayara yazd\u0131m.<\/p>\n

    Hi\u00e7 bir \u015fey.<\/p>\n

    Parmaklar\u0131m\u0131z\u0131n bizi yan\u0131ltt\u0131\u011f\u0131na ikna oldu\u011fumuzda hepimizin yapt\u0131\u011f\u0131 gibi, daha yava\u015f bir \u015fekilde tekrar denedim. Yine de hi\u00e7bir \u015fey olmad\u0131. Oturum yok. Ne "eri\u015fim reddedildi", ne de "yanl\u0131\u015f \u015fifre". Sadece bo\u015f bir tarlada kap\u0131y\u0131 \u00e7alman\u0131n dijital kar\u015f\u0131l\u0131\u011f\u0131.<\/p>\n

    Ve i\u015fte tam bu anda, e\u011fer \u015fansl\u0131ysan\u0131z, kafan\u0131z\u0131n arkas\u0131ndaki o k\u00fc\u00e7\u00fck ses nihayet bo\u011faz\u0131n\u0131 temizler.<\/p>\n

    \u00c7\u00fcnk\u00fc uzaktan destek arac\u0131n\u0131n ba\u011flant\u0131 kuramamas\u0131 bir VPN belirtisi de\u011fildir. Bu tamamen farkl\u0131 bir durumdur.<\/p>\n

    Katmanlar\u0131 teker teker, s\u0131k\u0131c\u0131 bir \u015fekilde a\u015fa\u011f\u0131 inerek.<\/h2>\n

    Bu y\u00fczden dokuzuncu dakika yerine birinci dakikada yapmam gereken \u015feyi yapt\u0131m. "VPN'i bir saniyeli\u011fine kapatal\u0131m. Ba\u011flant\u0131n\u0131n kendisinde birlikte birka\u00e7 h\u0131zl\u0131 kontrol yapabilir miyiz?" dedim.\u201c<\/p>\n

    Komut istemini a\u00e7t\u0131k. Temel Windows ba\u011flant\u0131 testleri. Uyurken bile yazabilece\u011finiz t\u00fcrden komutlar, k\u0131demli bir geli\u015ftiriciye anlatmaktan neredeyse utanaca\u011f\u0131n\u0131z t\u00fcrden, t\u0131pk\u0131 bir \u015fefe ha\u015flanm\u0131\u015f yumurta tarifi vermek gibi.<\/p>\n

    Hi\u00e7bir \u015fey yan\u0131t vermedi. Hi\u00e7bir \u015fey.<\/p>\n

    Sonra olabildi\u011fince nazik bir \u015fekilde sordum: "Bunu elemek i\u00e7in soruyorum - e-postalar\u0131n\u0131z\u0131 a\u00e7abiliyor musunuz? Ya da herhangi bir web sitesini?"\u201c<\/p>\n

    Telefonda k\u0131sa bir duraklama.<\/p>\n

    Daha uzun bir ara.<\/p>\n

    \u201c"\u2026HAYIR."\u201d<\/p>\n

    Adam\u0131n interneti yoktu.<\/p>\n

    Yava\u015f internet de\u011fil. Kesintili internet de\u011fil. "VPN garip davran\u0131yor" t\u00fcr\u00fcnden bir internet de\u011fil. Onun vard\u0131. s\u0131f\u0131r<\/em> Ba\u011flant\u0131 sorunu vard\u0131. E-posta y\u00fcklenmiyordu. Hi\u00e7bir \u015fey y\u00fcklenmiyordu. Sabah\u0131n bir noktas\u0131nda sessizce \u00e7\u00f6ken internet ba\u011flant\u0131s\u0131 \u00fczerinden bulut ortam\u0131na \u015fifreli bir t\u00fcnel kurmaya \u00e7al\u0131\u015f\u0131yordu.<\/p>\n

    VPN bozuk de\u011fildi. VPN, var olmayan bir nehrin \u00fczerine k\u00f6pr\u00fc in\u015fa etme konusunda m\u00fckemmel bir \u015fekilde ba\u015far\u0131s\u0131z oluyordu.<\/p>\n

    Ona ba\u011flant\u0131s\u0131n\u0131 geri almas\u0131n\u0131 ve tekrar denemesini s\u00f6yledim. Denedi. \u00c7al\u0131\u015ft\u0131. Destek talebi kapat\u0131ld\u0131. Toplam zarar: Ar\u0131za 1. katmanda sakin bir \u015fekilde fark edilmeyi beklerken, iki deneyimli ki\u015finin 7. katman\u0131 incelemesinin yakla\u015f\u0131k on be\u015f dakikas\u0131.<\/p>\n

    Uzaktan \u00e7al\u0131\u015fma \u00f6ncelikli, her \u015feyin bulutta oldu\u011fu \u00e7a\u011f\u0131n g\u00f6r\u00fcnmez varsay\u0131m\u0131<\/h2>\n

    \u0130\u015fte bu konuda ger\u00e7ekten ilgin\u00e7 buldu\u011fum ve h\u00e2l\u00e2 \u00fczerinde d\u00fc\u015f\u00fcnd\u00fc\u011f\u00fcm noktalar.<\/p>\n

    Yirmi y\u0131l \u00f6nce, bir ofiste, internet ba\u011flant\u0131s\u0131n\u0131n kesilmesi kendini y\u00fcksek sesle duyurdu. Biri aya\u011fa kalkt\u0131. Sonra \u00fc\u00e7 ki\u015fi daha aya\u011fa kalkt\u0131. Doksan saniye i\u00e7inde yaz\u0131c\u0131n\u0131n yan\u0131nda k\u00fc\u00e7\u00fck bir ayakta duran komite olu\u015ftu ve biri \u00e7oktan hava durumu uyar\u0131s\u0131 gibi bir y\u00fcz ifadesiyle sunucu odas\u0131na do\u011fru y\u00fcr\u00fcyordu. Ba\u011flant\u0131 hatas\u0131 bir sosyal etkinlik<\/em>.<\/p>\n

    \u015eimdi mi? Herkes evde tek ba\u015f\u0131na \u00e7al\u0131\u015f\u0131yor. Her ara\u00e7 bulutta. Ba\u011flant\u0131 oksijen gibi oldu; tamamen gerekli ve yere y\u0131\u011f\u0131lana kadar tamamen fark edilmiyor. Evde internetiniz kesildi\u011finde kimse aya\u011fa kalkm\u0131yor. Kimse masan\u0131z\u0131n yan\u0131ndan ge\u00e7miyor. Olan tek \u015fey, kulland\u0131\u011f\u0131n\u0131z belirli bir uygulaman\u0131n \u015fikayet etmeye ba\u015flamas\u0131 ve beyninizin \u015f\u00f6yle demesi: "Ah. Bu uygulama bozulmu\u015f."\u201c<\/p>\n

    Hay\u0131r, \u00f6yle de\u011fil. Uygulaman\u0131n alt\u0131ndaki zemin yok olmu\u015f. Ama g\u00fcr\u00fclt\u00fc \u00e7\u0131karan tek \u015fey uygulama oldu\u011fu i\u00e7in su\u00e7 uygulamaya at\u0131l\u0131yor.<\/p>\n

    Birinci ders: uzmanl\u0131k sizi s\u0131f\u0131r\u0131nc\u0131 ad\u0131mdan muaf tutmaz.<\/h2>\n

    Bu hik\u00e2yedeki ki\u015fi, binlerce insan\u0131n g\u00fcvendi\u011fi yaz\u0131l\u0131mlar yaz\u0131yor. A\u011f ileti\u015fimi konusunda, tan\u0131d\u0131\u011f\u0131m \u00e7o\u011fu destek m\u00fchendisinden daha bilgili. Ve yine de, 1. katman \u00e7\u00f6km\u00fc\u015fken sabah\u0131n\u0131 7. katman\u0131 hata ay\u0131klayarak ge\u00e7irdi.<\/p>\n

    Bu ona y\u00f6nelik bir ele\u015ftiri de\u011fil. As\u0131l mesele bu zaten.<\/p>\n

    K\u0131dem, katmanlar\u0131 atlaman\u0131za izin vermez. Sadece daha h\u0131zl\u0131 ve daha g\u00fcvenli bir \u015fekilde atlaman\u0131z\u0131 sa\u011flar. Ne kadar \u00e7ok \u015fey bilirseniz, beyniniz o kadar ilgin\u00e7 hipotez \u00fcretebilir ve bu ilgin\u00e7 hipotezler, en alttaki son derece s\u0131k\u0131c\u0131 hipoteze k\u0131yasla o kadar \u00e7ekici g\u00f6r\u00fcn\u00fcr.<\/p>\n

    Uzmanl\u0131k sizi temel bilgilerden korumaz. Sadece onlar\u0131 atlaman\u0131z i\u00e7in daha iyi bahaneler sunar.<\/p><\/blockquote>\n

    Ve kimse kendini be\u011fenmi\u015flik yapmadan \u00f6nce \u015funu s\u00f6yleyeyim: Ben de kesinlikle o ki\u015fiydim. Bir keresinde \u00f6\u011fleden sonram\u0131n b\u00fcy\u00fck bir b\u00f6l\u00fcm\u00fcn\u00fc, asl\u0131nda birinin kapatm\u0131\u015f oldu\u011fu bir yaz\u0131c\u0131dan kaynaklanan "yaz\u0131c\u0131 sorunu"nu ara\u015ft\u0131rmakla ge\u00e7irdim. Bir servisin neden \u00e7al\u0131\u015fmad\u0131\u011f\u0131n\u0131 anlamaya \u00e7al\u0131\u015f\u0131rken izleme panolar\u0131na uzun s\u00fcre bakt\u0131m, oysa ger\u00e7ek cevap yanl\u0131\u015f ortama bak\u0131yor olmamd\u0131. Hi\u00e7 bozulmam\u0131\u015f olan yap\u0131land\u0131rmalar\u0131 yeniden olu\u015fturdum.<\/p>\n

    Hepimiz s\u0131rayla o geli\u015ftirici oluyoruz. Tek de\u011fi\u015fken, bug\u00fcn s\u0131ran\u0131n size gelip gelmeyece\u011fi.<\/p>\n

    \u0130kinci ders: Kimseyi incitmeden "\u0130nternetiniz var m\u0131?" diye sorman\u0131n sanat\u0131<\/h2>\n

    Bu, size kimsenin \u00f6\u011fretmedi\u011fi, destek taraf\u0131nda edinilen bir beceridir ve herhangi bir sertifikadan daha \u00f6nemlidir.<\/p>\n

    "\u0130nternetiniz var m\u0131?" sorusunu yanl\u0131\u015f \u015fekilde sorarsan\u0131z, \u00f6zellikle teknik bilgiye sahip bir kullan\u0131c\u0131 i\u00e7in bu "aptal m\u0131s\u0131n\u0131z?" anlam\u0131na gelir; \u00e7\u00fcnk\u00fc bu, onlar\u0131n yetkinli\u011fine y\u00f6nelik bir meydan okuma olarak alg\u0131lan\u0131r. Sonra savunmaya ge\u00e7erler, ihtiyac\u0131n\u0131zdan daha k\u0131sa bir cevap al\u0131rs\u0131n\u0131z ve art\u0131k bir a\u011f sorununu \u00e7\u00f6zmek yerine bir ili\u015fkiyi \u00e7\u00f6zmeye \u00e7al\u0131\u015f\u0131yorsunuzdur.<\/p>\n

    Benim i\u00e7in i\u015fe yarayanlar:<\/p>\n

      \n
    • Konuyu, olas\u0131l\u0131klar\u0131 elemek \u00fczerine kurun, olas\u0131l\u0131klar\u0131 elemek \u00fczerine de\u011fil.<\/strong> \u201c\u00d6nce s\u0131k\u0131c\u0131 \u015feyleri ortadan kald\u0131ral\u0131m ki sonradan onlarla u\u011fra\u015fmak zorunda kalmayal\u0131m.\u201d \u015eimdi tak\u0131m arkada\u015flar\u0131 olarak bir listedeki maddeleri tek tek i\u015faretliyorsunuz.<\/li>\n
    • Bunu birlikte yap\u0131n, onlara kar\u015f\u0131 de\u011fil.<\/strong> \u201c"Bunu benimle birlikte \u00e7al\u0131\u015ft\u0131r\u0131p ne g\u00f6rd\u00fc\u011f\u00fcn\u00fc s\u00f6yleyebilir misin?" Zekalar\u0131n\u0131 test etmiyorsunuz, veri topluyorsunuz.<\/li>\n
    • Su\u00e7u c\u00f6mert\u00e7e kendin \u00fcstlen.<\/strong> \u201c"\u00d6z\u00fcr dilerim, bunu sormak zorunday\u0131m \u00e7\u00fcnk\u00fc daha \u00f6nce bunu bizzat ka\u00e7\u0131rm\u0131\u015ft\u0131m." Bu, benim durumumda diplomatik bir yalan de\u011fil. Bu bir \u00f6zge\u00e7mi\u015f.<\/li>\n
    • Asla \u201ca\u00e7\u0131k\u00e7as\u0131\u201d veya \u201csadece\u201d demeyin.\u201d<\/strong> Bu iki kelime, herhangi bir g\u00fcvenlik duvar\u0131ndan daha fazla sorun giderme oturumunu sonland\u0131rd\u0131.<\/li>\n<\/ul>\n

      S\u00fcrekli geri d\u00f6nd\u00fc\u011f\u00fcm kural<\/h2>\n

      Her zaman en alttan ba\u015flay\u0131n. Kar\u015f\u0131daki ki\u015fi ne kadar k\u0131demli olursa olsun, ortam ne kadar sofistike olursa olsun, bilet ba\u015fl\u0131\u011f\u0131 sizi do\u011frudan ilgin\u00e7 k\u0131sma atlamaya ne kadar davet ederse etsin.<\/p>\n

      Kablo. Ba\u011flant\u0131. Adres. G\u00fczergah. \u0130sim \u00e7\u00f6z\u00fcmleme. Daha sonra<\/em> uygulama.<\/p>\n

      O katmanlardan a\u015fa\u011f\u0131 inmek doksan saniye s\u00fcr\u00fcyor. Yanl\u0131\u015f tahmin edip asl\u0131nda hi\u00e7 bozuk olmayan \u015feyleri "d\u00fczeltmeye" ba\u015flad\u0131ktan sonra yukar\u0131 \u00e7\u0131kmak ise k\u0131rk be\u015f dakika s\u00fcr\u00fcyor.<\/p>\n

      Ve sekt\u00f6r\u00fcm\u00fcz\u00fcn derin, evrensel \u015fakas\u0131 \u015fu: Yedeklilik, ar\u0131za durumunda devreye girme ve kod olarak altyap\u0131 gibi \u00f6zelliklere sahip, odalarda oturan insanlar taraf\u0131ndan eri\u015filen bu muhte\u015fem da\u011f\u0131t\u0131lm\u0131\u015f bulut sistemlerini kurduk ve bunlar\u0131n her bir par\u00e7as\u0131 hala, hi\u00e7bir duyuru veya \u00f6z\u00fcr dilemeden ara s\u0131ra durmaya karar veren k\u00fc\u00e7\u00fck, yan\u0131p s\u00f6nen bir kutuya dayan\u0131yor.<\/p>\n

      \u00d6nce kutuyu i\u015faretleyin.<\/p>","protected":false},"excerpt":{"rendered":"

      Tamamen uzaktan, tamamen bulut tabanl\u0131 ve tamamen teknik bir \u015firkette \u00e7al\u0131\u015fan k\u0131demli bir yaz\u0131l\u0131mc\u0131 VPN'e ba\u011flanam\u0131yordu. Sorunun, herkesin tahmin etti\u011finden yakla\u015f\u0131k alt\u0131 katman daha a\u015fa\u011f\u0131da oldu\u011fu ortaya \u00e7\u0131kt\u0131.<\/p>","protected":false},"author":1,"featured_media":2107,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[155],"tags":[172,156,173,170,171,169],"class_list":["post-2108","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-war-stories","tag-help-desk-stories","tag-it-support","tag-layer-1","tag-remote-work","tag-troubleshooting-basics","tag-vpn-troubleshooting"],"yoast_head":"\nEveryone Was an Expert. Nobody Checked Layer 1. - Bigs Bili\u015fim Ltd. \u015eti.<\/title>\n<meta name=\"description\" content=\"A VPN ticket from a senior dev at an all-technical remote company. The real fault was at layer 1 \u2014 and it taught me how to ask "do you have internet?" kindly.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.bigsbilisim.com\/tr\/everyone-was-an-expert-nobody-checked-layer-1\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Everyone Was an Expert. Nobody Checked Layer 1.\" \/>\n<meta property=\"og:description\" content=\"A VPN ticket from a senior dev at an all-technical remote company. 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