Zaɓin nodes mafi kusa a cikin hanyar sadarwa

Lat ɗin hanyar sadarwa yana da tasiri mai mahimmanci akan ayyukan aikace-aikace ko sabis waɗanda ke hulɗa da cibiyar sadarwa. Ƙananan latency, mafi girman aikin. Wannan gaskiya ne ga kowane sabis na cibiyar sadarwa, daga gidan yanar gizo na yau da kullun zuwa bayanan bayanai ko ma'ajin cibiyar sadarwa.

Kyakkyawan misali shine Tsarin Sunan Domain (DNS). DNS ta dabi'a tsarin rarrabawa ne, tare da tushen tushen warwatse ko'ina cikin duniya. Don shiga kowane gidan yanar gizo kawai, kuna buƙatar fara samun adireshin IP ɗin sa.

Ba zan bayyana dukkan tsarin da ake bi ta hanyar "itace" na yankunan yanki ba, amma zan iyakance kaina ga gaskiyar cewa don canza yanki zuwa adireshin IP, muna buƙatar mai ba da shawara na DNS wanda zai yi duk wannan aikin. mu.

Don haka, a ina kuke samun adireshin mai warwarewar DNS?

1. ISP yana ba da adireshin mai warwarewar DNS.
2. Nemo adireshin mai warwarewar jama'a akan Intanet.
3. Dauki naka ko yi amfani da wanda aka gina a cikin na'ura mai ba da hanya tsakanin hanyoyin sadarwa na gida.

Duk waɗannan zaɓuɓɓukan za su ba ku damar jin daɗin hawan igiyar ruwa mara hankali akan Yanar gizo ta Duniya, amma idan kuna buƙatar canza babban adadin yanki zuwa IP, to yakamata ku kusanci zaɓin mai warwarewa a hankali.

Kamar yadda na riga na rubuta, ban da mai warware ISP, akwai adiresoshin jama'a da yawa, alal misali, zaku iya duba wannan jerin. Wasu daga cikinsu na iya zama mafi fifiko saboda suna da ingantacciyar hanyar haɗin yanar gizo fiye da tsoho mai warwarewa.

Lokacin da jerin ya yi ƙanƙanta, zaka iya sauƙin "ping" da hannu kuma ka kwatanta lokutan jinkiri, amma idan har ma ka ɗauki lissafin da aka ambata a sama, to wannan aikin ya zama mara daɗi.

Don haka, don sauƙaƙa wannan aikin, ni, cike da ciwo na impostor, na zana wata hujja ta ra'ayina akan Go da ake kira. matso kusa.

A matsayin misali, ba zan bincika dukkan jerin masu warwarewa ba, amma zan iyakance kaina ga waɗanda suka fi shahara kawai.

$ get-closer ping -f dnsresolver.txt -b=0 --count=10
Closest hosts:
	1.0.0.1 [3.4582ms]
	8.8.8.8 [6.7545ms]
	1.1.1.1 [12.6773ms]
	8.8.4.4 [16.6361ms]
	9.9.9.9 [40.0525ms]

A wani lokaci, lokacin da nake zabar mai warwarewa don kaina, na iyakance kaina don kawai bincika manyan adiresoshin (1.1.1.1, 8.8.8.8, 9.9.9.9) - bayan haka, suna da kyau sosai, kuma menene zaku iya tsammanin daga mummuna madadin adiresoshin.

Amma tunda akwai hanya mai sarrafa kansa don kwatanta jinkiri, me zai hana a faɗaɗa jerin...

Kamar yadda gwajin ya nuna, adireshin "ajiyayyen" Cloudflare ya fi dacewa da ni, tun lokacin da aka shigar da shi a cikin spb-ix, wanda ya fi kusa da ni fiye da msk-ix, wanda ke da kyakkyawar 1.1.1.1 a ciki.

Bambanci, kamar yadda kake gani, yana da mahimmanci, saboda ko da hasken haske mafi sauri ba zai iya isa daga St. Petersburg zuwa Moscow a cikin kasa da 10 ms.

Baya ga ping mai sauƙi, PoC kuma yana da damar kwatanta jinkiri ga sauran ka'idoji, kamar http da tcp, da kuma lokacin canza yanki zuwa IP ta takamaiman mai warwarewa.

Akwai shirye-shiryen kwatanta adadin nodes tsakanin runduna ta amfani da traceroute don sauƙaƙe samun rundunonin da ke da gajeriyar hanya zuwa gare su.

Lambar ba ta da kyau, ba ta da tarin cak, amma tana aiki sosai akan tsaftataccen bayanai. Zan yaba da duk wani ra'ayi, taurari akan github, kuma idan kowa yana son ra'ayin aikin, to, maraba don zama mai ba da gudummawa.

source: www.habr.com