Kyauta Mai Ƙididdige Subnet / CIDR

Yadda Yake Aiki

Dukkan lissafi yana gudana gaba ɗaya a burauzarka ta amfani da lissafin bitwise da aka rubuta da hannu — babu ɗakin karatu, babu tafiya-zuwa-uwar garke. Kana shigar da adireshin IPv4 da tsawon prefix na CIDR; kayan aikin yana amfani da ayyukan bit-masking na al'ada kai tsaye a JavaScript don samo kowace dukiyar subnet nan take yayin da kake bugawa.

1. 1
   Nazarin da tabbatarwar shigarwa

   Kayan aikin yana raba adireshin IP na dotted-decimal zuwa octets huɗu, yana tabbatar da kowanne 0–255, kuma yana lulluɓe su zuwa cikakkiyar lamba na 32-bit unsigned ta amfani da ayyukan left-shift. Ana kama adireshin marasa inganci kafin duk wani lissafi ya gudana.
2. 2
   Ginin mask ta bitwise

   Daga tsawon prefix na CIDR, ana gina wani subnet mask na 32-bit ta left-shifting 0xFFFFFFFF da (32 − prefix). Bitwise AND da cikakkiyar lambar IP yana bayar da adireshin network; bitwise OR da mask da aka juya yana bayar da adireshin broadcast. Ana lissafta jimlar adadin host a matsayin 2^(32 − prefix).
3. 3
   Ganowar aji da RFC 1918

   Ana kwatanta octet na farko da ƙimomin iyaka na aji A/B/C/D/E don bayar da aji na IP. Wani bincike daban yana gwada ko adireshin yana faɗuwa a cikin zangon sirri na 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16, ko 127.0.0.0/8 da aka bayyana a RFC 1918.
4. 4
   Rabon subnet da yanayin da za a raba

   Mai rabin subnet yana raba network na yanzu zuwa yaran subnet daidai a zaɓaɓɓen prefix mai tsawo: yana matakai ta hanyar tazara na cikakkiyar lamba na 2^(32 − sabon prefix) daga adireshin asali, yana lissafta network, broadcast, da zangon amfani na kowane yaro nan take. Ana rubuta IP da prefix na yanzu zuwa hash na URL don sakamako su iya zama alama ko a raba su.

Kayan Aiki Masu Alaƙa