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Štirideset let RFC-jev

Štirideset let RFC-jev

The New York Times - Praktično ne bi smelo biti računalnikarja, ki ne bi vsaj slišal, če že ne dobro poznal RFC-jev. Z njimi je internet oz. njegovi predhodniki standardiziran in reguliran (nekateri RFC-ji sicer zgolj opisujejo najboljšo trenutno prakso ali pa so povsem eksperimentalne narave), tako da se lahko med seboj razumemo.

Pred točno štiridesetimi leti je bil določen prvi RFC-1 Host Software (RFC mimogrede pomeni Request for Comment), ki je standardiziral primitivno omrežje, ki je povezovalo štiri računalnike na štirih ameriških univerzah v Los Angelesu, Stanfordu, Santa Barbari in Salt Lake Cityju, poroča The New York Times. Od tedaj zaporedno številčeni RFC-ji urejajo delovanje domala vseh omrežij, trenutno pa smo prilezli že prek številke RFC5000. Vsakokrat, ko se nek standard spremeni, je izdan nov RFC z novo številko, medtem ko se stari označi kot zastarel, nikoli pa se ne spremeni.

7 komentarjev

Tero ::

Meni je najbolj zanimiv RFC1149 :D
Give a man a fish, he'll be fed for a day.
Teach a man to fish and he'll drown himself.

McAjvar ::

Zelo informativen je tudi RFC1925.
"[...] the advance of civilization is nothing
but an exercise in the limiting of privacy."
- Isaac Asimov

jype ::

3251 je tudi super.

lymph ::

Meni je najbolj zanimiv RFC1149 :D


The IP datagram is printed, on a small scroll of paper, in
hexadecimal, with each octet separated by whitestuff and blackstuff.
The scroll of paper is wrapped around one leg of the avian carrier.
A band of duct tape is used to secure the datagram's edges. The
bandwidth is limited to the leg length. The MTU is variable, and
paradoxically, generally increases with increased carrier age. A
typical MTU is 256 milligrams. Some datagram padding may be needed.

Upon receipt, the duct tape is removed and the paper copy of the
datagram is optically scanned into a electronically transmittable
form.
"Belief is immune to counter example."

Tero ::

Drugač RFC 1149 je bil v resnici testiran :)




On 28 April 2001, IPoAC was actually implemented by the Bergen Linux user group.[1] They sent nine packets over a distance of approximately five kilometers (three miles), each carried by an individual pigeon and containing one ping (ICMP Echo Request), and received four responses.

Script started on Sat Apr 28 11:24:09 2001
vegard@gyversalen:~$ /sbin/ifconfig tun0
tun0 Link encap:Point-to-Point Protocol
inet addr:10.0.3.2 P-t-P:10.0.3.1 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:150 Metric:1
RX packets:1 errors:0 dropped:0 overruns:0 frame:0
TX packets:2 errors:0 dropped:0 overruns:0 carrier:0
collisions:0
RX bytes:88 (88.0 b) TX bytes:168 (168.0 b)

vegard@gyversalen:~$ ping -i 900 10.0.3.1
PING 10.0.3.1 (10.0.3.1): 56 data bytes
64 bytes from 10.0.3.1: icmp_seq=0 ttl=255 time=6165731.1 ms
64 bytes from 10.0.3.1: icmp_seq=4 ttl=255 time=3211900.8 ms
64 bytes from 10.0.3.1: icmp_seq=2 ttl=255 time=5124922.8 ms
64 bytes from 10.0.3.1: icmp_seq=1 ttl=255 time=6388671.9 ms

--- 10.0.3.1 ping statistics ---
9 packets transmitted, 4 packets received, 55% packet loss
round-trip min/avg/max = 3211900.8/5222806.6/6388671.9 ms
vegard@gyversalen:~$ exit

Script done on Sat Apr 28 14:14:28 2001
Give a man a fish, he'll be fed for a day.
Teach a man to fish and he'll drown himself.

Zgodovina sprememb…

  • spremenil: Tero ()

Wirko ::

1149 je skrajno resno branje. Kakšen laik težko zastopi, kaj so plasti v omrežni arhitekturi in kako to, da je izvedba vsake neodvisna od izvedbe drugih. Golobi tle pomagajo.

Se pa ne morem odločit, kaj bi bila tukaj po OSI modelu prva plast in kaj druga.
[:4{#]

[D]emon ::

Mnja ... predstavljaj si packet loss ko bi razgrajala kaka pticja gripa :D


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