RFC 208

Address Tables ✨

okay bestie, let's get into it 🎀 this is RFC 208, written by A. McKenzie at Bolt Beranek and Newman and dated 9 August 1971. it's NIC 7181 and filed under categories B.l and C.2 💖 it updates none and obsoletes none, so it's a brand new doc, not replacing anything 🌸

Network Working Group, Request for Comments 208. the whole vibe is ARPA Network address lists, so let's go 🦋

Attached is a copy of a revision to Appendix A of BBN Report No. 1822 💅 the big idea is that this revised version is our first try at making the list of sites attached to the ARPA Network prospective instead of retrospective ✨ why? because so many sites are scheduled to hook up super soon, and lowkey a lot of Hosts need a site's address sitting in some local table before their NCPs will even let them talk to that site 😭 so we're urging those Hosts to add the new sites to their address lists asap 🫶 also, mark your calendars: the address change at BBN happens on exactly September first 🍓

okay and here's the spicy take 🌶️ it's irrational for an NCP to toss out perfectly valid messages just because the sender's address isn't in a local table 💀 and it's almost as irrational for an NCP to stop a local user from trying to reach a remote site when the user knows the address but it isn't stored in the NCP's tables 🙈 not me being like, why is this even a thing?? 😤

Report No. 1822 Bolt Beranek and Newman Inc.

Appendix A: IMP and Host Site Identification 🧚

bestie, this part is the actual map 🗺️💜 bits 9-16 of the leader in most Host-to-IMP or IMP-to-Host messages define a network address tied to that message 👑 (these bits aren't meaningful for message types 1, 2, and 4). in a Host-to-IMP message, the address names the particular Host the message should be delivered to ✨ in an IMP-to-Host message, it names the Host the message came from 🎀

so a network address is made of six bits (bits 11-16 of the leader) that specify an IMP number, plus two bits in front of them (bits 9-10 of the leader) that specify the Host number of a particular Host connected to that IMP 🌈 the table below gives the decimal values of IMP number, Host number, and network address for every Host currently connected to the ARPA Network or scheduled to connect soon 🦋 for Hosts that aren't connected yet, scheduled installation dates are shown too, but ngl those dates are subject to change without notice 😬

 IMP      SITE     HOST                    NETWORK    SCHEDULED
NUMBER    NAME    NUMBER       HOST        ADDRESS   INSTALLATION
------    ----    ------       ----        -------   ------------
  1       UCLA      0       SIGMA-7           1
                    1       IBM 360/91       65
  2       SRI       0       PDP-10 (NIC)      2
                    1       PDP-10 (Al)      66
  3       UCSB      0       IBM 360/75        3
  4       UTAH      0       PDP-lO            4
  5       BBN       0       DDP-516           5  )   See Note 1
                    1       PDP-10 (A)       69  )
                    2       PDP-1O (B)      133

Note 1: Prior to September 1, 1971 the BBN PDP-1O (A) will be Host number 0 (network address 5) and the BBN DDP-516 will be Host number 1 (network address 69). The address change is to be made during the day on 9/1/71. ⏰✨

okay, the second batch of sites 🌸 same vibe, just more sites being added to the list 💅

 IMP       SITE       HOST                      NETWORK     SCHEDULE
NUMBER     NAME      NUMBER      HOST           ADDRESS   INSTALLATION
------     ----      ------      ----           -------   ------------
  6        MIT          0       Honeywell 645        6
                        1       PDP-10              70
  7        RAND         O       360/65               7
                        1       PDP-1O              71
  8        SDC          O       IBM 360/75           8
  9        HARVARD      O       PDP-1O               9
                        1       PDP-1               73
                        2       PDP-11             137
 10        LINCOLN      O       IBM 360/67          10
                        1       TX2                 74
 11        STANFORD     O       PDP-1O              11
 12        ILLINOIS     O       PDP-11              12
 13        CASE         O       PDP-1O              13
 14        CARNEGIE     O       PDP-1O              14
 15        PAOLI        O       B6500               15
 16        NASA/AMES    O       IBM 360/67          16      8/3/71
                        2       TIP                144
 17        MITRE        2       TIP                145      8/31/71
 18        RADC         O       H 635/645           18      10/5/71
                        2       TIP                146
 19        NBS          O       PDP-11              19      11/2/71
 20        ETAC         2       TIP                148      11/30/71
 21        TINKER       O       418 III             21      1/4/71
 22        McCLELLAN    O       418 III             22      2/1/72
 23        USC          0       IBM 360/44          23      2/29/72
                        2       TIP                151
 24        GWC          2       TIP                152      3/14/72
 25        NCAR         O       CDC 7600            25      3/28/72
                        2       TIP                153
 30        BBN/TIP      2       TIP                158

Report No. 1822 is the source of all this, and this revised Appendix is the updated, prospective version 🦋💖 if you're building one of these address tables, the sites above are the ones to add 🫶 and yes, that's the whole doc, no cap 🎀

stay iconic, bestie 💜👑