Документ взят из кэша поисковой машины. Адрес оригинального документа : http://mirror.msu.net/pub/rfc-editor/rfc-ed-all/pdfrfc/rfc208.txt.pdf Дата изменения: Wed Mar 27 23:22:21 2002 Дата индексирования: Tue Oct 2 16:20:34 2012 Кодировка:

Network Working Group Request for Comments: 208 NIC: 7181 Categories: B.l, C.2 Updates: none Obsoletes: none

A. McKenzie Bolt Beranek and Newman 9 August 1971

ADDRESS TABLES Attached is a copy of a revision to Appendix A of BBN Report No. 1822; the revised version of the Appendix is our first attempt to make the list of sites attached to the ARPA Network prospective rather than retrospective. We are adopting this approach because of the large number of sites scheduled for attachment in the near future, and because many Hosts apparently require a site's address to be in some local table before their NCPs will permit communication with the site. Therefore, we urge such Hosts to add the new sites to their lists of addresses as soon as possible. Also, please note the address change which will be made at BBN on exactly September first. Incidentally, it seems to us that it is irrational for an NCP discard otherwise valid messages, simply because the sender's doesn't appear in a local table. Similarly, it seems almost irrational for an NCP to prevent a local user from trying to communicate with a remote site, the address of which is known user but not stored in the NCP's tables. to address as to the

McKenzie

[Page 1]


RFC 208

Address Tables

9 August 1971

Report No. 1822 APPENDIX A IMP AND HOST SITE IDENTIFICATION

Bolt Beranek and Newman Inc.

Bit 9-16 of the leader of most Host-to-IMP or IMP-to-Host messages define a network address related to the message (these bits are not meaningful for message types 1, 2, and 4). In a Host-to-IMP message the network address identifies a particular Host to which the message should be delivered. In an IMP-to-Host message the network address identifies the Host from which the message originated. A network address consists of six bits (bits 11-16 of the leader) which specify an IMP number, preceded by two bits (bits 9-10 of the leader) which 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 each Host currently connected to the ARPA Network or scheduled for connection in the near future. Scheduled installation dates are also shown for Hosts not currently connected; these dates, however, are subject to change without notice. IMP NUMBER -----1 2 3 4 5 SITE NAME ---UCLA SRI UCSB UTAH BBN HOST NUMBER -----0 1 0 1 0 0 0 1 2 NETWORK ADDRESS ------1 65 2 66 3 4 5) 69 ) 133 SCHEDULED INSTALLATION ------------

HOST ---SIGMA-7 IBM 360/91 PDP-10 (NIC) PDP-10 (Al) IBM 360/75 PDP-lO DDP-516 PDP-10 (A) PDP-1O (B)

See Note 1

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.

McKenzie

[Page 2]


RFC 208

Address Tables

9 August 1971

IMP NUMBER -----6 7 8 9

SITE NAME ---MIT

10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 30

HOST NUMBER -----0 1 RAND O 1 SDC O HARVARD O 1 2 LINCOLN O 1 STANFORD O ILLINOIS O CASE O CARNEGIE O PAOLI O NASA/AMES O 2 MITRE 2 RADC O 2 NBS O ETAC 2 TINKER O McCLELLAN O USC 0 2 GWC 2 NCAR O 2 BBN/TIP 2

HOST ---Honeywell 645 PDP-10 360/65 PDP-1O IBM 360/75 PDP-1O PDP-1 PDP-11 IBM 360/67 TX2 PDP-1O PDP-11 PDP-1O PDP-1O B6500 IBM 360/67 TIP TIP H 635/645 TIP PDP-11 TIP 418 III 418 III IBM 360/44 TIP TIP CDC 7600 TIP TIP

NETWORK ADDRESS ------6 70 7 71 8 9 73 137 10 74 11 12 13 14 15 16 144 145 18 146 19 148 21 22 23 151 152 25 153 158

SCHEDULE INSTALLATION ------------

8/3/71 8/31/71 10/5/71 11/2/71 11/30/71 1/4/71 2/1/72 2/29/72 3/14/72 3/28/72

McKenzie

[Page 3]