23-OCT-1989 18:28:15.89
    message #2311
    Subject:  ETHERNET-BASED DEVELOPMENT
 
        Have a customer who wants to attact Transputers to a
    busless H.P. workstation via Ethernet. (Seperate memo sent on
    RQ for TCP/IP Beta Site.)

    I understand that this can be used for downloading files to a
    target n/w. 
    Can someone explain to me if the Ethernet-based system is
    intended as a viable system to do s/w development running on Tptr
    board a la iserver in a PC, and which bit of software talks
    to what, e.g. does H.P. run iserver which talks to TCP/IP
    running on H.P. which spits down Ethernet cable,.... etc,.
    Just a brief overview would be appreciated.

    Also can you theoretically have one/multiple workstations
    talking to one/multiple Tptr targets, and if so which bit of
    s/w holds the Ethernet address for the Tptr network that its
    talking to? And how does speed of workstation talking to B407
    on Ethernet compare to PC-B008 or Sun-B014 or Vax-QT0?

    Finally, does anyone know anything enlightening about RARP
    (Reverse Address Resolution Protocol) that they could let me
    know? i.e. what the **** is it.

Subj:	Reply to Catnip #2311

Description:	Re: ethernet development
 
In reply to Catnip #2311 on Ethernet-Based Development.
 
>         Have a customer who wants to attact Transputers to a
>     busless H.P. workstation via Ethernet. (Seperate memo sent on
>     RQ for TCP/IP Beta Site.)
>     I understand that this can be used for downloading files to a
>     target n/w. 
>     Can someone explain to me if the Ethernet-based system is
>     intended as a viable system to do s/w development running on Tptr
>     board a la iserver in a PC, and which bit of software talks
 
Yes.  The UDP software implements iserver "link.c" over ethernet.
 
>     Also can you theoretically have one/multiple workstations
>     talking to one/multiple Tptr targets, and if so which bit of
 
UDP is point to point.
 
> And how does speed of workstation talking to B407 on Ethernet
> compare to PC-B008 or Sun-B014 or Vax-QT0?
 
Figures are not available yet.  I have been told it is similar to S514.
 
>    Finally, does anyone know anything enlightening about RARP
>    (Reverse Address Resolution Protocol) that they could let me
 
On your Sun, try "man rarpd" which yields:
 
NAME
     rarpd - DARPA Reverse Address Resolution Protocol service
 
SYNOPSIS
     /usr/etc/rarpd if hostname
 
AVAILABILITY
     This program is available with the Networking Tools and Pro-
     grams software installation option.  Refer to Installing the
     SunOS for information on how to install optional software.
 
DESCRIPTION
     rarpd starts a daemon that responds to Reverse Address Reso-
     lution  Protocol (Reverse ARP) requests.  The daemon forks a
     copy of itself, and requires root privileges.
 
     The Reverse ARP protocol is used by machines at boot time to
     discover their (32 bit) IP address given their (48 bit) Eth-
     ernet address.  In order for the request to be  answered,  a
     machine's   name-to-IP-address   entry  must  exist  in  the
     /etc/hosts file and its name-to-Ethernet-address entry  must
     exist in the /etc/ethers file.  Furthermore, the server that
     runs the rarpd daemon must have entries in both files.  Note
     that  if  the  server machine is using the Yellow Pages ser-
     vice, the server's files are ignored,  and  the  appropriate
     Yellow Pages maps queried.
 
     The first argument, if, is one of  the  interface  parameter
     strings  (listed in boot(8S)), in the form of ``name unit'',
     for example ie0.  The  second  argument,  hostname,  is  the
     interface's  corresponding host name.  The if, hostname pair
     should be the same as the arguments passed to  the  ifconfig
     (8)  command.   As  with ifconfig, rarpd must be invoked for
     each interface that the server wishes to support.  Therefore
     a  gateway  machine may invoke the rarpd multiple times, for
     example:
 
          /usr/etc/rarpd ie0 host
          /usr/etc/rarpd ie1 host-backbone
 
FILES
     /etc/ethers
     /etc/hosts
 
SEE ALSO
     boot(8S),  ifconfig(8C)  ipallocd(8C),  netconfig(8C),  eth-
     ers(5), hosts(5), policies(5), netconfig(8C), ipallocd(8C)
 
     Finlayson, Ross, Timothy Mann,  Jeffrey  Mogul,  and  Marvin
     Theimer,  A  Reverse  Address  Resolution Protocol, RFC 903,
     Network Information Center, SRI International,  Menlo  Park,
     Calif., June 1984.