[ih] when did APRANET -TIPs become known as -TACs

[Bob Hinden]

Jack,

Right, I and someone else (can’t remember his name at the moment), added TCP/IP to the TIP code base to make it the TAC.   I found IEN166 that describes the design.

     https://www.rfc-editor.org/ien/ien166.txt

Was somewhat challenging doing the 32 bit TCP sequence number calculations on the H-316 with 15 bit arithmetic  :-)

From what I remember the TAC name came from AUTODIN II.

Bob


> On Apr 19, 2025, at 2:41 PM, Jack Haverty via Internet-history <internet-history at elists.isoc.org> wrote:
> 
> Signed PGP part
> TACs were TIPs with code added to enable the use of TCP.  That was one of the steps needed before the 1/1/1983 deadline for converting the ARPANET to only support TCP.   So it happened well before then. IIRC, Bob Hinden wrote the TCP code and added it to the TIP, so he may remember more.
> 
> There were some other necessary changes as well.  E.g., the "TIP Login" mechanisms (name/password to connect to a TIP) had to be converted into TACACS (TAC Access Control System).   That may have happened later, in preparation for the split of the ARPANET to adapt it to become part DDN.
> 
> I'm not sure about the -TIP vs -TAC naming.  It may have been just to keep track as individual TIPs were converted into TACs.
> 
> Jack Haverty
> 
> On 4/19/25 14:18, the keyboard of geoff goodfellow via Internet-history wrote:
>> and WHY the dash -TIP to -TAC name change?
>> 
> 
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