Interesting, if I am correct, they took long time to implement a resolver.  If 
so, how were hostnames resolved?

-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@bama.ua.edu] On Behalf Of 
Bob Shannon
Sent: Tuesday, December 06, 2011 2:07 PM
To: IBM-MAIN@bama.ua.edu
Subject: Re: z/OS's basis for TCP/IP

>I believe that the "TCP/IP for VM" product which was ported to become the 
>"TCP/IP for MVS" >product which became incorporated into the Communications 
>Server product as the IP component >follows what is described as the "Berkeley 
>Software Distribution (BSD" flavour of an >implementation of the Internet 
>Protocol and related protocols such as TCP and UDP and so on. 

However, TCP/IP was re-written for z/OS 1.5. I don't know how much of the 
original port remains.

Bob Shannon
Rocket Software 

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