There is absolutely TCP/IP in Ultrix-11. This is an emulated 11/23+:

--
hrb11# uname -a
ULTRIX-11 hrb11 3 0 PDP-11/23
hrb11# ifconfig qe0
qe0: 192.168.1.199 netmask ffffff00 flags=263<UP,BROADCAST,NOTRAILERS,RUNNING>
broadcast: 192.168.1.255
hrb11# netstat -rn
Routing tables
Destination     Gateway         Flags    Refcnt Use        Interface
74.42.148.138   192.168.1.1     UGH      0      0          qe0
192.168.1       192.168.1.199   U        1      0          qe0
default         192.168.1.1     UG       0      0          qe0
192.168.5       192.168.1.1     UG       0      0          qe0
hrb11# ftp 192.168.1.63
Connected to 192.168.1.63.
220 aelfric FTP server (Version 6.4/OpenBSD/Linux-ftpd-0.17) ready.
Name (192.168.1.63:root):
...
--

It has trouble talking to the outside world, probably not a big surprise, but works just fine on my local network. I am working on getting it installed in a real 11/23 but the Ultrix RL02 driver doesn't seem to like my Dilog emulation board.

-Henry

On 20 May 2017 at 06:46, Johnny Billquist <bqt@update.uu.se> wrote:

On 2017-05-20 04:00, Warner Losh <imp@bsdimp.com> wrote:

https://ia601901.us.archive.org/10/items/bitsavers_decpdp11ulLTRIX112.0SPDSep84_870730/AE-X370C-TC_ULTRIX-11_2.0SPD_Sep84.pdf

Looks like it requires MMU, but not split I/D space as it lists the
following as compatible: M11, 11/23+, 11/24, 11/34, 11/40 and 11/60. It
does require 256kb of memory. See table 2, page 6 for details.

Uh...? Where do you see that there is any TCP/IP support in Ultrix-11? If any was done by someone else, there is no saying that it would be usable on a machine without split I/D. To be honest, I've never seen any mention of TCP/IP on any machine without split I/D space. I guess it could be done, but it would be a rather big headache...

Johnny

--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt@softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol