[Simh] Tun/Tap in Mint for RSX-11M Plus 4.6 running in SimH PDP11

[Will Senn]

This question may best be asked elsewhere but I'm struggling to make it 
work with SimH, so here it is :)

tldr; How can I get tun/tap working with Mint 19 and SimH RSX-11M Plus 
4.6 so that I can access the internet from the instance and telnet to it 
from another machine on the network?

Here's the background... I am trying to get RSX-11M Plus 4.6 working in 
SimH with networking on my Mint 19.1 T430 Thinkpad and it's proving 
difficult (both in execution and understanding). I've tried this tap 
stuff before and remember being uber frustrated then, too. But now, I 
know way more about stuff then I did back then.

System: T430 ThinkPad w/16GB Ram, SSD's, 1600x screen.

OS: Linux Mint 19.1 (debian/ubuntu derivative).

Software: SimH built with: make USE_READER_THREAD=1 USE_TAP_NETWORK=1 
USE_INT64=1 vax vax780 pdp11 pdp8

What I'm trying to do: Get my RSX-11M talking to the internet and be 
able to telnet into it, preferably from another laptop on the network.

What I've tried: followed a gist by Upi Temminen for getting it running 
on a pi:

https://gist.github.com/desaster/c49b0f7afa5e061b8f33f159e521b6ee

After installing parprouted, uml-utilities, tunctl, and simh as 
described, did the following:

/etc/sysctl.conf
net.ipv4.conf.all.proxy_arp=1
net.ipv4.ip_forward=1

sudo vi /etc/network/interfaces.d/tap
auto tap-simh0
iface tap-simh0 inet manual
     pre-up tunctl -t tap-simh0 -u simhuser
     up ip link set tap-simh0 up
     up /usr/sbin/parprouted wlp3s0 tap-simh0
     up /sbin/ip link set wlp3s0 promisc on
     post-down ip link set tap-simh0 down
     post-down tunctl -d tap-simh0

auto tap-simh1
iface tap-simh1 inet manual
     pre-up tunctl -t tap-simh1 -u simhuser
     up ip link set tap-simh1 up
     up /usr/sbin/parprouted wlp3s0 tap-simh1
     up /sbin/ip link set wlp3s0 promisc on
     post-down ip link set tap-simh1 down
     post-down tunctl -d tap-simh1

rebooted

used oscar's boot.ini, but with this section for ethernet:

; Ethernet
set xu enable
set xu type=deuna
set xu mac=aa:00:04:00:0c:34
attach xu tap:tap-simh0
sho xu

which resulted in:

PDP-11 simulator V4.0-0 Current        git commit id: b3fa1f9f
Disabling XQ
/opt/pidp11/systems/rsx11mplus/boot.ini-16> attach xu tap:tap-simh0
libpcap version 1.8.1
Eth: opened OS device tap-simh0
XU    address=17774510-17774517, vector=120, BR5, MAC=AA:00:04:00:0C:34
     type=DEUNA, throttle=disabled
     attached to tap:tap-simh0
CPU    11/70, FPP, RH70, autoconfiguration enabled, idle disabled
     4088KB
RQ0: 'PiDP11_DU0.dsk' Contains an ODS1 File system
RQ0: Volume Name:  RSX11MPBL87 Format: DECFILE11A   Sectors In Volume: 
615000
/opt/pidp11/systems/rsx11mplus/boot.ini-35> attach rq1 PiDP11_DU1.dsk
RQ1: creating new file
/opt/pidp11/systems/rsx11mplus/boot.ini-45> attach dz 10001
Listening on port 10001
DZ    address=17760030-17760037*, vector=330-334*, BR5, lines=8
     attached to 10001, 8b, 0 current connections

RSX-11M-PLUS V4.6  BL87   1920.KW  System:"PIDP11"

...snip
 >; INSTALL TCP/IP
 >;
 >SET /NAMED
 >SET /UIC=[1,2]
 >* Load TCP/IP? [Y/N D:Y T:15S]:
 >load if:/vec/high
 >load ip:/vec/high
 >load ud:/vec/high
 >load tc:/vec/high
LOA -- Warning - loadable driver larger than 4K
 >con onl if0:
 >con onl if1:
 >con onl ip:
 >con onl ud:
 >con onl tc:
 >ins lb:[ip]ethacp/fmap=yes
 >ins lb:[ip]ifconfig
 >ins lb:[ip]netstat
 >ins lb:[ip]ping
 >ins lb:[ip]tracert
 >ins lb:[ip]resacp
 >dfl "Frodo"=HOSTNAME/GBL
 >dfl "LOGICAL,DNS,FILE"=RESOLV$ORDER/GBL
 >dfl LB:[1,2]HOSTS.TXT=HOSTS/GBL
 >dfl "LOGICAL,FILE"=RESOLV$ORDER
 >ifc create 256
 >ifc start
Starting IP.
Starting UD.
Starting TC.
 >ifc set if0: dhcp acp ethacp lin UNA-0
 >dfl ",RTR,DNS,DOM"="DHCP$IF0"/gbl
 >;.ifins if0 can if0
 >ins lb:[ip]dhcp
 >run dhcp
 >ifc set if1: add localhost
09:30:21  TCP/IP - ethernet ACP using DECnet DLX
09:30:21  Starting resolver V2.2
 >ifc set if1: sta ope

  DHCP - Failed to find any DHCP servers. Giving up...

which explains why this don't work:
 >
 >PING GOOGLE.COM
Unknown host: GOOGLE.COM

...snip

if I:

ip link show

...

4: tap-simh0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel 
state UP mode DEFAULT group default qlen 1000
     link/ether 22:f2:0d:23:2d:63 brd ff:ff:ff:ff:ff:ff

To my untrained eye, it would appear that tap-simh0 isn't getting an ip 
address :).

Help?!

Thanks,

Will

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