3.4 KiB
Ethernet setup for 211bsd
Basic setup
The w11a uses an emulated DEUNA interface which interacts via a tap
device with the Linux host system. The tap device in turn is usually
connected to an internal bridge. This way the w11a can exchange packets
with the Linux host as well as with any other node.
Setup of tap and bridge
The tap device should be created such that it is accessible by the account under with ti_w11 executes. This way only setting up tap and bridge require root access, but not subsequent usage.
Two support scripts help in the set up
ip_create_br
creates a bridge named br0 and re-connects the physical ethernet interface. The script works on a PC with a single physical Ethernet interface.
ip_create_tap [tap-name]
add a user-mode tap device to the bridge br0. If the bridge doesn't exist
ip_create_br is called. If no name is given tap0 is used.
Used MAC addresses
The MAC addresses used by w11a are
52:65:74:72:6f:??
which are in the range of locally administered MAC addresses. The first five bytes mean in ASCII "Retro", easy to pick out in tcpdump -xx traces.
Setup in ti_w11
Is contained in the boot tcl files, just three lines
cpu0xua set type deuna
cpu0xua set dpa retro:00
cpu0xua0 att tap:tap0
to select DEUNA emulation, the MAC address, and connect to tap0.
Setup in 211bsd
The current setup is very simple, expects to live in a 192.168.178.* subnet,
and does not use
DNS,
/etc/resolv.conf is empty, uses only /etc/hosts
127.0.0.1 localhost
192.168.178.150 w11a
192.168.178.20 athome
The parameters in /etc/netstart are
hostname=w11a
netmask=255.255.255.0
broadcast=192.168.178.255
default=192.168.178.1
Usage from 211bsd
Since name resolution is not yet activated and only the backend host
athome is defined in /etc/hosts all other nodes must be specified
by IP-Address, which can be inquired via nslookup
ping athome
PING athome (192.168.178.20): 56 data bytes
64 bytes from 192.168.178.20: icmp_seq=0 ttl=64 time=40 ms
64 bytes from 192.168.178.20: icmp_seq=1 ttl=64 time=20 ms
ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8): 56 data bytes
64 bytes from 8.8.8.8: icmp_seq=0 ttl=56 time=40 ms
64 bytes from 8.8.8.8: icmp_seq=1 ttl=56 time=20 ms
nslookup www.cern.ch 8.8.8.8
Server: google-public-dns-a.google.com
Address: 8.8.8.8
Non-authoritative answer:
Name: webrlb02.cern.ch
Address: 188.184.9.235
Aliases: www.cern.ch
telnet 188.184.9.235 80
Trying...
Connected to 188.184.9.235.
Escape character is '^]'.
GET / HTTP/1.0
HTTP/1.1 302 Found
Content-Type: text/html; charset=utf-8
Location: http://home.web.cern.ch/
Server: Microsoft-IIS/8.5
X-Powered-By: ASP.NET
Date: Thu, 30 May 2019 10:13:27 GMT
Connection: close
Content-Length: 141
<html><head><title>Object moved</title></head><body>
<h2>Object moved to <a href="http://home.web.cern.ch/">here</a>.</h2>
</body></html>
Connection closed by foreign host.
Usage from Linux
Simply use telnet:
telnet 192.168.178.150
Trying 192.168.178.150...
Connected to 192.168.178.150.
Escape character is '^]'.
2.11 BSD UNIX (w11a)
login: root
erase, kill ^U, intr ^C
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