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64 lines
1.8 KiB
Markdown
64 lines
1.8 KiB
Markdown
## Ethernet setup for 211bsd
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### Basic setup
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The w11a uses an emulated `DEUNA` interface which interacts via a _tap_
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device with the linux host system. The _tap_ device in turn is usually
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connected to an internal _bridge_. This way the w11a can exchange packets
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with the linux host as well as with any other node.
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### Setup of _tap_ and _bridge_
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The _tap_ device should be created such that it is accessible by the
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account under with _ti_w11_ executes. This way only setting up _tap_
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and _bridge_ require root access, but not subsequent usage.
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Two support scripts help in the setup
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```
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ip_create_br
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```
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creates a bridge named _br0_ and re-connects the physical ethernet interface.
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The script works on a PC with a single physical Ethernet interface.
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```
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ip_create_tap [tap-name]
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```
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add a user-mode _tap_ device to the bridge _br0_. If the bridge doesn't exist
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`ip_create_br` is called. If no name is given _tap0_ is used.
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### Used MAC addresses
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The MAC addresses used by w11a are
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```
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52:65:74:72:6f:??
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```
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which are in the range of locally administered MAC addresses. The first
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five bytes mean in ASCII "Retro", easy to pick out in tcpdump -xx traces.
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### Setup in ti_w11
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Is contained in the boot tcl files, just three lines
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```
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cpu0xua set type deuna
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cpu0xua set dpa retro:00
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cpu0xua0 att tap:tap0
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```
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to select DEUNA emulation, the MAC address, and connect to _tap0_.
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### Setup in 211bsd
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The current setup is very simple, expects to live in a 192.168.2.* subnet,
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and does not use DNS, /etc/resolv.conf is empty, uses only /etc/hosts
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```
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127.0.0.1 localhost
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192.168.2.150 w11a
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192.168.2.25 athome
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```
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The parameters in /etc/netstart are
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```
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hostname=w11a
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netmask=255.255.255.0
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broadcast=192.168.2.255
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default=192.168.2.1
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```
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