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65 lines
2.3 KiB
Markdown
65 lines
2.3 KiB
Markdown
## Using SLIP (Serial-line-IP) with 211bsd
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### Basic setup
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[SLIP](https://en.wikipedia.org/wiki/Serial_Line_Internet_Protocol) provides
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a point-to-point IP connection between two nodes via a serial line.
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On the w11a side a DL11 line or a DZ11 line is connected with a
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`slattach` command to a free `sl` device unit.
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On the host side the serial line is attached to a
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[pty](https://en.wikipedia.org/wiki/Pseudoterminal) which is in turn
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connected with a `slattach` command to the Linux host network stack.
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The current setup assumes
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- w11 and host located on subnet 192.168.178.*
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- w11 system has IP address 192.168.178.150
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- host system has IP address 192.168.178.20
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### Setup in 211bsd
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In the [211bsd_rp](../211bsd_rp/README.md) system the last DZ11 line
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`/dev/tty07` is already setup at startup time via the
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` /etc/netstart` lines
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```
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ifconfig sl0 inet 192.168.178.150 192.168.178.20 -arp -trailers ...
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slattach /dev/tty07 9600
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```
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The setup can be verified with a `netstat` command
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```
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netstat -I
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Name Mtu Network Address Ipkts Ierrs Opkts Oerrs Coll
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sl0 1006 192.168.178 192.168.178.150 0 0 0 0 0
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lo0 1536 localnet 127.0.0.1 4600 0 4600 0 0
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```
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### Setup in ti_w11
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To attach the last DZ11 line `cpu0dza7` to a pty use
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```
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cpu0dza7 att pty:
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cpu0dza7 set to7bit 0
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cpu0dza7 get channelid
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```
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The last command returns the Linux pty device name in the form `/dev/pts/nn`.
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### Setup in Linux
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To connect the pty to the Linux host network stack use
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```
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sudo slattach -d -v -p slip /dev/pts/<unit>
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sudo ifconfig sl0 192.168.178.20 pointopoint 192.168.178.150 up
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```
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where `<unit>` is the pty unit number return by `cpu0dza7 get channelid`.
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The setup can be verified with a `route` command
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```
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route
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Kernel IP routing table
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Destination Gateway Genmask Flags Metric Ref Use Iface
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default fritz.box 0.0.0.0 UG 0 0 0 br0
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192.168.2.150 * 255.255.255.255 UH 0 0 0 sl0
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192.168.178.0 * 255.255.255.0 U 0 0 0 br0
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```
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### Usage
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The setup is currently very minimalistic, no name resolution, no routing.
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Simplest way to use the SLIP connection is to `telnet` from the host system
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to the 211bsd system with
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```
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telnet 192.168.178.150
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```
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