Ethernet packet driver emulator.
This driver emulates an Ethernet packet driver on one side, and is a
PC/FlexNet application on the other side. It enables standard TCP/IP applications
such as NCSA Telnet to be used over radio. The driver emulates Ethernet-ARP
and supports AX25-ARP.
First, PC/FlexNet and its L1 drivers must be installed and started.
Then, ETHEREMU may be loaded. ETHEREMU needs the callsign
and SSID that should be used for TCP/IP, and the interrupt number where
it should install the packet driver interface. The interrupt must not be
used already by another program! The callsign and SSID must not be used
by another PC/FlexNet application on the same PC/FlexNet AX25 stack.
Example: ETHEREMU -i=0x70 -m=HB9JNX-11
Now the paths to the routers must be configured. This can be done with
EEMUCFG. There may be 16 paths (at this time).
An example: We want to enter the path to HB9W-11, which can be found
over HB9W and has the IP address 44.142.52.6. All amateur ip addresses
(44.x.x.x) shall be routed to HB9W-11.
EEMUCFG add vc 44.142.52.6/0xff000000 HB9W-11 HB9W
The vc tells ETHEREMU to use virtual circuits, i.e.
it connects first to the router before it sends data. This is the recommended
setting. The alternative would be dg. In this case ETHEREMU uses
Unnumbered Info (UI) frames. The hexadecimal number after the slash ("/")
specifies the netmask. Only those address bits whose corresponding bit
in the netmask is one are compared. For convenience the configuration should
be done with a batch file, since ETHEREMU does not remember the
configuration.
EEMUCFG and EEMUCFG STAT shows the table of the paths.
The proper IP address cannot be set directly. It is needed for AX25 ARP
replies and it is set the first time the IP application sends an Ethernet-ARP
request. This IP address is thus taken from the IP application.
EMUCFG STAT shows the time the table entry was last used and
it shows the round trip time of the route (Frack, in 100ms units). A "--"
means that it is either a "datagram" path or that there is currently
no circuit. Curcuits are disconnected if they are not used for 15 minutes.
