From: Lars Weste (lwestegmx.de)
Date: Wed Mar 01 2006 - 07:09:56 CST

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Hi list,

first I was happy to find this upl(4) device.

after connecting it to the usb port, the device shows up as:

upl0 at uhub0 port 2
upl0: Prolific Technology Inc. PL2302 Host-Host Interface, rev 1.00/0.01,
addr 2

I configured it on the first machine:
ifconfig upl0 inet 10.200.200.1 10.200.200.2 netmask 255.255.255.255 up

and on the second host:
ifconfig upl0 inet 10.200.200.2 10.200.200.1 netmask 255.255.255.255 up

ifconfig upl0 on host 1 shows:
upl0: flags=8d1<UP,POINTTOPOINT,RUNNING,NOARP,SIMPLEX> mtu 1024
        inet 10.200.200.1 --> 10.200.200.2 netmask 0xffffffff

ifconfig upl0 on host 2 shows:
upl0: flags=8d1<UP,POINTTOPOINT,RUNNING,NOARP,SIMPLEX> mtu 1024
        inet 10.200.200.2 --> 10.200.200.1 netmask 0xffffffff

I am unable to ping either end of the point-to-point from both hosts.
Also when I try to sniff the connection with tcpdump, then I see the
following error message:
tcpdump -n -i upl0
tcpdump: Failed to open bpf device for upl0: Device not configured

the upl(4) manual page is not that much descriptive about how to use this
interface, it more or less only refers to ifconfig(8)

I think i have missed sth. obvious? Anybody can point me into the right
direction?

greetings
Lars

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