On Jul 1, 5:50pm, Lasevich, Michael wrote:
> I want to know if I can use diald to generate a VPN on demand. I
> want diald to bring up a VPN every time I try to access certain
> networks. (And leave things alone when I try to go to the Internet)
>
> Can this be done?
I looked into doing this a few months ago. It turned out to be harder
than I expected it to be (with diald), so I ended up using the
connect-on-demand feature of pppd for creating an ssh tunnel instead.
As things stand now, I have a perl script which starts a local pppd.
It uses a pty to communicate with the local pppd process. When the
perl script sees data coming over the pty from the pppd process, this
means that it's time to connect to the remote machine via ssh. Once
this connection is made, the remote machine also starts a pppd and
data is relayed between the two machines via the aforementioned perl
script. The local pppd process is responsible for deciding when the
link should be terminated. The perl script detects the EOF condition
on the pty and then terminates the ssh process by closing the pty to
which it is connected.
I really wanted to use diald, but I needed a way of opening a pty from
the diald process in order to glue the pppd process and the ssh
process together. I'm not saying it's impossible, but it did look to
me to be substantially harder than using pppd with the 'demand'
option.
Kevin
--
Kevin Buettner
[EMAIL PROTECTED]
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