> I am trying to use Ethereal with a modem connection
I assume by "modem connection" you're referring to a PPP link, over a
dial-up line, to, for example, an ISP.
(If it's *not* a PPP or SLIP connection, or some other type of
connection that your OS recognizes as a network device, Ethereal doesn't
support capturing on it.)
> and every time I try to capture the connection goes down.
Are you, when doing the capture on that PPP connection, specifying the
name of the network interface for that connection as the device on which
to capture?
If so, what happens if you use tcpdump (if you're using Windows, you can
get a Win32 port of tcpdump from
http://netgroup-serv.polito.it/windump/
) instead of Ethereal?
If the same problem occurs there (which I suspect it would, as Ethereal
and tcpdump use the same mechanism for connecting to a network device
and capturing from it), you might tell the supplier of whatever OS
you're using that, when you try to capture packets on the PPP link, the
connection goes down, and ask them how that bug in the OS can be fixed.
