It seems (correct me if I'm wrong) that there is no really "good" version
of tcpdump/libpcap that can deal with ISDN. There are various patches to
the [03].4a6 version floating around (though [03].4 final has been around
for quite some time), most of them trying to guess packet type by looking
at device names.
Now, I gather that under 2.2, it's quite possible to find out exactly what
type of packet one has. However, I seem to have trouble finding any docs
on this.
So: what interface _should_ a program like this use (given the interface
name as a parameter, show all packets incoming and outgoing, possibly
putting the device into promiscuous mode, possibly using a packet filter)?
And where can I find information on how those packets are encapsulated?
I'd sure like to have a _good_ patch for tcpdump/libpcap.
MfG Kai
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