> does it mean we can capture traffic on loopback device, ie when client and
> server are on same machine?
It means that *if* you can capture on the loopback device, filtering
should work. (He was, I suspect, asking about Linux, where there had
been a problem.)
It says nothing, however, about whether you *can* capture on the
loopback device.
> Is this available on all major OS's,
No.
> specifically is it available in Solaris,
No.
> Linux,
Yes.
> WinNT,
No.
> HPUX?
Not that I've seen.
The *ONLY* OSes I know of that would allow libpcap (or anything else) to
capture on a loopback device are Linux distributions and the BSDs.
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