> 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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