On Tue, 23 Jan 2001, Guy Harris wrote:

> >    Is it possible to capture loopback traffic (
> > packets adressed to same machine) on a tru64 alpha
> > machine using tcpdump? I tried to capture (device lo0)
> > but see nothing.
> 
> I tried that with the tcpdump that comes with Digital UNIX 4.0F, and it
> failed to capture anything when I did a "ping 127.0.0.1" on the same
> machine.

On Digital Unix 4.0E, this works fine for me with tcpdump 3.4/libpcap 0.4.
By default interfaces are not set to capture traffic "sent/received by the
kernel-resident protocol software [for example, IP, ARP, DECnet, LAT] on
this host" (from pfconfig manpage). Are you sure to have set
"copy-all" mode of your loopback interface via the pfconfig +copyall lo0
command ?

Simon

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