Re: Wireshark packet capture in simulations/emulations (e.g. Mininet)

[Murat Karakus <muratkarakus60 () gmail com>]

Thank you for the explanation. This makes more sense.

Best Regards,
Murat Karakus
On Oct 19, 2015 2:25 AM, "Guy Harris" <guy () alum mit edu> wrote:

> On Oct 18, 2015, at 6:22 PM, Murat Karakus <muratkarakus60 () gmail com>
> wrote:
>
> > As far as I know Wireshark captures real packets sent to/from your
> machine's network cards/interfaces like Ethernet, wireless etc.
>
> Wireshark captures real packets sent over anything on which
> libpcap/WinPcap can capture traffic.
>
> Not everything on which libpcap/WinPcap can capture corresponds to an
> actual hardware network interface.  For example, on UN*Xes, there's a
> network interface called the "loopback" interface, which doesn't correspond
> to any hardware; it has a host on it with the IPv4 address 127.0.0.1, and
> packets sent on it are received by the networking stack on the same
> machine.  That is done purely in software.  On most UN*Xes - Linux, *BSD,
> OS X, Solaris 11 and later, possibly others - libpcap can capture traffic
> on the loopback interface.
>
> > I could not understand how Wireshark can capture packets in a
> simulated/emulated network created such as Mininet. At the end, it is a
> simulation/emulation and no real packet is sent from/to my laptop's network
> cards/interfaces!
>
> Perhaps it's sent on a software interface similar to the loopback
> interface, in which case libpcap can probably capture on it.
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