Re: how to determine port numbering

[rajath kumara <rajathkumara () gmail com>]

Thanks Harris for sucha quick reply.

But , i tried it, its not working that way.

Regarding Ostinato, only winpcap/libpcap functions are called to determine
ports.

what i am worried  is , why is it (port numbering)acting so weird?

On Fri, Jun 10, 2011 at 11:42 AM, Guy Harris <guy () alum mit edu> wrote:

> On Jun 9, 2011, at 10:22 PM, rajath kumara wrote:
>
> > I am working with ostinato for past 1 week, and found it great.
>
> By "ostinato" do you mean
>
>        http://code.google.com/p/ostinato/
>
> ?
>
> > currently i'm facing problems with port numbering, right now i have 6
> > ports( 4 D-link ethernet adapters and 2 Netgear , Ethernet PCI
> > adapter ) . when i connect  cables , ports are getting connected ( im
> > able to transmit, receicve the frames ), but problem is, I'm not able
> > to figure out the way port numbers are assigned.
> >
> > for example , like i mentioned i have 6 ports now, when i connect a
> > cable to last port , port 3 is activated, if i connect cable to 1st
> > port in my system, port 2 gets activated in ostinato.
>
> The page says
>
>        Runs on Windows, Linux, BSD and Mac OS X (Will probably run on other
> platforms also with little or no modification but this hasn't been tested)
>
> libpcap/WinPcap do not have any notion of "port numbers" for network
> adapters.  tcpdump/WinDump do, but all they're doing is getting a list of
> network adapters from libpcap/WinPcap and using ordinal numbers in that
> list.  I don't know whether that's what Ostinato is doing or not.
>
> The list of network adapters libpcap/WinPcap supplies is, except for
> loopback adapters on those platforms where libpcap supports them, in the
> order in which the OS supplies them to libpcap or whatever order the WinPcap
> driver gets them from the OS. (Loopback adapters are sorted to the end of
> the list.)
>
> There is no simple rule to determine the order for the list the OS
> supplies.  This list:
>
>        http://www.iniqua.com/wp-content/uploads/2010/12/ihaveadream.png
>
> is on a Mac OS X machine; the first interface is the built-in Ethernet, the
> second interfaces is the FireWire adapter, the next three are probably
> add-on Ethernets, and the last one is the loopback adapter.  On my Mac, also
> running OS X, the list is en0, fw0, ppp0, utun0, en1, lo0, with the build-in
> Ethernet first, the FireWire adapter second, a PPP adapter for my VPN
> connection to work third, a tunnel interface of some sort fourth, the
> AirPort Wi-Fi adapter fifth, and the loopback adapter last.  If I disconnect
> the VPN, the list changes to en0, fw0, utun0, en1, lo0.-
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