Re: regarding arp and rarp

["Richard Hansen" <pcap-ri () scientician org>]

Guy Harris <guy () alum mit edu> wrote:
> On Jun 26, 2006, at 12:03 PM, lalani () cs fsu edu wrote:
>
> >  I am trying to disect ARP/RARP packet.
> >  Basically I am looking for this information: Operation code,
> > Sender HW address, Sender Protocol address, Destination HW address
> > and Destination Protocol address.
> >  Is there a direct way using pcap to get that information.
>
> You can use libpcap to get the raw contents of packets,
> including ARP/
> RARP packets.
>
> You can't use libpcap to dissect ARP/RARP packets - or any
> other type
> of packets; it doesn't include any code to dissect packets.  You
> either have to write your own code to dissect them, or use some
> existing code to dissect them (for example, you could copy the code
> in tcpdump and modify it as necessary).

Although I haven't tried it out, libnet (http://www.packetfactory.net/libnet/) looks like it can dissect ARP (along 
with a bunch of other protocols).

Hope this helps,
Richard


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