Hi All
I've been trying to figure out how to send an ARP-Request request
since long, but im stumped. Somebody told me that you have to use
RAW-Sockets for that,  but how, and this "How" is beyond my
comprehension. Moreover, i have also seen RAW FAQ's and that is not
very helpful either. I mean i know how to create an ARP-Request Header
and Ethernet Header using structs , and how to avoid byte padding by
assigning these structs to U_char arrays, but this Raw-socket usage in
terms of sending ARP-Request is beyond my comprehension. Would you
please tell me how to send an ARP-Request-broadcast over a LAN( so
that every node attached to my LAN must receive this arp-request) by
using RAW-Sockets?????..please answer this question, any
pointers/comments/guidelines will be highly
appreciated..........................

I was just going through TCP/IP illustrated vol 2. Section 21.5 Page
683, and i found a "arpwhohas()" function that takes two parameters
namely:
struct arpcom *ac;//&
struct in_addr *addr;

furthermore, i found that arpwhohas() function , in turn, calls
arprequest() function. So my question is can we send an ARP-Request on
Ethernet by directly calling this arpwhohas() function , by just
providing the required arguments? if so, then how????
and if we can't send ARP-Request by calling above , why can't??
i will be more than glad if you take some time off and give me some
invaluable suggestions out of your valuable time.
Thanking in anticipation.
Regards
Waqas

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ANaiveProgrammer wrote:
>
> Hi All
> I've been trying to figure out how to send an ARP-Request request
> since long, but im stumped. Somebody told me that you have to use
> RAW-Sockets for that,  but how, and this "How" is beyond my
> comprehension.

You could take a look at the source code for arping.

> So my question is can we send an ARP-Request on
> Ethernet by directly calling this arpwhohas() function , by just
> providing the required arguments?

Never heard about it.

--
Kasper Dupont

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