On linux you can have multiple IPs per physical device. You can create a virtual Ethernet interface on eth0 with ifconfig eth0:1 10.1.1.1 netmask 255.255.255.0, for example. You can sometimes set the hardware address with ifconfig, too, but it depends on whether or not your driver allows the SIOCSIFHWADDR ioctl. Or you can use the ioctl in perl like this (untested): 
require "ioctl.ph";
use Fcntl;
...
sysopen ETHER, "/dev/your-ethernet-device", O_RDONLY;
# You'll need to pack the address into $addr.
ioctl ETHER, &SIOCSIFHWADDR, $addr;

[download]
You might check out libnet which is a tool for building packets. You could probably build the xs files. The libnet on CPAN is not the same thing. You could also try some hacker sites as they use such techniques for attacking systems...

W2k lets you set multiple IP addresses on an interface, too, but I don't know how to refer to them in a program. HTH, --traveler

In reply to Re: How can I simulate multiple IP/MAC combinations on one computer? by traveler
in thread How can I simulate multiple IP/MAC combinations on one computer? by apprentice

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.