It is currently Fri, 18 Jan 2019 00:32:18 GMT

Author Message
 same ip, different subnet mask.
a question: is possible to have two host with the same IP and different

Someone said me it works in practice, but not in theory. Is it right?

Tank you very much!

 Sat, 22 Aug 2009 06:45:23 GMT   
 same ip, different subnet mask.
On Mar 5, 2:45 pm, slystoner <> wrote:

You can certainly do it. Whether or not it will work depends upon what
you need to happen.

It depends what you mean by "works". Something will certainly happen,
and if that's what you wanted, then it worked. If not, then not.


 Sat, 22 Aug 2009 06:48:00 GMT   
 same ip, different subnet mask.
On 03/06/2007 04:15 AM, slystoner wrote:

IMHO, the IP, most of other such protocols and basically computers are
based on discrete integer mathematics. Hence, the theory and practice
should be one and the same anyway.

Moreover, I don't find any reason to assign same IP address to more than
one machine live on a LAN. If I'm not wrong all subnets are somehow part
of a net and, or supernet, though these may be on different LAN segments.

BTW, Is it possible you and, or that someone will let us know what you
are trying to accomplish?

Dr Balwinder S "bsd" Dheeman          Registered Linux User: #229709
Anu'z Linux@HOME                      Machines: #168573, 170593, 259192
Chandigarh, UT, 160062, India         Gentoo, Fedora, Knoppix/FreeBSD/XP
Home:  Visit:

 Sat, 22 Aug 2009 10:48:44 GMT   
 same ip, different subnet mask.
On Mon, 05 Mar 2007, in the Usenet newsgroup comp.os.linux.networking, in

Is it "possible"?    Sure.   Practical?   Probably not. Why not try it
yourself and see?

Depends on the IP stack, and how the network is _otherwise_ configured.
You _could_ set the network to not use ARP, and things might then sorta
work maybe, depending on how the static ARP entries on every system on
the local segment were configured.  But otherwise you are going to have
problems.  ARP doesn't have network mask values, and merely asks who
owns an address. With two hosts having the same IP, both would reply.
See RFC0826 for details - it's not that big of a document:

  0826 Ethernet Address Resolution Protocol: Or converting network
       protocol addresses to 48.bit Ethernet address for transmission on
       Ethernet hardware. David C. Plummer. November 1982. (Format:
       TXT=21556 bytes) (Also STD0037) (Status: STANDARD)

Certainly a different question, I must admit.

        Old guy

 Sun, 23 Aug 2009 03:58:12 GMT   
   [ 4 post ] 

Similar Threads

1. multiinterface belong to same classic IP network with different subnet mask


3. adding a route with a different subnet mask

4. IP alias with wrong subnet mask in rh5.1

5. IP and subnet mask not from the same class

6. Dual IP Single Machine, Subnet mask??

7. IP Subnet masks, subnetting class C net.

8. IP Subnet masks, subnetting class C net.

9. changing IP,Subnet MASK address and GATEWAYaddress

10. Need to sepecify subnet mask with IP routes

Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group.
Designed by ST Software