Re: [opensuse] Can I lock a DHCP ip adress?

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John Meyer wrote:
James Knott wrote:
(Ted Harding) wrote:

On 14-Oct-07 21:42:59, Aniruddha wrote:


On Sun, 2007-10-14 at 14:34 -0700, joe wrote:


Aniruddha wrote:


My brother get his ip adres through DHCP from a large
college lan, his ip changes with regular intervals.
I wonder is it possible reserve one particular ip for
his machine and if so how do I do this?


Sure - are you the admin of the dhcp server?

Joe



Errr, I am afraid not. He just receives his ip adress through dhcp.


There is one thing he could try, which may or may not work often
enough to to be useful.

Say he gets a particular IP address one time. Let him note that,
and configure his own machine to have that IP address statically
configured in his machine (this may involve setting up a static
DNS and gateway too, so it might not be trivial).

<snip>

If it failed at any time, of course, then he'd just have to
revert to DHCP for that connection.



Some networks will refuse connections from a computer that doesn't have
a MAC address that's currently assigned an IP. Also, network admins can
turn into nasty trolls (not that they aren't already <g>) when they find
someone using a static address.



I must have gotten into this thread a little too late. Why, exactly,
would you want a static ip in a dhcp environment? Sorry for the new
question, but it's better than asking people if they prefer "top or
bottom" (not in that way, of course) ;-)


Static assignment of DHCP addresses is often used to identify which
devices are allowed to connect to a network. In an academic institution
it is not unknown for students (or staff for that matter) to use their
machines for purposes that what not entirely appropriate to the normal
business of the institution (Not just "Anyone want to hack the Pentagon
today?" but the use of things like Doom which could have a serious
impact on network performance :-) ). It is often considered rather
important to have a good idea of who owned what so you you know who to
blame when something went wrong:-)

In the institution I used to work all devices were registered with an
appropriate entry in our domain with an appropriate address in our class
B address space. This registration was assigned to an individual (or
department). Anyone who was a member of the institution who was found
doing the above would quite likely face disciplinary action as they
would be violation of the institutions regulations. (The institution
could get quite nasty about this).

As at various times we had individuals accidentally set up machines that
among other things were assigned the external gateway address, and the
addresses of routing kit, so I think you can understand the general
viewpoint on this issue.

With later generation switches one can lock down connections by MAC
address, or monitor which access points were being used which machines
and in theory "alien" machines could be quickly identified and isolated
if required.




- --
==============================================================================
I have always wished that my computer would be as easy to use as my
telephone.
My wish has come true. I no longer know how to use my telephone.

Bjarne Stroustrup
==============================================================================
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