Re: Static vs. Dynamic IP

Nick Leverton <nick@xxxxxxxxxxxx> wrote:

Hi Stu,

Hi Nick! How are the kids?

Yes they can, and yes it is. Most routers will hand out dynamic
addresses to any local computers which aren't configured with
static ones. But to confuse things further you can program the
router so that it hands out a fixed address to particular
computers, giving the illusion of static addresses.

That makes sense. I know there are some advantages of a static
address - the only one I can think of is that you can run a website
from the machine connected to one, if I recall correctly. Are there
others?

Actually the IP address is
assigned to a particular plug, and as long as I plug my computer
into it, it will work.

It's possible to restrict networks like this but IME it would be
rare. Only specialist networking kit tends to have the facility to
restrict IPs to physical ports, general purpose home/SOHO routers
don't.

The reason I said that is that apparently all the static IP addresses
are now in use. I unplugged one of the computers already hooked up
to one and plugged it into my laptop. And I was able to connect
without trouble.

Actually he called his a bridge. I'm not at all familiar with
that. But I don't think it really matters much if I can connect
my two computers to my own router.

A hub connects a number of physical cables together into a network
segment. It (generally) forwards everything from any port onto
all of the other ports and performs no filtering or translation.

A bridge connects two network segments and forwards everything
between them, performing any necessary translations. You'd use it
to connect two office networks or parts of networks as if they
were one.

Thanks. That makes sense in concept. But why would he say that it's
the bridge that allows his laptop to connect wirelessly to the
system? Sounds to me like it's connected by static IP as well,
whether on the local or ISP level I don't know.

But if you are being bridged in the office it will be to another
(fixed or wireless) network device, to which the internet router
is then probably attached.

Perhaps it's a bridge between the fixed and the wireless networks.
But why they would set it up that way eludes me.

You can even plug your own masquerading router into his bridge and
it ought to work, though you'd probably need to program it on its
external side with whatever static address, nameserver and gateway
details he gave you for his local network.

That's a little beyond me and actually makes me a little dizzy to
read. I'll see what I can do with the router I've got.

Thanks again! I really appreciate all the help and information.

Stu
.

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