Dynamic Network Addresses

To date I've issued static IP addresses within my small home network.

When I go broadband I will probably use DHCP for address allocation,
how do I check any network connections using PING if I don't actually
know its IP address?

Geoff Lane

> To date I've issued static IP addresses within my small home network.
>
> When I go broadband I will probably use DHCP for address allocation,
> how do I check any network connections using PING if I don't actually
> know its IP address?

I don't really understand what you're asking. I'm presuming you have a LAN
with hosts using private IP addresses, connected to the Internet via a
single IP using NAT.

If your ISP starts using DHCP, this has no effect on the hosts within your
LAN (which have 10.x.x.x or 192.168.x.x addresses)

--
Jem Berkes
http://www.sysdesign.ca/

"Geoff Lane" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> To date I've issued static IP addresses within my small home network.
>
> When I go broadband I will probably use DHCP for address allocation,
> how do I check any network connections using PING if I don't actually
> know its IP address?
>

Well that sounds like a good reason NOT to use DHCP on the home network.

If you really do want to use DHCP, you can

1. assume that if the computer gets an ip address from DHCP, then its got a
network connection.



2. learn to read the current IP address of machines , eg ifconfig on linux,
winipcfg for Windows gui. ipconfig on Windows command prompt.

3. use dynamic dns clients, so that a machine registers itself when it boots

4. there's a microsoft scheme similar to dynamic DNS too.



> Geoff Lane
>

Geoff Lane wrote:
> To date I've issued static IP addresses within my small home network.
>
> When I go broadband I will probably use DHCP for address allocation,
> how do I check any network connections using PING if I don't actually
> know its IP address?
>
> Geoff Lane
>

Set up dhcp to give static ip addresses based on the MAC addresses
of the computers on your network.

Ivor Cave

On Sun, 16 Nov 2003 23:23:03 +0000, Geoff Lane wrote:

> To date I've issued static IP addresses within my small home network.
>
> When I go broadband I will probably use DHCP for address allocation, how
> do I check any network connections using PING if I don't actually know its
> IP address?
>
> Geoff Lane


A good compromise is to issue static addresses to your permanent machines
either manually or by configuring your DHCP server to allocate specific
addresses to their MAC addresses (If your DHCP server will do that). Then
use DHCP to allocate a range on the same subnet for guest computers.
Eg:-

static1 = 192.168.0.1
static2 = 192.168.0.2
static3 = 192.168.0.3

DHCP range = 192.168.0.21 to 192.168.0.100

router = 192.168.0.254

graham

In message <(E-Mail Removed)>, Geoff Lane
<(E-Mail Removed)> writes
>To date I've issued static IP addresses within my small home network.
>
>When I go broadband I will probably use DHCP for address allocation,
>how do I check any network connections using PING if I don't actually
>know its IP address?

I assume that you are going to get a broadband router with a DHCP
server. This can assign dynamic addresses to the machines on your
internal network.

First, there's no real reason why you should use DHCP just because it's
there. You can continue with your existing static addresses on the local
network. What advantage does DHCP offer you?

If you have workstations with dynamic addresses then you need to ping
them by name and not by IP address.


--
Bernard Peek
London, UK. DBA, Manager, Trainer & Author. Will work for money.

Ivor Cave wrote:
> Geoff Lane wrote:
>> To date I've issued static IP addresses within my small home network.
>>
>> When I go broadband I will probably use DHCP for address allocation,
>> how do I check any network connections using PING if I don't actually
>> know its IP address?
>>
>> Geoff Lane
>>
>
> Set up dhcp to give static ip addresses based on the MAC addresses
> of the computers on your network.
>
> Ivor Cave

Not necessary in my experience. Hosts are always assigned the same address..
learn what that address is and remember it - or use dynamic dns registration
and ping by hostname

On Sun, 16 Nov 2003 23:23:03 +0000, in comp.os.linux.networking Geoff Lane <(E-Mail Removed)> wrote:
> To date I've issued static IP addresses within my small home network.
> When I go broadband I will probably use DHCP for address allocation,
> how do I check any network connections using PING if I don't actually
> know its IP address?

Your router will probably have a management interface that you can
query to find the attached IP addresses. The exact interface depends
on the router. My old Netgear RT311 had three: a serial console port,
telnet and a simple webserver.

But there's no need to change to DHCP just because you're getting
broadband.

--
Dale Dellutri <(E-Mail Removed)> (lose the Q's)

On Mon, 17 Nov 2003 15:50:08 +0000, Bernard Peek <(E-Mail Removed)>
wrote:

>>To date I've issued static IP addresses within my small home network.
>>
>>When I go broadband I will probably use DHCP for address allocation,
>>how do I check any network connections using PING if I don't actually
>>know its IP address?

>First, there's no real reason why you should use DHCP
> What advantage does DHCP offer you?

Only that at the moment I am having an extension built and am moving
machines about so am changing which is a server.

Having just typed the last sentence I've just realised that if I have
a router I won't be changing servers so they can keep their static
IPs.

Initially, what prompted me to enquire about DHCP was, I am
experimenting with WiFi and some of my machines have more than one
adapter, which was confusing me.

Geoff Lane

On Mon, 17 Nov 2003 16:33:24 +0000 (UTC), Dale Dellutri
<(E-Mail Removed)> wrote:


>> To date I've issued static IP addresses within my small home network.
>> When I go broadband I will probably use DHCP for address allocation,

>But there's no need to change to DHCP just because you're getting
>broadband.

I appreciate that, I have been confusing myself a wee bit with
changing which computer acts as a server under my present set up.

Geoff Lane