Using DHCP but assign a manual address?

My wifi router uses DHCP, but I want to assign one of my windows XP
machines a manual IP that remains the same.

In mac os x, to do this I go onto TCP/IP prefs and choose 'DHCP with
manual address' enter my IP, subnet mask and gateway address and then I
leave the DNS fields blank as my router gets them automatically.

When I try the same thing in XP in TCP/IP properties for my wifi
connection, my PC gets the IP alrght but I lose my internet connection
and can only get it back if I revert to getting my IP automatically.

Any help please?

On Fri, 26 Jan 2007 23:03:03 +0000, Mark <(E-Mail Removed)> wrote in
<45ba8931$0$8724$(E-Mail Removed)>:

>My wifi router uses DHCP, but I want to assign one of my windows XP
>machines a manual IP that remains the same.
>
>In mac os x, to do this I go onto TCP/IP prefs and choose 'DHCP with
>manual address' enter my IP, subnet mask and gateway address and then I
>leave the DNS fields blank as my router gets them automatically.
>
>When I try the same thing in XP in TCP/IP properties for my wifi
>connection, my PC gets the IP alrght but I lose my internet connection
>and can only get it back if I revert to getting my IP automatically.
>
>Any help please?

Some routers have a way to define fixed DHCP addresses for particular
MAC addresses -- that's the best way. Otherwise, you need to be sure:
(1) that your manual IP address is in the correct subnet
(2) that the subnet mask is correct
(3) that you've manually set the correct DNS server(s)
(4) that you've manually set the correct gateway address
The best way to do all that is to go back to DHCP assignment; see what
the router assigns; then make those settings manually; and configure the
router not to hand out that IP address to a DHCP client.

--
Best regards, FAQ for Wireless Internet: <http://Wireless.wikia.com>
John Navas FAQ for Wi-Fi: <http://wireless.wikia.com/wiki/Wi-Fi>
Wi-Fi How To: <http://wireless.wikia.com/wiki/Wi-Fi_HowTo>
Fixes to Wi-Fi Problems: <http://wireless.wikia.com/wiki/Wi-Fi_Fixes>

John Navas wrote:
> On Fri, 26 Jan 2007 23:03:03 +0000, Mark <(E-Mail Removed)> wrote in
> <45ba8931$0$8724$(E-Mail Removed)>:
>
>> My wifi router uses DHCP, but I want to assign one of my windows XP
>> machines a manual IP that remains the same.
>>
>> In mac os x, to do this I go onto TCP/IP prefs and choose 'DHCP with
>> manual address' enter my IP, subnet mask and gateway address and then I
>> leave the DNS fields blank as my router gets them automatically.
>>
>> When I try the same thing in XP in TCP/IP properties for my wifi
>> connection, my PC gets the IP alrght but I lose my internet connection
>> and can only get it back if I revert to getting my IP automatically.
>>
>> Any help please?
>
> Some routers have a way to define fixed DHCP addresses for particular
> MAC addresses -- that's the best way.

I checked and mine doesn't, my old Netgear one did but this one don't.

Otherwise, you need to be sure:
> (1) that your manual IP address is in the correct subnet
> (2) that the subnet mask is correct

both those were correct

> (3) that you've manually set the correct DNS server(s)

this is the part I didn't enter, I think because in Mac OS X there is an
option 'DHCP with manual address' where you don't have to enter any DNS
servers, aslo my router doesn't have DNS servers defined.

I used servers from OpenDNS and it works, thanks

Mark McIntyre wrote:
> On Fri, 26 Jan 2007 23:03:03 +0000, in alt.internet.wireless , Mark
> <(E-Mail Removed)> wrote:
>
>> My wifi router uses DHCP, but I want to assign one of my windows XP
>> machines a manual IP that remains the same.
>
> On the XP client, set the IP address you want, enter the router
> address as the gateway, and optionally set the DNS entries. Its best
> to set this, unless you're sure your router does DNS forwarding.

this seems to be the problem though, if I didn't enter DNS servers i'd
lose me internet connection.

On Fri, 26 Jan 2007 23:03:03 +0000, in alt.internet.wireless , Mark
<(E-Mail Removed)> wrote:

>My wifi router uses DHCP, but I want to assign one of my windows XP
>machines a manual IP that remains the same.

On the XP client, set the IP address you want, enter the router
address as the gateway, and optionally set the DNS entries. Its best
to set this, unless you're sure your router does DNS forwarding.

>In mac os x, to do this I go onto TCP/IP prefs and choose 'DHCP with
>manual address' enter my IP, subnet mask and gateway address and then I
>leave the DNS fields blank as my router gets them automatically.

Yup, same as on XP.

--
Mark McIntyre

On Sat, 27 Jan 2007 00:17:50 +0000, Mark <(E-Mail Removed)> wrote in
<45ba9ab8$0$8743$(E-Mail Removed)>:

>Mark McIntyre wrote:
>> On Fri, 26 Jan 2007 23:03:03 +0000, in alt.internet.wireless , Mark
>> <(E-Mail Removed)> wrote:
>>
>>> My wifi router uses DHCP, but I want to assign one of my windows XP
>>> machines a manual IP that remains the same.
>>
>> On the XP client, set the IP address you want, enter the router
>> address as the gateway, and optionally set the DNS entries. Its best
>> to set this, unless you're sure your router does DNS forwarding.
>
>this seems to be the problem though, if I didn't enter DNS servers i'd
>lose me internet connection.

<quibble> That just prevents you from resolving domain name addresses,
not connecting to the Internet. </quibble> IP addresses (e.g.,
64.233.161.99 instead of www.google.com) would probably work.

--
Best regards, FAQ for Wireless Internet: <http://Wireless.wikia.com>
John Navas FAQ for Wi-Fi: <http://wireless.wikia.com/wiki/Wi-Fi>
Wi-Fi How To: <http://wireless.wikia.com/wiki/Wi-Fi_HowTo>
Fixes to Wi-Fi Problems: <http://wireless.wikia.com/wiki/Wi-Fi_Fixes>

On Sat, 27 Jan 2007 00:17:50 +0000, in alt.internet.wireless , Mark
<(E-Mail Removed)> wrote:

>Mark McIntyre wrote:
>> On Fri, 26 Jan 2007 23:03:03 +0000, in alt.internet.wireless , Mark
>> <(E-Mail Removed)> wrote:
>>
>>> My wifi router uses DHCP, but I want to assign one of my windows XP
>>> machines a manual IP that remains the same.
>>
>> On the XP client, set the IP address you want, enter the router
>> address as the gateway, and optionally set the DNS entries. Its best
>> to set this, unless you're sure your router does DNS forwarding.
>
>this seems to be the problem though, if I didn't enter DNS servers i'd
>lose me internet connection.

Not all routers automatically forward DNS requests. My Dlink 604
doesn't, my SMC 2804 does.

If you set a static IP addy, the DNS requests will default to going to
the gateway I think. If your gateway (which is also your router)
forwards DNS it will work. Otherwise it won't.
--
Mark McIntyre

On Sat, 27 Jan 2007 16:54:25 +0000, Mark McIntyre
<(E-Mail Removed)> wrote in
<(E-Mail Removed)>:

>On Sat, 27 Jan 2007 00:17:50 +0000, in alt.internet.wireless , Mark
><(E-Mail Removed)> wrote:
>
>>Mark McIntyre wrote:
>>> On Fri, 26 Jan 2007 23:03:03 +0000, in alt.internet.wireless , Mark
>>> <(E-Mail Removed)> wrote:
>>>
>>>> My wifi router uses DHCP, but I want to assign one of my windows XP
>>>> machines a manual IP that remains the same.
>>>
>>> On the XP client, set the IP address you want, enter the router
>>> address as the gateway, and optionally set the DNS entries. Its best
>>> to set this, unless you're sure your router does DNS forwarding.
>>
>>this seems to be the problem though, if I didn't enter DNS servers i'd
>>lose me internet connection.
>
>Not all routers automatically forward DNS requests. My Dlink 604
>doesn't, my SMC 2804 does.

That's generally done by DNS proxy in the router, and would be
configured by DHCP or manually. DNS proxy is almost always optional --
external DNS servers can be directly used instead.

>If you set a static IP addy, the DNS requests will default to going to
>the gateway I think.

DNS requests will go to whatever is manually configured for DNS
server(s). If no configuration is made (manual or by DHCP), then DNS
won't work at all.

>If your gateway (which is also your router)
>forwards DNS it will work. Otherwise it won't.

Pretty much any router should "forward" DNS requests (just as it
forwards other Internet traffic). The real issue is whether the router
has a DNS proxy or not. If it does, then the router LAN address can be
manually configured as the DNS server in all clients; otherwise, the
address(es) of external DNS servers needs to be manually configured
(which works even if the router has a DNS proxy).

--
Best regards, FAQ for Wireless Internet: <http://Wireless.wikia.com>
John Navas FAQ for Wi-Fi: <http://wireless.wikia.com/wiki/Wi-Fi>
Wi-Fi How To: <http://wireless.wikia.com/wiki/Wi-Fi_HowTo>
Fixes to Wi-Fi Problems: <http://wireless.wikia.com/wiki/Wi-Fi_Fixes>