Re: FN-FORUM: TCP/IP Properties

date posted 1st February 2007 16:14

Dominic Marsat wrote:
>
>
>> -----Original Message-----
>> From: [EMAIL REMOVED] [EMAIL REMOVED] On Behalf Of Dai
>> Williams
>> Sent: 01 February 2007 09:14
>> To: FN-FORUM / [EMAIL REMOVED]
>> Subject: RE: FN-FORUM: TCP/IP Properties
>>
>>
>> [EMAIL REMOVED] wrote:
>>
>>> Hi All,
>>>
>>> I have tried to change the DNS servers in the 'Internet
>>> Protocol (TCP/IP Properties' dialog box, however receive the
>>> error message 'The combination of IP address and subnet mask
>>> in invalid. All of the bits in the host address portion of
>>> the ip address are set to 1. Please enter a valid combination
>>> of IP address and subnet mask'.
>>>
>>> My default (pre-configured) settings are:
>>>
>>> IP Address: 212.227.xx.xx
>>> Subnet Mask: 255.255.255.255
>>> Gateway: 10.255.255.1
>>>
>>> I've googled for a solution but can find anything. This seems to be
>>> the most relevant: http://www.pcreview.co.uk/forums/thread-215168.php
>>> . I don't understand what's wrong with the settings.
>>>
>>> My server is running Windows 2003 web edition.
>>>
>>> Thanks, Dominic
>>>
>> Dominic,
>>
>> Subnet mask of 255.255.255.255 means you are on a network with one
>> solitary
>> IP address, namely the one you yourself are using. The most exact subnet
>> you can ever want is 255.255.255.254 and even that only allows for one
>> other
>> address. Most common subnets are 255.255.255.0 which means any address
>> with
>> same first three octets is on your network or 255.255.0.0 which means any
>> address with same first two octets is on your network.
>>
>> If you want a more exact explanation of subnets I am sure you can google
>> it
>> up, but I am pretty sure that is where the problem lies, despite the error
>> message seeming to indicate otherwise.
>>
>> HTH,
>>
>> Dai
>>
>
> Hi Dai,
>
> Thanks for your help.
>
> The machine is a dedicated server with 1&1 which started behaving oddly a
> couple of days ago. Support have looked at the machine now and turned DHCP
> on but all the settings have remained the same including the subnet mask
> (using ipconfig /all)!? It appears I have a machine doing the impossible!
>
> Cheers, Dom
>
>
>
Hi,

The 255.255.255.255 subnet mask is valid when specifying the settings
for a PPP adaptor, like an ISDN or ADSL modem. Usually the Gateway
address is identical to the IP Address, though not in the settings you
have presented. Enter the same information into the Gateway field that
you entered into the IP Address field. The subnet mask is set to
255.255.255.255 to prevent IP access to other equipment on the network
at the remote end of the connection. Give it a whirl, see what happens.
And Dai, sanity not confirmed just yet we'll wait to hear back.

Bye.