A range of IP address will be able while the other range won't...
You new range of IP addresses will be:
192.168.0.0 - 192.168.1.255
Your old range is:
192.168.0.0-192.168.0.255
As long are you keep your default gateway at 192.168.0.254 you should be
fine. However, if you move your gateway to e.g. 192.168.1.254 your current
network devices won't be able to get to it.
Also note that if you start using new range, new and old devices won't be
able to communicate among themselves until you reconfigure old devices to
new subnet mask.
--
Mike
Microsoft MVP - Windows Security
>I appreciate your input on this. I am learning (slowly). I am a bit
>confused. Suppose I have a device (pc1) with address 192.168.0.100 with
>mask 255.255.255.0. I also have a device (router) with 192.168.0.254 also
>with 255.255.255.0.
> Supposed I change the mask on the ROUTER to 255.255.254.0. Woun't pc1
> still work correctly? Won't router be able to communicate with pc1? Will
> pc1 be able to communicate THROUGH the router (for example to the
> internet)?
> I can understand that a device with 192.168.1.100/23 (pc2) can't
> communicate with pc1/24, but couldn't all 192.168.0.x devices still
> communicate?
>
>
> "Miha Pihler [MVP]" <mihap-(E-Mail Removed)> wrote in message
> news:%2390nhO$(E-Mail Removed)...
>> Yes -- because this device with subnet mask 255.255.254.0 will calculate
>> which computers are in same subnet differently then a device with 24 bit
>> subnet mask (255.255.255.0). So the problem could look something like
>> this:
>>
>> Let say you have a device with subnet 24 bit subnet mask (255.255.255.0)
>> and it sends a packet to a device with subnet mask 255.255.254.0. Since
>> your original host (PC) has old subnet mask it will send the packet
>> directly to the destination host (router, PC, ...). Now the other device
>> has new subnet mask and by applying new subnet mask it calculates that it
>> should reply to computer that is not on the same subnet and sends the
>> packet to its default gateway. Result is that the original client never
>> receives the response...
>>
>> You will have to make a plan to move all your devices to new subnet mask
>> in a short period of time (e.g. a weekend).
>>
>> --
>> Mike
>> Microsoft MVP - Windows Security
>>
>> "Jeff Hofstetter" <(E-Mail Removed)> wrote in message
>> news:%23Cz%23ZB$(E-Mail Removed)...
>>> That makes sense. If I start changing the subnet mask now, should I
>>> experience any problems? In other words, if I change the mask on a
>>> router to 255.255.254.0, will that cause any problems with all of my
>>> existing devices?
>>>
>>> "Miha Pihler [MVP]" <mihap-(E-Mail Removed)> wrote in message
>>> news:OUKYzb%(E-Mail Removed)...
>>>> Hi Jeff,
>>>>
>>>> You will also need to reconfigure all other network devices to same
>>>> subnet mask (new subnet mask 255.255.254.0) or you will soon run into
>>>> communication problems with some of these devices e.g. servers,
>>>> printers, routers, switches ... etc...).
>>>>
>>>> --
>>>> Mike
>>>> Microsoft MVP - Windows Security
>>>>
>>>> "Jeff Hofstetter" <(E-Mail Removed)> wrote in message
>>>> news:uuVXDR%(E-Mail Removed)...
>>>>> Our private network is currently 192.168.0.0 /24. We are getting close
>>>>> to needing some more addresses. Can I just change my subnet mask to
>>>>> 255.255.254.0, change my dhcp server and add another 254 addresses or
>>>>> is there more to it?
>>>>>
>>>>
>>>>
>>>
>>>
>>
>>
>
>
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