[isalist] Re: Isa 2004 and CIDR?
- From: "Thor (Hammer of God)" <thor@xxxxxxxxxxxxxxx>
- To: "isalist@xxxxxxxxxxxxx" <isalist@xxxxxxxxxxxxx>
- Date: Wed, 12 Jul 2006 08:14:55 -0700
http://www.ISAserver.org
-------------------------------------------------------
Actually, the mask designates the Network ID. This from the RFC itself:
3. Private Address Space
The Internet Assigned Numbers Authority (IANA) has reserved the
following three blocks of the IP address space for private internets:
10.0.0.0 - 10.255.255.255 (10/8 prefix)
172.16.0.0 - 172.31.255.255 (172.16/12 prefix)
192.168.0.0 - 192.168.255.255 (192.168/16 prefix)
We will refer to the first block as "24-bit block", the second as
"20-bit block", and to the third as "16-bit" block. Note that (in
pre-CIDR notation) the first block is nothing but a single class A
network number, while the second block is a set of 16 contiguous
class B network numbers, and third block is a set of 256 contiguous
class C network numbers.
So there. ;)
t
On 7/12/06 8:09 AM, "Thomas W Shinder" <tshinder@xxxxxxxxxxx> spoketh to
all:
> http://www.ISAserver.org
> -------------------------------------------------------
>
> It's actually a network ID, not a sub-network ID
>
> Thomas W Shinder, M.D.
> Site: www.isaserver.org
> Blog: http://blogs.isaserver.org/shinder/
> Book: http://tinyurl.com/3xqb7
> MVP -- ISA Firewalls
>
>
>
>> -----Original Message-----
>> From: isalist-bounce@xxxxxxxxxxxxx
>> [mailto:isalist-bounce@xxxxxxxxxxxxx] On Behalf Of Thor
>> (Hammer of God)
>> Sent: Wednesday, July 12, 2006 10:07 AM
>> To: isalist@xxxxxxxxxxxxx
>> Subject: [isalist] Re: Isa 2004 and CIDR?
>>
>> http://www.ISAserver.org
>> -------------------------------------------------------
>>
>> Well, to be pedantic, 1918 specifies 192.168.0.0 as a "block"
>> of 256 C-Class
>> subnets, not as a subnet in itself. So you really can't call
>> 192.168 a /16
>> subnet.
>>
>> t
>>
>>
>> On 7/12/06 7:57 AM, "Jim Harrison" <jim@xxxxxxxxxxxx> spoketh to all:
>>
>>> http://www.ISAserver.org
>>> -------------------------------------------------------
>>>
>>> 1. Per RFC 1918, 192.168 is a /16 subnet; not a /24.
>>> 2. ISA will not care so long as you define the network properly.
>>>
>>> Sent via WM5-enabled PPC-phone
>>>
>>> -----Original Message-----
>>> From: "Taps" <Taps@xxxxxxxxxxxx>
>>> To: isalist@xxxxxxxxxxxxx
>>> Sent: 7/11/06 18:47
>>> Subject: [isalist] Isa 2004 and CIDR?
>>>
>>> http://www.ISAserver.org
>>> -------------------------------------------------------
>>>
>>> I know this is going to sound like a silly question, but I
>> cant find any
>>> information confirming or denying this:
>>>
>>> We are currently using a 192.168.140.0/24 subnet in our internal
>>> network. Recently, we have started using VMWare to do
>> support of some
>>> of our customers. We like to have duplicate setups of
>> their servers in
>>> our virtual environment. At the extreme, our customers have
>> 7 separate
>>> servers per site which we duplicate. We have recently
>> acquired many new
>>> customers and about half our what we term "multi-site". So
>> there is a
>>> possiblity of 14 or 21 servers. Each of which needing a static IP
>>> address (because of the stupid way the software is written).
>>>
>>> With the addition of these, plus the rest of our network,
>> we are running
>>> out of IP Addresses. I am thinking of dropping the subnet
>> mask back to
>>> a /23 or /22. To give me a usable range of
>>> 192.168.140.1-192.168.143.254.
>>>
>>> I realizing because of CIDR, the theory of 192.x.x.x needing to be a
>>> classC isnt an absolute anymore. But before I go through
>> and make any
>>> changes, I was wondering if anyone could confirm or deny
>> that ISA will
>>> handle this without any major issues.
>>>
>>> Before you ask, yes, I plan on testing this before I roll
>> it out. But
>>> that wont be for a while. I figured if anyone had tried something
>>> similar they could clue me in on any issues that they might
>> have had.
>>> If someone has tried it and it just wont work, then I will
>> find another
>>> alternative.
>>>
>>> And yes, switching to a 10.x.x.x address was considered. But again,
>>> with the way some of the software was written, the IP
>> addresses would
>>> need to stay the same.
>>>
>>>
>>>
>>> --
>>>
>>> Taps@xxxxxxxxxxxx
>>> http://Taps.Iniquity.Org
>>> - "What spirit is so empty and blind, that it cannot
>> recognize the fact
>>> that the foot is more noble than the shoe, and skin more
>> beautiful than
>>> the garment with which it is clothed?"
>>> -- Michaelangelo
>>>
>>> - "Build a man a fire, and he'll be warm for a day. Set a man on
>>>
>>>
>>> All mail to and from this domain is GFI-scanned.
>>>
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