Re: internet ip addressing
- From: ed <ed@xxxxxxxxxxx>
- Date: Thu, 31 Aug 2006 19:58:00 GMT
On 31 Aug 2006 09:16:03 -0700
"jasonsig" <comp.techs@xxxxxxxxxxxxx> wrote:
Hi, with regards to /31 addressing on point to point links. I have not
seen any real world examples using this type of addressing scheme,
only /30.
Are there any examples of real world 'internet routers' using /31? How
do large organizations
address point to point links?
They use the /30.
With /31 you have the following addresses:
192.168.0.0 = network address
192.168.0.1 = first host address
192.168.0.2 = gateway address
192.168.0.3 = broadcast address
Humm we can't fit all that in the /31 can we, as we only have the first
two available addresses. Granted one can put the gateway on the
broadcast address, but we cannot do that since /31 does not give room
for this.
We cannot put the gateway on the network address, it would just confuse
the hell out of the hosts.
If you *can* set this up, I'd be very surprised. Nearly all ISPs will
use a /30 for their routing equipment, if this equipment is on their
core/backbone network then they will use a larger subnet, perhaps /26 or
/27 for a small second of their devices, but then put /24's in their
customer networks, the routing tables have to be correctly configured
for this so that those network blocks are routed via their core. This is
generally how PTP (Point To Point) routing works. The internet is not
beautifully constructed, network blocks don't traverse down the routing
tree geographically.
--
Regards, Ed :: http://www.openbsdhacker.com
proud unix person
Email sent from Vin Diesel is composed in haiku form.
.
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