[MLB-WIRELESS] Waterproof Boxes & IP Allocation

[Ben Holko]

For IPv6 you apply to your provider, and they will issue you a /48

IPv6 is not in very widespread use yet.

If you want privates, you use what's calle link local - kind of like the
reserved RFC 1918 blocks of IPv4

http://www.apnic.net/services/ipv6_guide.html

B.


-----Original Message-----
From: owner-melbwireless at wireless.org.au
[mailto:owner-melbwireless at wireless.org.au]On Behalf Of Chris Samuel
Sent: Tuesday, April 29, 2003 5:44 PM
To: melbwireless at wireless.org.au
Subject: Re: [MLB-WIRELESS] Waterproof Boxes & IP Allocation


-----BEGIN PGP SIGNED MESSAGE-----

On Tuesday 29 Apr 2003 10:57 am, Dan Flett wrote:

> What is an IP Block?  Is it a range of IP addresses that the node can use?

Exactly correct, well guessed.

> What is the /28 part of the address?

IPv4 (standard Internet IP addresses, rather than new, funky, IPv6 ones) use
32 bit values.  The /28 means that the first 28 bits of the address are used
for the "network address" of the block, leaving the bottom 4 bits for the
"host address".  To work out the maximum value of a binary value you take
the
number of bits to the power of two (because binary has just two values per
bit), so you get 4^2 addresses = 16.

Now, you loose two of those automatically because one becomes the network
address (the lowest possible value) and one becomes the broadcast address
(the highest possible value).  Never put a host as one of those!

So, as an example from one of the ones you quoted:

10.10.144.128/28

The network address is 10.10.144.128.
The broadcast address is 10.10.144.143
Hosts can be in the range 10.10.144.129 -> 10.10.144.142

There's a neat utility called "ipcalc" that comes with some Linux
distributions that can work these sort of things out for you, e.g. :

$ ipcalc -n 10.10.144.128/28
NETWORK=10.10.144.128

$ ipcalc -b 10.10.144.128/28
BROADCAST=10.10.144.143

The "$ " is just the prompt of the command line.

Oh, I mentioned IPv6 earlier, that uses 128 bits of addressing, so you get 4
times as much address space, billions & billions of possibilities (where's
Carl Sagan when you need him?).

> And how does one get a block allocated to them?

Er, pass on that one. :-)

- --
 Chris Samuel  :  http://csamuel.org/  :  Melbourne, VIC

 Need someone with 10 years of Linux, Unix, Networking
   & IT Security skills in Melbourne, VIC ? Email me.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.7 (GNU/Linux)

iQEVAwUBPq4tOo1yjaOTJg85AQFknAf9GjcWqDL0gT+utqsP+Q7klpX1YqDe+RkI
zxJrI4I2UMd1wRfCMXDXN8du6P+H3jxcFXAX/XBjAKT3E2g3IMlip/3I/LgWaHET
y+43QcE21R0vgyClA4kVI0NiI8aNubS/Z89zUjtHABbsDVMuUhvzhgoiA2yA6RSv
omnD/ZneHOXkC6VVADmbe96YTmUn+dMjbKEyr+I0IAjJhaRnhArr7ivbYO6mwd9c
tkMiRivkSEsX1TvBo1Hezu73wLLuxGT4CBwNh2rVskwgzNHm+QdkMdP/gs1o6gXS
GPK27ERM3WpVjOe72wWIdNIrayqfS8/N7vU/CxfIA5mqPKKjzuVFIw==
=xv02
-----END PGP SIGNATURE-----


To unsubscribe: send mail to majordomo at wireless.org.au
with "unsubscribe melbwireless" in the body of the message




To unsubscribe: send mail to majordomo at wireless.org.au
with "unsubscribe melbwireless" in the body of the message