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- HUB IP ADDRESS
- ~~~~~~~~~~~~~~
- The HUB IP address should have been given to you when
- you were issued with your own IP address. However, it
- may have been overlooked. Don't panic! If you have a
- HUB in your area that has existed for any length of
- time, NOSINST will attempt to calculate the right HUB
- address for you.
-
- HUBs usually occupy the first address in any block of
- 32. However, this is not a universal rule. Some
- areas have much larger blocks allocated to each HUB,
- in which case this program will not be able to help
- you. You will have to ask local stations for the
- information.
-
- Why do HUBs occupy the first address in a block?
- The short and simple answer is; to simplify mail and
- live link routing. For instance, take a user with an
- address of 44.131.19.165. Take the last number (165)
- and divide it by 32, (5 remainder 5), throw away the
- remainder, then multiply what's left by 32, equals
- 160. You now have the most likely address for a HUB
- that routes mail for that station. Now, all this maths
- is just to show you that one could route mail to a HUB
- by saying "send anything with an address in the range
- 44.131.19.160 to 44.131.19.191 to the HUB with the
- address 44.131.19.160". In fact, "masking" off IP
- addresses is very simple in real terms and is just one
- mathematical operation (IPaddress AND 0xffffffe0 for
- those that understand computer maths).
-
- The end result of the above calculation is a block of
- addresses under the "wing" of a HUB station.
-
- It should be clear how vital it is to get the correct
- information and also how difficult the explanation can
- sound even though it's easy! hi.
-