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USA Tymnet 3106
USA Telenet 3110
USA Autonet 3126
USA RCA 3113
Australia Austpac 0505
Ireland Irepac 2724
Luxembourg Luxpac 2704
Singapore Telepac 5252
France Transpac 2080
Switzerland Telepac 2284
Sweden Telepac 2405
Israel Isranet 4251
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* - DNIC (Data Network Identification Code)
Precede DNIC and logical address with a
'0' when using Telenet.
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Notes On Above Networks -
Some countries may have more than one Packet Switching Network. The ones
listed are the more significant networks for each country. For example, the
United States has eleven public Packet Switching Networks, but the four I
listed are the major ones.
Several countries may also share one network, as shown above. Each country
will have equal access to the network using the basic POTS dial-up ports.
Focus On Telenet -
Since Telenet is one of the most famous, and highly used PSNs in the United
States, I thought that informing you of some of the more interesting aspects
of this network would be beneficial.
Interconnections With Other Network Types -
Packet Switched Networks are not the only type of networks which connect a
large capacity of hosts together. There are also Wide Area Networks, which
operate on a continuous link basis, rather than a packet switched basis.
These networks do not use the standardized X.25 protocol, and can only be
reached by direct dial-ups, or by connecting to a host which has network
access permissions. The point is, that if you wanted to reach, say, Arpanet
from Telenet, you would have to have access to a host which is connected to
both networks. This way, you can connect to the target host computer via
Telenet, and use the WAN via the target host.
WANs aren't the only other networks you can access. Also, connections to
other small, private, interoffice LANs are quite common and quite feasible.
Connections To International NUAs via NUIs -
When using an NUI, at the prompt, type 0+DNIC+NUA. After your connection
is established, proceed to use the system you've reached.
Private Data Networks -
Within the large Packet Switched Networks that are accessible to us there
are also smaller private networks. These networks can sometimes be very
interesting as they may contain many different systems. A way to identify a
private network is by looking at the three digit prefix. Most prefixes
accessible by Telenet are based on area codes. Private networks often have a
prefix that has nothing to do with any area code. (Ex. 322, 421, 224, 144)
Those prefixes are not real networks, just examples.
Inside these private networks, there are often smaller networks which are
connected with some type of host selector or gateway server. If you find
something like this, there may be hosts that can be accessed only by this port
selector/server, and not by the normal prefix. It is best to find out what
these other addresses translate to, in case you are not able to access the
server for some reason. That way, you always have a backup method of reaching
the target system (Usually the addresses that are accessed by a gateway
server/port selector translate to normal NUAs accessible from your Telenet
port).
When exploring a private network, keep in mind that since these networks
are smaller, they would most likely be watched more closely during business
hours then say Telenet or Tymnet. Try to keep your scanning and tinkering
down to a minimum on business hours to avoid any unnecessary trouble.
Remember, things tend to last longer if you don't abuse the hell out of them.
Summary -
I hope this file helped you out a bit, and at least gave you a general idea
of what PSNs are used for, and some of the advantages of using these networks.
If you can find something interesting during your explorations of PSNs, or
Private Data Networks, share it, and spread the knowledge around. Definitely
exploit what you've found, and use it to your advantage, but don't abuse it.
If you have any questions or comments, you reach me on -
The FreeWorld II/Central Office/Forgotten Realm/TOP.
I hope you enjoyed my file. Thanks for your time. I should be writing a
follow up article to this one as soon as I can. Stay safe..
- Epsilon
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- Thanks To -