Puzzled by internet

Puzzled by internet

Post by simmonr5.. » Mon, 18 Oct 1993 11:48:22



Okay, Im not a newbie to the UNIX system, but I have one question that
has either gone unaswered or answered in an unsatifactory manner to me
though I have consulted many sources.

The deal is, SLIP is a recent invention, so we can assume that most of the
present doy systems on the internet do not use it to connect to the heart
of the internet. Therefore my question is how do these other new machines
at colleges who want to get internet on ETHERNET accomplish this miracle
without running a cable 400 miles to the nearest connected site. I am
sure that I am missing something here. I am interested in the hardware
that is in practical, everyday use, not theories of how the various net
layers work. Would someone please enlighten me on this.

I want to know,
1) what hardware is required
2) how to get my beautiful new pentium based linux system internetted
via internet and the total estimated cost outlay for this.

-- Sincerely (or as sincere as I ever get)
-- Rob

 
 
 

Puzzled by internet

Post by Robert Mos » Mon, 18 Oct 1993 13:00:28



>at colleges who want to get internet on ETHERNET accomplish this miracle
>without running a cable 400 miles to the nearest connected site. I am
>sure that I am missing something here. I am interested in the hardware

How do the colleges do it?  They do precisely what you said they wouldn't do,
they run a cable 400 miles to the nearest connect.  Actually, they generally
lease a line from a data carrier.  Most of the long distance carriers offer
this.  At UF, T1 lines are used to connect us to SURA net in Maryland.  
Most institutions will use T1 (1.5MBPS) and T3 (42MBPS) lines, depending on
traffic.  AT&T, Sprint, WilTel and many others offer these services.  In
addition, a gateway is required at each end.

Quote:>I want to know,
>1) what hardware is required
>2) how to get my beautiful new pentium based linux system internetted
>via internet and the total estimated cost outlay for this.

If you as an individual want internet, by far the cheapest is to get some
kind soul to give you a slip connection from campus.  Since these are hard
to come by, there is at least one commercial offering available.  UUNET
offers dialup slip for the neighborhood of $250 per month, with a one-time
startup fee (I don't remember how much).  They offer higher rate connections
upto 10MBPS, but they get out of the reach of individuals.  

I would welcome postings and mail regarding other internet connections
available to individuals.  I will post a summary article of the mail
responses I receive.

Hope this helps,

ARAW

 
 
 

1. Internet Multicasting Puzzle

All:

I am trying to figure out why a client can't see UDP packets generated from
my Multicasting server.  Here are the facts:

Server-

- Mandrake Linux v9.1 OS
- Perl UDP Socket
- DSL/ppp0 interface to Internet
- Destination, 234.x.x.x:PortB
- TTL = 255

Client (across Internet)-

- Java app./socket
- Linksys DSL router (DMZ - no security settings for testing purposes)
- DSL connection to Internet
- Multicast Group added through Java app.

Verify

- Ethereal sniffer on both server and client
- Packet Length = 104 bytes
- TTL verified
- frame captured - sent 88 bytes from 207.x.x.x:PortA to 234.x.x.x:PortB

The client can't see the messages!

Any suggestions of what to try would be greatly appreciated.

Thank you in advance,

Moose

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