Re: Ethernet x-over cable

We have set up proxy servers attached to ADSL lines.  I have one at my house
and another at my office.  We have also done this at my son's school.  The
basic line is don't tell them.  Just order the service, have the cable
company (or phone company in DSLs case) install the NIC and configure a
stand alone machine to their network.  The after they leave, add a second
NIC card attached to your internal network, get some proxying software and
away you go.  The newest version of WinProxy has full NAT built in, however
their older versions work well too.  As far as running a server on it, well
that is a bit more tricky.  Most PS software will allow you to map a port on
the proxy server to an IP address/port on the internal network, so If you
have an AS400 on your internal network you can map the telnet port of the
AS400 to port on the proxy server.  Of couse the clients connecting must
know what port number will be directed to TELNET on the the AS400.  No biggy
though.  If also give a level of security since the only traffic that can
get to your AS400 is TELNET.  You could also map the WWW port (usually 80)
on the proxy to map to the WWW server (port 80) on your AS400.  I have found
that I was unable to FTP from the Internet to any FTP servers on my Internal
network even if I set up the mapped port.  I think this has something to do
with 2 ports being used for FTP, one for control and one for data.  I also
tried to map the WSG port also to no avail.  I have not had time to upgrade
the office proxy server to the new version that uses NAT to see of the FTP
and WSG problems go away.
CJG

Carl Galgano
EDI Consulting Services, Inc.
540 Powder Springs Street
Suite C19
Marietta, GA  30064
770-422-2995
mailto: cgalgano@ediconsulting.com
http://www.ediconsulting.com
EDI, Communications and AS400 Technical Consulting

-----Original Message-----
From: Jim Langston <jlangston@conexfreight.com>
To: MIDRANGE-L@midrange.com <MIDRANGE-L@midrange.com>
Date: Monday, November 29, 1999 2:03 PM
Subject: Re: Ethernet x-over cable


>Larry,
>
>It sounds like the cable company is not wanting to do what
>they are legally required to do.
>
>Basically, you should be able to use as many computers as
>you want to send over that "wire".
>
>If they don't want to give you additional IP addresses, just
>consider setting up a proxy server.  With a proxy server, you
>give your proxy server a public IP address visible to the internet,
>and you give your other PCs a private IP address, then get
>onto the internet using the proxy server, which proxies all the
>xmissions both ways.
>
>I know with sDSL which we are using, we had to pay a nominal
>additional fee for extra ip address, I think it was like $10/month.
>
>Which gave us 13 IP addresses.  If I didn't want to pay for those
>additional IP addresses I could of just used a proxy server.
>
>A proxy server, though, is basically only good for clients (browsers,
>FTP client, Telnet client, etc...) as the IP address you are connecting
>to with a client must be visible.  With a server the IP address and
>the port must be visible from the internet.  It may, or may not, be
>possible to redirect certain ports to specific machines, I don't know.
>I think it would be possible to have incoming connections on port
>8080 (for example) be redirected to port 8080 on IP 192.168.1.1
>or whatever.  That is something you will have to look at if you
>1. decide to use a proxy server and 2. decide you want to run
>server software.
>
>Regards,
>
>Jim Langston
>
>Larry Bolhuis wrote:
>
>> Brad,
>> <snip>
>> > all share cable internet.  Using NAT instead of proxy.
>> <snip>
>>
>>   What is your cable companies policy on putting a network behind your
cable
>> modem? I am given to understand that they don't like it and expect only 1
PC per
>> cable modem.
>>
>>   Reason for my question is we are trying to get my childrens school
connected
>> this way. Since the cable companies are required to connect the schools
if cable
>> runs past them (and it does) this should give us free Internet.  We are
NOT
>> getting favorable response from the Cable people about this idea!
>>
>>  - Larry
>
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