Cable Modems??

Cable Modems??

[Hal MacArgle]

Greetings: In the country we'll probably never have a cable modem but
my son does and that opens the query box as to how I can learn more
about them and their use..

He gave me his IPv4 address, which is, to me, odd that it's Class A,
and I used 'nslookup' and 'DiG' to get his human address..

Trying 'telnet' to the address fails as well as 'ping'... I've
studied networking and have two older books on TCP/IP - neither of
much use here - I don't believe - unless I've missed something..
I would like to become a user on his machine sending mail direct,
etc, if possible..

A former Unix programmer but running WindowsXP on his machine 24/7,
he is stumped, for the time being, too.. I believe I remember reading
that 'ping' is obsolete with the "new" lashups, but can't find much
info.. Maybe he's suffering from Microsofitis.. :^)..

Cheers and TIA for any suggestions..

    Hal - in Terra Alta, WV - Slackware GNU/Linux 8.0   (2.4.13)
	       haltec@iceweb.net | w8mch@iceweb.net..
.
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Re: Cable Modems??

[Ray Olszewski]

Hal -- Without some details, I doubt anyone here is going to be able to 
help you. To the extent that the problems derive from details of Windows XP 
... well, this is a Linux list, so I doubt we'll be of much help at that 
level in any case.

First, what is the address? How stable is it? (What I mean is that cable 
modem ISPs usually use DHCP to assign addresses, and in some cases the 
leases have amazingly short lives, even as short as 15-30 minutes between 
address changes.) For ISPs to use Class A addresses isn't that odd, BTW; I 
see a lot of 24.b.c.d adresses, just as an example.

Second, what are the symptoms in the failures? When telnet or ping fails, 
it usually does so with some sort of error message, and the error message 
tells one (if one is experienced) something about the likely source of the 
problem. If they fail silently, there is usually a delay before they fail; 
knowing roughly how long it is is also informative. I'm not sure what you 
mean by "the 'new' lashups", but if ping has become obsolete, it is news to me.

Third, what does "traceroute" tell you? Where does it stop?

Fourth, when you are connected, can your son ping you? Can you ping other, 
known-good sites (big names, say, or even me, if you need a target)? Can 
he? In any cases where the answer is no, what does the failure look like?

Fifth, I'm no Windows expert (though I do use Windows machines) and I've 
never run XP. Is your son sure he is running a telnet server on his 
machine? (I'm putting aside for the moment the usual concerns about the 
safety of using telnet in the interest of troubleshooting the immediate 
problem.) If you are running a telnet daemon, can he telnet to you?

Sixth, does your son run any sort of firewalling package on his system? If 
so, might it be interfering with connectivity somehow?

At 01:00 PM 9/8/02 -0400, Hal MacArgle wrote:
>Greetings: In the country we'll probably never have a cable modem but
>my son does and that opens the query box as to how I can learn more
>about them and their use..
>
>He gave me his IPv4 address, which is, to me, odd that it's Class A,
>and I used 'nslookup' and 'DiG' to get his human address..
>
>Trying 'telnet' to the address fails as well as 'ping'... I've
>studied networking and have two older books on TCP/IP - neither of
>much use here - I don't believe - unless I've missed something..
>I would like to become a user on his machine sending mail direct,
>etc, if possible..
>
>A former Unix programmer but running WindowsXP on his machine 24/7,
>he is stumped, for the time being, too.. I believe I remember reading
>that 'ping' is obsolete with the "new" lashups, but can't find much
>info.. Maybe he's suffering from Microsofitis.. :^)..


--
-------------------------------------------"Never tell me the odds!"--------
Ray Olszewski					-- Han Solo
Palo Alto, California, USA			  ray@comarre.com
-------------------------------------------------------------------------------

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Re: Cable Modems??

[David Lane]

Ping is definitely NOT obsolete.Before I speculate too much you should post
the IP address you are trying to ping or telnet to.Most cable and DSL modems
contain their own IP's that are in the private range.If your trying to ping
or telnet to one of those you can give it up,the user can but you on the
outside can't.You can only ping or telnet to his public IP that he is
assigned when he connects.
    XP does have the capability to setup an incoming connection for VPN but
unless your son has a static IP(not likely these days)this will be more of a
hassle than it's worth as his IP  probably changes at least every three days
even if he is connected 24/7.Have your son run "ipconfig" in a DOS window
and that will/should give you his public IP.
   Send the IP you were trying to ping and I'll try to give you a better
answer.

                            David Lane

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Re: Cable Modems??

[John Amdor III]

On the other hand, if he DOES have a non-private routable IP address, by 
posting it to the list he will invite all manner of 'helpful' attempts 
to crack his network.

The non-routeable addresses or private IP addresses  according to RFC 
1918 fall in the ranges of:

10.0.0.0 - 10.255.255.255
172.16.0.0 - 172.31.255.255
192.168.0.0 - 192.168.255.255

If the IP you are trying to ping is in one of these ranges, it shouldn't 
be reachable across the Internet - at a minimum your ISP's routers are 
programmed to ignore requests to route to these addresses.

Just because this is a linux list doesn't mean the script kiddies 
haven't figured out how to read these messages.

John Amdor

David Lane wrote:
> Ping is definitely NOT obsolete.Before I speculate too much you should post
> the IP address you are trying to ping or telnet to.Most cable and DSL modems
> contain their own IP's that are in the private range.If your trying to ping
> or telnet to one of those you can give it up,the user can but you on the
> outside can't.You can only ping or telnet to his public IP that he is
> assigned when he connects.
>     XP does have the capability to setup an incoming connection for VPN but
> unless your son has a static IP(not likely these days)this will be more of a
> hassle than it's worth as his IP  probably changes at least every three days
> even if he is connected 24/7.Have your son run "ipconfig" in a DOS window
> and that will/should give you his public IP.
>    Send the IP you were trying to ping and I'll try to give you a better
> answer.
> 
>                             David Lane

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Re: Cable Modems??

[Hal MacArgle]

Greetings Gentlemen: Thanks much for the responses, I have the info I
need to go further with this if my son is really interested..

His IP4v is 68.x.x.x, and my running DiG has answered most of the
other questions.. I don't want to go futher and possibly compromise
anything.. I've learned a lot with this short thread and appreciate
the input.. My biggest problem is with the syntax methinks..

Cheers and thanks again,

    Hal - in Terra Alta, WV - Slackware GNU/Linux 8.0   (2.4.13)
	       haltec@iceweb.net | w8mch@iceweb.net..

On Mon, Sep 09, 2002 at 02:49:54PM -0500, John Amdor III wrote:
> On the other hand, if he DOES have a non-private routable IP address, by 
> posting it to the list he will invite all manner of 'helpful' attempts 
> to crack his network.
> 
> The non-routeable addresses or private IP addresses  according to RFC 
> 1918 fall in the ranges of:
> 
> 10.0.0.0 - 10.255.255.255
> 172.16.0.0 - 172.31.255.255
> 192.168.0.0 - 192.168.255.255
> 
> If the IP you are trying to ping is in one of these ranges, it shouldn't 
> be reachable across the Internet - at a minimum your ISP's routers are 
> programmed to ignore requests to route to these addresses.
> 
> Just because this is a linux list doesn't mean the script kiddies 
> haven't figured out how to read these messages.
> 
> John Amdor


> 
> David Lane wrote:
> > Ping is definitely NOT obsolete.Before I speculate too much you should post
> > the IP address you are trying to ping or telnet to.Most cable and DSL modems
> > contain their own IP's that are in the private range.If your trying to ping
> > or telnet to one of those you can give it up,the user can but you on the
> > outside can't.You can only ping or telnet to his public IP that he is
> > assigned when he connects.
> >     XP does have the capability to setup an incoming connection for VPN but
> > unless your son has a static IP(not likely these days)this will be more of a
> > hassle than it's worth as his IP  probably changes at least every three days
> > even if he is connected 24/7.Have your son run "ipconfig" in a DOS window
> > and that will/should give you his public IP.
> >    Send the IP you were trying to ping and I'll try to give you a better
> > answer.
> > 
> >                             David Lane
> 
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Re: Cable Modems??

[David Lane]

Your right , I'm sorry.Just came home from work when I posted that and just
wasn't thinking...............

                                                     David Lane

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