PLEASE: Really need your help. RS232 to 10baseT

PLEASE: Really need your help. RS232 to 10baseT

Post by Todd All » Tue, 09 Jun 1998 04:00:00



Let me thank you all in advance.  I have been a fan of the Linux
movement and hope Linux will be biger then MickeySoft.

Well here is what I need help on.  I have an old Compaq laptop that I
will be using as a Lanalyser for our network.  The laptop will monitor
over 3000 systems, and connections from the internet into our network.
I want to install Redhat 5.0 and connect it to the hub.  The problem
is the laptop does not have an ethernet card.  We need to make a
connection from the RS232 seiral port.

What I am looking for is how do I make an RS232 wired to ethernet
connection.  Pin placement.  and what packages need to be installed,
this is just going to be a min install so it can do only Lanalysing.
I also don't want it to be seen from the internet.  

System
486 66
120mg hard drive
8mg ram

any and all your help would be greatly appricatated.

please post and send to my email

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~`
Todd M. Allen
Network Support.                                    Cochise College

 
 
 

PLEASE: Really need your help. RS232 to 10baseT

Post by Ia » Thu, 11 Jun 1998 04:00:00




Quote:> Well here is what I need help on.  I have an old Compaq laptop that I
> will be using as a Lanalyser for our network.  The laptop will monitor
> over 3000 systems, and connections from the internet into our network.
> I want to install Redhat 5.0 and connect it to the hub.  The problem
> is the laptop does not have an ethernet card.  We need to make a
> connection from the RS232 seiral port.

You can't. You'll need to get an ethernet card, RS232 and ethernet are
as alike as cows and computers (disregarding Gateway).

--
Ian - Edit address before mailing. | Have you got a question you want to ask
     Running Linux in the UK.      | Usenet? Search www.dejanews.com first!
             -- There are no facts, only opinions --

 
 
 

PLEASE: Really need your help. RS232 to 10baseT

Post by Ken Roberts # » Sat, 13 Jun 1998 04:00:00



> What I am looking for is how do I make an RS232 wired to ethernet
> connection.  Pin placement.  and what packages need to be installed,
> this is just going to be a min install so it can do only Lanalysing.
> I also don't want it to be seen from the internet.

As another post says, the RS232 and 10baseT are electrically different as
well as package difference.  The only way for you to work this out is:

1 - If you have a PCMCIA socket, get a PCMCIA ethernet card for the laptop

2 - Get a regular computer with network card, install Linux on that

- Ken

 
 
 

1. Please Guys, I really need your help / routing

Hi all,

i really need your help with this one guys. I have put down a few other
posts but to no avail.

This is as far as i have gotten. Im using Linux as my router, it hosts web /
mail behind the router (internal network using 192.168.*.*). I am using
ipmasqadm portfw to forward the ports from the live interface to the private
machine. But it is not working.

I know that is i dial the linux box up with a modem and adjust the
forwarding rules to suit the new ip it all works.

I have used iptraf to find out whats going on and i can see the following:

202.76.128.30:1040                                                     =
3             180     S---       eth1       x
203.134.168.14:pop-3                                                  =
0               0     ----       eth1       x
202.76.128.30:1040                                                     =
3             180     S---       eth0       x
192.168.5.10:pop-3                                                      =
0               0     ----       eth0       x

As you can see, the originating IP comes in on and is connected to port 110
(pop3) it is then redirected to the internal address on the same port. From
this i would assume that the port forwarding is working. However the client
machine making the request cant connect. As yes the mail server is running
on that machine as i can telnet to it from the linux box doing the
forwarding


Trying 192.168.5.10...
Connected to 192.168.5.10.
Escape character is '^]'.
+OK Microsoft Exchange POP3 server version 5.5.2650.23 ready

Please if you can help with this problem it would be fantastic. I really am
at a loss

Dave

2. Even Compaq feared Microsoft.

3. I need really help, please I don't what can i do !!!!

4. Matrox Millennium RAMDAC always detected as 175MHz?

5. please, oh please, someone help me, i'm really stuck

6. Need: random [-er] [denominator]

7. PLEASE HELP: Win95 <- 10BaseT -> Linux 1.2.13

8. how to get memory size?

9. Help setting up Samsung 10BaseT NICS please

10. RS232 woes on system console - please help!!!

11. RS232 Help please

12. USB serial converter to RS232- HELP Please.

13. RS232 Help Please