tcp/ip changes and how to work around them.

From: Tim (timryan_at_solectron.com)
Date: 03/12/04 

Date: 12 Mar 2004 12:01:14 -0800

I work for a company that test products for various companies, one of
the items we need to test is a circuit pack that includes an ethernet
port. We want to be able to verify that the port works, ie., it
responds to a ping. Since time is money, the pack (or packs, sometimes
5 or more will be tested) is simply plugged in and allowed to go
through it's self test, then we ping it. We currently run this test
using an old RedHat 4.1 box. We simply run arp -s IP MAC with an IP
address that we use over and over, then ping that IP. It works
fine,and looking at the network with Ethereal we see echo requests to
the MAC and then echo replies from the MAC. The replies do have the IP
set to 0.0.0.0 since the pack does not know the IP address, but it
works and we can verify that the port will respond.

We want to upgrade to a new "Ping Test" box running a more modern
version of Linux so I've been trying this on RedHat 7.3 and it simply
does not work. I can never get a reply from the card. Using Ethereal I
see the echo requests, and from what I can tell they are the same as
the echo requests from the old box, but I never get an echo reply. I'm
not a network engineer and I simply don't understand why I'm not
getting a reply when using the new box.

Note: The card and the two Linux boxes are on a simple private network
using a hub so that I can see all the network traffic with Ethereal.
At all times I can see RARP "who is" requests from the card so I know
it is on the network.

Any idea why this will not work on a new version of Linux? Any idea
how to get a reply?

Thanks,
Tim

Relevant Pages

  • Re: tcp/ip changes and how to work around them.
    ... Tim wrote: ... Since time is money, the pack (or packs, sometimes ... > fine,and looking at the network with Ethereal we see echo requests to ...
    (comp.os.linux.networking)
  • RE: Cannot connect to ANY network
    ... The list of servers for this workgroup is not currently available ... I have run the network setup wizard many times both in this method ... > and even a few attempts after Service Pack Two. ... > built in ethernet or my wireless lan external card, ...
    (microsoft.public.windowsxp.network_web)
  • Re: DBF File DELETED when PACK!?
    ... Are your files on the local machine or on the network somewhere? ... so you may be having network problems. ... >I found that VFP 6.0 would delete 'some' DBF files when PACK statement ...
    (microsoft.public.fox.vfp.reports.printing)
  • RE: Cannot connect to ANY network
    ... oh, and currently after a looong wait, i can see only the workgroup mshome ... I have run the network setup wizard many times both in this method ... > and even a few attempts after Service Pack Two. ... whether in my workgroup or not. ...
    (microsoft.public.windowsxp.network_web)
  • Re: Internet-da-guck-und-log-AppleScript?
    ... Verfügbarkeit prüft (ping?) und das Ergebnis (ja, nein, ggf. ... externe IP-Adresse) in ein log schreibt. ... Pack noch ein "do shell script" drum, wenn Du meinst, das muss sein. ... Carsten Blüm ...
    (de.comp.sys.mac.programmieren)