Mailinglist Archive: opensuse (3336 mails)

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Re: [SLE] SuSE/Linux Ping vs DOS Ping
  • From: Simon Roberts <thorpflyer@xxxxxxxxx>
  • Date: Thu, 1 Dec 2005 09:31:43 -0800 (PST)
  • Message-id: <20051201173143.57343.qmail@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
Use ethereal to look at the packets. Indeed, use ethereal to see if the
ping is actually leaving the SuSE box; perhaps it has a freak
misconfiguration you've overlooked?

BTW, don't forget that ethereal snoops ports, so if you see something
come into your machine you're seeing it before the firewall gets at it.
So if you see a ping response in ethereal but you don't see it, then
the firewall probably killed it.


--- David McMillan <skyefire@xxxxxxxxxxxx> wrote:

> G'day, fellow SuSE users. I've got a puzzler concerning ping
> responses that I hope someone can enlighten me about.
> I have a piece of industrial equipment that uses a TCP/IP Ethernet
> interface that I'm trying to troubleshoot at work. Part of the
> manufacturer's troubleshooting checklist is to "connect an
> DOS/Windows
> computer and use the PING command from the command line." Not having
> a D/W computer handy, I plugged in my SuSE 9.1 Pro laptop, but
> couldn't get a response. Not even a "connection refused," just
> silence.
> After some fairly exhaustive troubleshooting, this is what we found:
> 1: A DOS ping command, from another computer, using the same IP and
> netmask, over the same cable, got an immediate response.
> 2: The SuSE machine could not get a ping response, but *did* see
> the
> various open and filtered ports on the inustrial box, on the correct
> IP, when using nmap.
> 3: De/Re-activating SuSE Firewall made no difference.
> 4: The SuSE machine's ping command worked perfectly on a regular
> network, pinging Windows & *nix computers and various hardware
> routers
> without any difficulty.
> All I can think of is that there must be some minor difference
> between SuSE pings (or perhaps Linux pings in general) and DOS/Win
> pings that doesn't matter to most networks, but *does* matter for
> some
> reason to this piece of industrial hardware.
> Thoughts?
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