SCOUG-HELP Mailing List Archives

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Date:	Thu, 4 Oct 2001 23:00:37 PDT
From:	Peter Skye <pskye@peterskye.com >
Reply-To:	scoug-help@scoug.com
To:	scoug-help@scoug.com
Subject:	SCOUG-Help: Pinging

Content Type: text/plain

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Sheridan George wrote:
>
> why can I ping all URLs I tried but that one URL when
> my [other] machine says that same URL returns pings?

My best guess is that you have a firewall (maybe InJoy firewall?) and
somehow have the NTP (time) IP addresses blocked or your NAT (Network
Address Translation) isn't allowing the responses to get back to the
machine which originated them. Your message *seemed* to say that your
wife's machine's os2ntpd can ping *one* of the two ntp IP addresses but
not the other one, and that you can ping *both* of the IP addresses from
your own machine (yes?). If you post the two IP addresses I can check
them here.

Other possibilities that don't fit your scenario but I'll mention
anyway:

-- none of the time servers were "online" at the moment you turned on
the machine (this one might cause os2ntpd to not use them but wouldn't
cause the Ping problem you mentioned).

-- if you don't have os2ntpd's cfg_data file on your wife's machine then
os2ntpd.exe doesn't have the slightest idea where it's supposed to go to
get time information (but this has nothing to do with the Pings).

Ping isn't a server. It's the result of sending small ICMP messages to
an IP address. The IP *stack* (no server necessary) on the foreign
machine responds to them.

Thus, if you ping *any* machine that's currently connected to the net
you should get a response, even if they aren't running a server. Ping
simply says "there's a machine here with an active IP stack".

os2ntpd.exe uses a list of time servers stored in a file named cfg_data
(it's probably in the same directory as the program). You can add more
time servers to the list if you want, and remove the ones that are no
longer working. There should be an os2_ntpd.man text file in your
original .zip file which explains this and some other stuff, but this
has nothing to do with Ping either, it's just hard to keep me quiet once
I get started.

- Peter

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