kauer at biplane.com.au
Tue Dec 22 10:56:57 UTC 2015
On Tue, 2015-12-22 at 09:39 +0100, robert wrote:
> At work I have an internet connection with a static IP. A Zyxel isdn
> modem is connected to it. Trying to ping that IP from outside fails (100% loss).
> When I am logged in a pc in a private network behind the modem, I can
> ping the that same IP without loss.
> Why is that so?
It sounds a bit as if you have a PPPoE client running on your PC
handling the connection, and the "modem" really is a modem - not a
You can find out pretty quickly. Run this command in a terminal window:
ifconfig | grep "a.b.c.d"
... where a.b.c.d is your static IP address.
If you see any output from that command, then your PC, and not the
modem, is handling the connection.
You said you have a "private network behind the modem". Do you have more
than one device (PC, printer, whatever) in that network?
Karl Auer (kauer at biplane.com.au)
GPG fingerprint: 3C41 82BE A9E7 99A1 B931 5AE7 7638 0147 2C3C 2AC4
Old fingerprint: EC67 61E2 C2F6 EB55 884B E129 072B 0AF0 72AA 9882
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