ping questions

Robert Heller heller at deepsoft.com
Tue Dec 22 14:24:58 UTC 2015


At Tue, 22 Dec 2015 09:49:26 +0100 "Ubuntu user technical support,  not for general discussions" <ubuntu-users at lists.ubuntu.com> wrote:

> 
> 
> 
> ---Executing: recode
> On 22.12.2015 09:42, Crispin Wellington wrote:
> > You pinging the live IP?
> yes
> >
> > Maybe your ISP or your modem blocks ICMP ECHO?
> but why does ping work when I am logged in "behind" the modem?
> it is still the same IP.

It is on the *other* side of the firewall.  Imagine if you will a one-way 
mirror.  From one side it is a mirror, from the other side it is a window... 
Something like that is going on.

> robert
> 
> >
> > Crispin
> >
> > On Tue, Dec 22, 2015 at 4:39 PM, robert <robert at redcor.ch 
> > <mailto:robert at redcor.ch>> wrote:
> >
> >     Hi there,
> >
> >
> >     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?
> >
> >     thanks for your info
> >     robert
> >
> >
> >     --
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> >
> >
> >
> >
> 
> 
> 
> begin:vcard
> fn:robert rottermann
> n:rottermann;robert
> email;internet:robert at redcor.ch
> tel;work:+41 31 333 10 20
> x-mozilla-html:TRUE
> version:2.1
> end:vcard
> 
> 
> MIME-Version: 1.0
> 

-- 
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