Disconnection issues after long periods of inactivity

[Dan Williams]

On Mon, 2016-05-02 at 10:43 +0200, José  wrote:
> Hi,
> 
> this is an issue I am currently having on a Android system using the
> manufacturer RIL, and although I have also seen it using linux and
> modemmanger, is more of a general cellular network question.
> 
> When being inactive for a long period (~24 hours) seems like the
> connection goes down. The connectivity seems lost (trying to load a
> webpage of ping a domain fails) but the modem seems active and
> connected. In this state, when pinging directly to an IP I get
> outputs
> similar to the following:
> 
> PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
> 
> From 100.82.203.31: icmp_seq=1 Destination Host Unreachable
> 
> --- 8.8.8.8 ping statistics ---
> 
> 1 packets transmitted, 0 received, +1 errors, 100% packet loss, time
> 0ms
> 
> Can any of you explain what exactly happens? Thanks

What kind of modem is this, and is it PPP-based?

Dan