Re: [lwip-users] Losing connection with router

[Sergio R. Caprile]

I don't understand what you say, routers do not "recognize devices",
they resolve IP addresses to MAC addresses via ARP like any other host
in a network and route IP datagrams based on IP addresses.

If you can ping your lwIP device, then it is probably alive.
If the router does not show it in "the list of connected hosts", then
you have to understand what that "list of connected hosts" is and what
is the merit of one to get to that honour, because your device is
probably not up to it. Your router is quite likely more than a router
and you are not paying attention to a requirement for connectivity.

Please (indeed), do yourself a favour and capture the network traffic,
so you can see why you lose your connection; and learn about that router.
You'll be able to see DHCP lease times, renewals, and all that stuff
while looking at the capture file. It is a bit of more use than guessing
in the dark.

You'll need a hub, or a switch with "monitor mode" to capture both lwIP
device and router traffic in that network. See this:
https://wiki.wireshark.org/CaptureSetup/Ethernet

If the RBPI works OK, and you can't get info on the router, then leave
the RBPI running and capture its traffic too.
If you are planning to post that capture file later, please be nice and
set a small network aside with a switch so we don't get to see the whole
network traffic...