[lwip-devel] IPv6 gateway processing

[Erik Slagter]

Hi people,

Sorry to bother, but I have a question that has been on my mind for a 
long time and I can't find the answer from any documentation or the 
source itself.

How does LWIP find out what to do related to (default) gateway?

1) there is no way to install a default gateway
2) you can set a static address, but you cannot specify a netmask
3) it does seem to work, even without router advertisements

I'd gladly supply netmask and default gateway, but AFAIK there is no way 
to do it.

So when I e.g. send a UDP packet to some "global" type address, how does 
LWIP decide it's on the local subnet and request neighbour 
advertisements OR it's not on the local subnet and forward the packet to 
the default GW and where is that GW exactly?

It's even more interesting as in practice this works, sending non-local 
packets, but only after continuously sending packets for 30 seconds. 
After that, it keeps working. How does it know where to forward the 
packets to? And how kan I facilitate this process to work better?

Thanks!
Erik.