Hi there,
I am using LWIP from the ESP-IDF (Espressif) but it doesn't seem to be
an ESP-IDF thing, so I am asking here. They're using LWIP from git
commit f79221431fa9042b3572d271d687de66da7560c4.
This is my situation. I have a client (running LWIP) configured with
IPv6 enabled and also autoconfigure (SLAAC) enabled.
The client is connected over wifi to a switch acting as IPv6 router,
connecting to other clients in other subnets and VRF's. The switch sends
router advertisements with the proper prefix configured, with a netmask
of /64 (which seems to be a requirement).
I have it working using SLAAC, no problem there. But I'd rather use a
static address and so I did. I was looking for a way to set the netmask
and the default gateway for this address but I found no way to do so,
there is just the address and that's it.
So I guessed the netmask and the default gw are taken from the router
advertisement packets. Ok, I get that, but I'd rather not have SLAAC at
all, so I configured only a static address and disabled router
advertisements from the switch. And indeed, no SLAAC address was
created, fine.
Now what puzzles me, is that I can still reach this client running LWIP
from a different subnet/vlan/broadcast domain. How can LWIP know what's
the netmask (i.e. what's local/non-local) for a global address and how
can LWIP know what address to use for the default gw, if no router
advertisements are used?
I need to know this, because probably some assumptions are made about
the network which may not be valid in my network.
Why can't I just configure a default gw and a netmask for a global
static interface address? Or even better, use the "token" concept as
found in the linux "ip" command, where a statically configured number is
used for lower 64 bits of SLAAC instead of the mac address. Shouldn't be
that hard to implement I think?
Thanks for your information!
Erik.
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