Re: [lwip-users] DHCP-Autoip cooperation

[ake . forslund]

Hi Simon,

I'm not sure I understand the code correctly
so I won't make any too big assumtions. Will the timer be set to last received
lease-time or will it be set to a lower value to make sure the dhcp-server
is found as soon as possible?

/Åke
-----------------------------
Åke Forslund
0433-273296
NIBE AB
Box 14
S-285 21  Markaryd
Tel +46-(0)433-273296

From:	"Simon Goldschmidt" <address@hidden>
To:	Mailing list for lwIP users <address@hidden>
Date:	2011-09-26 13:04
Subject:	Re: [lwip-users] DHCP-Autoip cooperation
Sent by:	address@hidden

---

address@hidden wrote:
> We are experiencing some trouble with some test setups regarding DHCP.
We 
> beleive that at some point the DHCP-renew of the lease fails and AUTO-IP
> kicks in. This is probably the intended behavour and is then working
fine.
> My question is how should this be handled by the system? I would like
to 
> get a new IP as soon as possible if the dhcp becomes available again.
Does
> LWIPs Auto-ip/DHCP cooperation handle this at all or is it up to me
to 
> detect that DHCP didn't manage to get an address and do periodic retries?

When renewing the lease fails, DHCP starts AutoIP. However, the dhcp timer
continues to run and once DHCP got a valid address again, it stops AutoIP
and switches to the DHCP address.

At least in our tests, this works fine (where we move between DHCP/AutoIP
networks or plug/unplug the uplink cable where the DHCP server is connected).

Simon
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