Re: [lwip-users] autoip usage

[vincent cui]

Simon:

In my code,,, I check the failure of DHCP getting valid address by trying to 
check the IP address allocated, if try times is great than the 20, the DHCP 
doesn't get a valid address.

You said that "autoIP is started when DHCP does not get an address after ~30-40 
seconds",,, so I could start autoIP at once after DHCP cann't get a valid 
address... in this case.
LWIP_DHCP_AUTOIP_COOP still work ?

In actually, 30 ~40 seconds is too long to me ? could I modify it ?

Vincent Cui
Sr. Firmware Engineer
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-----Original Message-----
From: address@hidden [mailto:address@hidden On Behalf Of Simon Goldschmidt
Sent: 2011年12月5日 20:34
To: Mailing list for lwIP users
Subject: Re: [lwip-users] autoip usage

vincent cui <address@hidden> wrote:
> I am gonna to enable AUTOIP when DHCP detection fail after trying some
> times.

LWIP_DHCP_AUTOIP_COOP does this for you. When LWIP_DHCP_AUTOIP_COOP==1, 
LWIP_DHCP==1 and LWIP_AUTOIP==1, autoIP is started when DHCP does not get an 
address after ~30-40 seconds. DHCP is still continued in the background then 
(with increased retry-delays), so if you plug in a DHCP server later, it will 
switch back to DHCP. Also this sequence is restarted when the link status goes 
back to 'up'.

Simon
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