Re: [lwip-users] autoip usage

[vincent cui]

Using LWIP_DHCP_AUTOIP_COOP, it still works when cable is unplugged into , 
right ?


Vincent Cui
Sr. Firmware Engineer
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Shanghai EnLogic Electric Technology Co., Ltd.
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-----Original Message-----
From: address@hidden [mailto:address@hidden On Behalf Of Simon Goldschmidt
Sent: 2011年12月5日 21:26
To: Mailing list for lwIP users
Subject: Re: [lwip-users] autoip usage

vincent cui <address@hidden> wrote:
> so I could start autoIP at once after DHCP cann't get a
> valid address... in this case.
> LWIP_DHCP_AUTOIP_COOP still work ?

No, with LWIP_DHCP_AUTOIP_COOP enabled, you MUST NOT call autoip_start() 
yourself! Only the dhcp code may call this or else the AutoIP state machine 
might get out of sync.

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

Yes, just change the define LWIP_DHCP_AUTOIP_COOP_TRIES from its default value 
of 9. LWIP_DHCP_AUTOIP_COOP_TRIES is the number of DHCP-discover retries that 
have to fail before changing to AutoIP mode (which is why I don't remember the 
default time here - dhcp retries use an exponential backoff for the timeout...).

Simon
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