RE: [lwip-users] fixed IP and DCHP on the same net interface?

[Muhamad Ikhwan Ismail]

Hi,

I have this too, you can do this by writing into the netif ip address directly before starting dhcp (dhcp_start).
There is a bit of problem though, if the DHCP server offers an address equals to the static address and ,
and after offering does acheck through ARP, your device will answer and the
DHCP will fail..

Ikhwan

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Date: Tue, 16 Dec 2008 10:10:11 +0100
From: address@hidden
To: address@hidden
Subject: [lwip-users] fixed IP and DCHP on the same net interface?

Hi all

I tested a network camera, which seems work in this way:

it has a DHCP client inside, which starts on power on. But until an IP from DHCP server is available, it answers on fixed ip (i.e. 192.168.1.3)

Can i do the same using lwip?

I tried to bring up an interface with fixed IP and after start DHCP, but it doesn't work: i didn't receive a new ip address from DHCP server.

I saw DHCP traffic using wireshark: in normal situation, DHCP client sends packet from 0.0.0.0 to broadcast, and the server answers, in my situation i have DHCP request from 192.168.1.3 to broadcast...

i suppose this could be the problem

Any idea??

Thanks,

Piero

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