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RE: [lwip-users] Fixed and dynamic IP simultaneously

From: Kindt, Jan
Subject: RE: [lwip-users] Fixed and dynamic IP simultaneously
Date: Thu, 30 Mar 2006 21:35:30 +0200

Hi Leon,

Sorry for the late answer, but I received this message on 28/03/2006
00:08. I wonder if this latency is caused by our receiving mailserver or
by the list.

In the meantime, my system is running lwIP-1.1.0. I got the stack up and
running without too much hassle.

I wonder if I could get away with adding the same Ethernet adapter twice
to the list of devices.

Best regards,

-----Original Message-----
From: address@hidden
[mailto:address@hidden] On Behalf Of
Leon Woestenberg
Sent: dinsdag 21 maart 2006 2:46
To: Mailing list for lwIP users
Subject: Re: [lwip-users] Fixed and dynamic IP simultaneously

Hello Jan,

Kindt, Jan wrote:
> Is it possible to have the one ethernet controller have a fixed and a
> dynamic IP address. I'm running lwIP-0.7.1.
> I started with this : (with ipaddr, netmask & gw set to 0)
> lwip_init();
> netif_add(&netif, &ipaddr, &netmask, &gw, (*void**)dev_list_ptr,
> lan91c111if_init, ip_input);
> dhcp_start(&netif);
> netif_set_default(&netif);
> This gives me an ip address from my dhcp server. I get ping replies
> from my device.
> Then I added following lines.. (with ipaddr, netmast & gw set to the
> fixed addresses I want)
> netif_add(&netif, &ipaddr, &netmask, &gw, (*void**)dev_list_ptr,
> lan91c111if_init, ip_input);
> The DHCP client that was started is now unable to get a dynamic
> address and the fixed address doesn't function also.
> I'm sure that I'm doing things wrong. I just would like to have a
> pointer to where to search for a solution.

First of all 0.7.1 is reasonable old.

You are trying to create two Ethernet interfaces on one Ethernet device,

right? This is not supported by lwIP, although it should be easy to add
this functionality.


Leon Woestenberg.

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