Re: [lwip-users] Problem using 2 Netifs

[Fred39]

Ok i found the problem, both netifs had similar ip configuration "same
subnet" which was the problem thus the packets where send to the first netif
in the list :)

Is this behaviour specified somewhere ? 
Regards


Fred39 wrote:
> 
> Hi LWIP Users,
> 
> I am currently working on a device which has two network interfaces. One
> from the uC and one over USB which is a virtual network device. My Lwip
> Version is 1.1.1 i know its old but i am not allowed to change it. Could
> lwip make problems when 2 netifs are registred? I set my uC netif as
> default because it uses dhcp/static ip for that i use the global
> netif_default for it. The virtual netif has a static ip.
> My Pseudo code looks like this:
> 
> 1.    init_lwip
> 2.    HW init uC
> 3.    netif_add(uCnetif,tcpip_input)
> 4.    HW_init virtual device
> 5.    netif_add(virtualnetif,tcpip_input) 
> 
> In the global variable netif_list is see both of the netifs with correct
> settings. I only set the uC netif as default, because for this i use
> different protocol for IP address (DHCP or static) and i set IP through my
> application thread in a thread save way :) 
> 
> I am now facing a problem that my upperlayer tasks using tcp or udp are
> not working when both interfaces are added. If only the uC netif is
> initialized it works. 
> When 2 netifs over Wireshark is see that data is send to my device but i
> get a SACK_PERM=1, the device is not recveiving the data.
> Is this phenomen familiar to somebody? Should it be possible to use 2
> netifs in the old lwip 1.1.1 ? 
> 
> Where could i start searching for the problem.
> 
> Regards
> 

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