Re: [lwip-users] lwip 1.3 UDP - DNS strange behaviour

[Rejean Groleau]

Hi Sergio,

I had the same problem a while back. My problem was two-fold:

First, I did not have enough pbufs (PBUF_POOL_SIZE and MEMP_NUM_PBUF)
to do everything I was doing at startup. Once I got the LWIP_DEBUGF
and LWIP_PLATFORM_DIAG macros properly implemented, I was able to see
the errors coming from the dns_send() function.

Then, I was not waiting for the interface to be up and initialized before
calling dns_gethostbyname(). This was solved by calling netif_is_up().

Tell me if this was any help at all,

-Reggie.


Sergio Sider wrote:
> 
> The call to dns_gethostbyname returns
> with ERR_INPROGRESS as expected, but the query packets are not sent and
> the
> callback function is never called, even after the timeouts... (everything
> else works, I can ping the interface, webserver is working, and so on). I
> noticed it only occurs if I call dns_gethostbyname right after
> initializing
> lwip (using fixed IP). If I use DHCP or I wait a few seconds after I set
> the
> static IP, it works sometimes.
> 

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