Re: [lwip-users] Ping zero checksum, hostname

[Oliver Schindler]

Hi Mark,

On 30.09.2015 00:24, Mark Lederman wrote:

Hello:

I’m using lwip 1.4.1 with a TI eval board. When I ping the board I get an echo response however the checksum value is zero. On the pc side I get the message “request timed out”. Using a network analyzer and pinging anything else on the network the checksum is not zero. When stepping through the lwip code it does appear to generate a checksum but apparently it’s not transmitted? I’ve tried setting many options but no joy. Do you have any suggestions? It appears the problem I’m having could be the same as another user describes on an ST board.  

http://lists.nongnu.org/archive/html/lwip-users/2013-07/msg00053.html

Part Two: I’d like to be able to ping using the hostname. I enabled DNS and NETIF_HOSTNAME as others have suggested but when I ping the default hostname “lwip” I get the response “Ping request couldn’t find host lwip”. Any suggestions? Ultimately I’d like to be able to enter the hostname in a browser to access the web server. To get the browser working with hostname do I need to implement mDNS (Bonjour protocol) for users on Apple devices and LLMNR for Windows users or is being able to ping using the hostname enough to have it work in the browser?  

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Quite a while ago i faced the same problem, when i tried to ping my system from windows. So i implemented the "NetBios-NameService" for
LWIP as a responder for the Windows NetBiosCalls. I didn't checked if this fits to an actual version of LWIP, but maybe it might help you as a jumpstart.

Best regards,
Oliver



-------- Forwarded Message --------

Subject:	[lwip-users] Netbios nameresolving for lwip
Date:	Sat, 06 Dec 2008 22:34:39 +0100
From:	Oliver Schindler <address@hidden>
Reply-To:	Mailing list for lwIP users <address@hidden>
To:	Mailing list for lwIP users <address@hidden>

Hi there,
i'm quite new in this list, so didn't know, if this topic was handled 
before ...
.. anyway, I'm using the lwip on an Arm9 together with FreeRtos and it's 
working
smooth  like anything. There was only one little naggi thing for me, 
because the counterpart of my
SW is hosted in the windows-world, and this speaks only netbios for 
nameresolving.
 I'm in the need of using DHCP, so there is no chance to contact my 
Arm-board through a
static IP. To keep long terms short, i wrote a little piece of SW which 
does the name-resolving
for a netbios-name request and sends back the current IP-Adress.
Maybe it's of any use for someone ... If the maintainer of the lwip find it
somehow usefull, it can also be a part of the lwip.  It consists of a  
c- and h -file and a part for  the
lwip-opts.
The init is quite simple, jut give a pointer of your host-name, and 
pointer for the namelength and a
pointer for your networkinterface. The last one is needed to get the 
IP-adress for the interface, so
this will work also in cooperation with DHCP. The maximumlength for the 
hostname is 32 chars, this
is the restriction from netbios.

Thanks for your great work and c.u. soon,
Oliver

opt_part.h
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nbns.h
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nbns.c
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