Re: [lwip-users] why the board sends Gratuitous ARP always?

[fangcheng_gmail]

Hi,

I'm sorry I didn't describe the problem clearly.

There are two conditions (the target board is connected to one PC with
Ethernet, Wirshark and NetAssist are ran
on the PC side):

(1) if I use the debug tool (Lauterbach Trace32), connect the debug tool to
the target board, download the program through it, 
and then run the program,the gratuitous arp message is only sent less than
five times (captured by Wirshark). 
Everything goes well.

(2)but if I run the program without debug tool, for example, disconnect the
debug tool and power on
the target board, this arp message is sent one by one without stop.  The
problem comes, the board 
can't receive the message from the software NetAssist on the PC side any
more. The network traffic is 
congested with this such message.


Best 

Cheng Fang


----------------------------------------------------------------------------
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------------
Gratuitous ARP is a good thing, it tells the router and all other equipment
what is your IP...

I had a lot of trouble to activate it in another stack ;-)

Alain

----------------------------------------------------------------------------
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------------Hi,

nothing is wrong. See
Request for Comments: 5227
http://tools.ietf.org/search/rfc5227

2.1.  Probing an Address

Best
Martin


On Sun, Jan 26, 2014 at 3:55 AM, fangcheng_gmail <address@hidden>
wrote:
>
> I'm try to implement LWIP on a board based on the MCU MPC5604E from 
> Freescale.
>
> I set the IPv4 address to 169.254.1.60 manually (not by DHCP or 
> AUTOIP), the board direct connects to one PC with IP address 
> 169.254.1.20. (Network gateway is 169.254.1.1)
>
> After each power on reset, the boards always sends gratuitous ARP 
> continuously.
>
> The attached picture shows this condition.
>
> What's wrong?
>
>
> Best regards,
>
> Cheng Fang
>
>
> _______________________________________________
> lwip-users mailing list
> address@hidden
> https://lists.nongnu.org/mailman/listinfo/lwip-users

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