RE : RE : [lwip-users] Broadcast packets breaking my network traffic

[Frédéric BERNON]

>Yes in my port it's enabled. Should I disable it?

It can be useful. Simon just fix it in current CVS HEAD, but since you use lwip 
1.1.0, I think you could have the problem

>I'm thinking if I should remove this or not... 

That's what we do now (There is an option for that). But in fact, even ARP 
packets can cause the problem. That's why, in current code, all packets are 
process in a "core protection" context (when you use tcpip.c).


>I've read one of your posts about this issue on the list. ( December 2006, I 
>guess). When do you think this will cause problems to me? For example, if I 
>disable etharp_ip_input before calling tcp_output and re-enable it after 
>tcp_sent, is it an enough protection? I really don't care answering arp 
>requests for a short period of time as long as it is not a very very wrong 
>move.

I don't know how is your application design, but saying you have two contexts: 
one for your RX (your driver), and one for your application which send the 
data. If your application send data, and there is a switch context (note that 
sys_arch_protect only protect small parts of the code, like allocation, etc..), 
and you start to process any input packet, you can corrupt the core. But how do 
the "right" protection is dependant of your driver, your port, and your 
application.

But even with all that, what it is really strange, is that all your boards hang 
at the same time...

Do you have provide a capture file ?
  
====================================
Frédéric BERNON 
HYMATOM SA 
Chef de projet informatique 
Microsoft Certified Professional 
Tél. : +33 (0)4-67-87-61-10 
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Email : address@hidden 
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P Avant d'imprimer, penser à l'environnement
 


-----Message d'origine-----
De : address@hidden [mailto:address@hidden De la part de Caglar Akyuz
Envoyé : jeudi 19 juillet 2007 18:04
À : Mailing list for lwIP users
Objet : Re: RE : [lwip-users] Broadcast packets breaking my network traffic


Frédéric BERNON wrote:
> Perhaps some ideas:
> 
> - Windows talk "everywhere", understand : it send lot of packets for 
> ARP, uPnp, Netbios, etc... More than Linux on this point.
> - If you use a hub, and not a switch, you can have "lot" of collisions on the 
> network. What is the result on a switch?
> - Do you use ARP_QUEUEING? There was a problem with this option in previous 
> releases.

Yes in my port it's enabled. Should I disable it?

> - Does your ethernet driver call directly etharp_ip_input on receive? 
> This could cause problems inside ARP table (concurrent access not 
> protected), and "load" your target if you receive lot of packets...
>

Actually yes it is. However, I tried disabling it in my port while I'm in the 
process of transmitting. I have not seen any enhancement. I'm thinking if I 
should remove this or not...

I've read one of your posts about this issue on the list. ( December 2006, I 
guess). When do you think this will cause problems to me? For example, if I 
disable etharp_ip_input before calling tcp_output and re-enable it after 
tcp_sent, is it an enough protection? I really don't care answering arp 
requests for a short period of time as long as it is not a very very wrong move.

Caglar


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