Re: [lwip-users] LWIP problems

[Terry Barnaby]

Hi,

We did see an issue like this on one of our LWIP systems. Our system's 
networking was going very slow on a customers site.


In our case it was due to the customers network having a lot of video 
multicast packets and a simplistic LWIP Ethernet driver. The LWIP 
Ethernet driver was enabling the use of multicast packets (which we were 
using for auto discovery), but it did so by allowing any packet through 
for LWIP processing.
We fixed this by modifying the LWIP Ethernet driver to only allow the 
particular multicast packets through (appropriate IP address).


Terry
On 15/06/2020 18:30, Trampas Stern wrote:
I can not access the customer network to root cause so I am working on 
modifying LWIP to get some stats on the various packet types to see if 
the issue is the broadcast messages, or something else.


I just find that LWIP code so confusing it takes me forever to figure 
out the N layers of abstraction and such to understand what is going on.


Trampas

On Mon, Jun 15, 2020 at 1:18 PM Stephen Cowell 
mailto:s.cow...@plasmability.com>> wrote:


We have asked customers to reduce the mask and create a smaller
subnet... this has worked for us.
-- 


Stephen Cowell
Project Manager/Engineer
Plasmability LLC
Office (512) 267-7087
Cell  (512) 632-8593
www.plasmability.com  

On 6/15/2020 11:05 AM, Trampas Stern wrote:

We finally shipped the product using LWIP and now customers are
complaining that the network interface is not working properly on
their network. They can not load webpages as it appears too slow
of a connection.

The only thing I can figure out is they have enough broadcast and
ARP packages that it overwhelms our ability in LWIP to handle the
messages but I am not sure.

Has anyone encountered these problems before?

Thanks
Trampas

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--
Dr Terry BarnabyBEAM Ltd
Phone: +44 1454 324512  Northavon Business Center,
Email: te...@beam.ltd.ukDean Rd, Yate
Web: www.beam.ltd.ukBristol, BS37 5NH, UK
BEAM Engineering: Instrumentation, Electronics/Software/Systems

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Re: [lwip-users] LWIP problems

[Trampas Stern]

I can not access the customer network to root cause so I am working on
modifying LWIP to get some stats on the various packet types to see if the
issue is the broadcast messages, or something else.

I just find that LWIP code so confusing it takes me forever to figure out
the N layers of abstraction and such to understand what is going on.

Trampas

On Mon, Jun 15, 2020 at 1:18 PM Stephen Cowell 
wrote:

> We have asked customers to reduce the mask and create a smaller subnet...
> this has worked for us.
> --
>
> Stephen Cowell
> Project Manager/Engineer
> Plasmability LLC
> Office (512) 267-7087
> Cell  (512) 632-8593www.plasmability.com
>
> On 6/15/2020 11:05 AM, Trampas Stern wrote:
>
> We finally shipped the product using LWIP and now customers are
> complaining that the network interface is not working properly on their
> network.  They can not load webpages as it appears too slow of a
> connection.
>
> The only thing I can figure out is they have enough broadcast and ARP
> packages that it overwhelms our ability in LWIP to handle the messages but
> I am not sure.
>
> Has anyone encountered these problems before?
>
> Thanks
> Trampas
>
> ___
> lwip-users mailing 
> listlwip-users@nongnu.orghttps://lists.nongnu.org/mailman/listinfo/lwip-users
>
>
>
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Re: [lwip-users] LWIP problems

[Stephen Cowell]

We have asked customers to reduce the mask and create a smaller 
subnet... this has worked for us.

--

Stephen Cowell
Project Manager/Engineer
Plasmability LLC
Office (512) 267-7087
Cell  (512) 632-8593
www.plasmability.com

On 6/15/2020 11:05 AM, Trampas Stern wrote:
We finally shipped the product using LWIP and now customers are 
complaining that the network interface is not working properly on 
their network.  They can not load webpages as it appears too slow of a 
connection.


The only thing I can figure out is they have enough broadcast and ARP 
packages that it overwhelms our ability in LWIP to handle the messages 
but I am not sure.


Has anyone encountered these problems before?

Thanks
Trampas

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Re: [lwip-users] LWIP problems

[Trampas Stern]

The MAC address is unique unless someone copied our company MAC range.

On Mon, Jun 15, 2020 at 12:48 PM yasir arafat 
wrote:

> I would suggest to check if MAC ID is unique. One of main reason behind
> slow network network interface in my case.
>
> On Mon, 15 Jun, 2020, 9:36 pm Trampas Stern,  wrote:
>
>> We finally shipped the product using LWIP and now customers are
>> complaining that the network interface is not working properly on their
>> network.  They can not load webpages as it appears too slow of a
>> connection.
>>
>> The only thing I can figure out is they have enough broadcast and ARP
>> packages that it overwhelms our ability in LWIP to handle the messages but
>> I am not sure.
>>
>> Has anyone encountered these problems before?
>>
>> Thanks
>> Trampas
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Re: [lwip-users] LWIP problems

[yasir arafat]

I would suggest to check if MAC ID is unique. One of main reason behind
slow network network interface in my case.

On Mon, 15 Jun, 2020, 9:36 pm Trampas Stern,  wrote:

> We finally shipped the product using LWIP and now customers are
> complaining that the network interface is not working properly on their
> network.  They can not load webpages as it appears too slow of a
> connection.
>
> The only thing I can figure out is they have enough broadcast and ARP
> packages that it overwhelms our ability in LWIP to handle the messages but
> I am not sure.
>
> Has anyone encountered these problems before?
>
> Thanks
> Trampas
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[lwip-users] LWIP problems

[Trampas Stern]

We finally shipped the product using LWIP and now customers are complaining
that the network interface is not working properly on their network.  They
can not load webpages as it appears too slow of a connection.

The only thing I can figure out is they have enough broadcast and ARP
packages that it overwhelms our ability in LWIP to handle the messages but
I am not sure.

Has anyone encountered these problems before?

Thanks
Trampas
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