Re: [lwip-users] IP6 address autoconfig problem when using hub

[Zach Smith]

Thanks for the responses.

I kept my old hub around because it is handy to have for viewing network 
traffic.  I connect my PC and other network devices to it and I can then use my 
PC to snoop on communications between the other devices.

-Zach


-----Original Message-----
From: address@hidden [mailto:address@hidden On Behalf Of Ivan Delamer
Sent: Monday, December 10, 2012 9:59 AM
To: address@hidden
Subject: Re: [lwip-users] IP6 address autoconfig problem when using hub

I agree 100% with Simon, I think you will see problems with other protocols as 
well. I would filter out packets with your MAC address at the MAC layer 
implementation (ethernet_if).

Cheers
Ivan


> Date: Sun, 9 Dec 2012 10:53:58 +0100
> From: Simon Goldschmidt <address@hidden>
> To: Mailing list for lwIP users <address@hidden>
> Subject: Re: [lwip-users] IP6 address autoconfig problem when using
>       hub
> Message-ID: <address@hidden>
> Content-Type: text/plain; charset="us-ascii"
>
> Zach Smith wrote:
>
>> I am having a problem when I connect my IPv6 device running lwip to a 
>> hub instead of a switch.
>> [..]
>> Since a hub forwards all packets received onto all ports it is 
>> echoing my devices neighbor discovery messages back.
>
>
> I haven't had the chance to test lwIP on a hub, yet (we only have 
> switches, all hubs were thrown away a long time ago...). However, if 
> your hub really sends back all your frames, I guess IPv6 autoconfig 
> will not be the only protocol having problems.
>
> I think filtering out these packets in ethernetif_input as you 
> suggested is the best solution.
>
> Simon



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