Re: [lwip-users] lwip not working with Linksys switch?

[Xia, Fei]

Thanks guys. You are right. After I set the MAC address according to standard 
MAC group address convention, the problem is resolved.

Best regards,
Xia

-----Original Message-----
From: address@hidden [mailto:address@hidden On Behalf Of Joe Bloggs84
Sent: Thursday, March 15, 2012 7:03 PM
To: Mailing list for lwIP users
Subject: Re: [lwip-users] lwip not working with Linksys switch?

This is good advice.  If your MAC address doesn't conform to some rules some 
systems will not pass the packets and/or some DHCP servers will refuse to 
allocate an IP address.

If you want to create your own MAC address for testing then you might consider 
using a  "locally administered address" - basically make sure the first octet 
has bit 0 = 0 and bit 1 = 1, or easy to just choose 0x02 as the first octet of 
the MAC.

The following IEEE pdf has details but be careful of the bit ordering in the 
document (they are shown with the LS bit on the left of the octet when 
displaying the binary representation):
http://standards.ieee.org/develop/regauth/tut/macgrp.pdf

Bye for now,
Ian

On 15/03/2012 8:49 PM, Oane Kingma wrote:
> One thing I found when I was implementing lwIP was that my HP Procurve 
> switch didn't like my test '01:23:45:67:89:AB' MAC address very much.
> It dropped all packets originating from that MAC address...
>
> Best regards,
> Oane
>
> On 15-3-2012 10:35, twenty wrote:
>> Hi All,
>>
>> I implemented lwip in ADI BF527 DSP on a customized board. The 
>> Ethernet communication is fine between the board and the PC. However, 
>> if i connect the board and pc via a linksys switch, there is no 
>> communication at all. I am sure there is no physical connection 
>> problem.  i suspect it might be related to lwip stack as the old 
>> platform which used KwikNet TCP/IP Stack from Kadak didn't have this 
>> issue. Do you guys have any idea on that?
>> Thanks.
>>
>> Best regards,
>> Xia
>

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