Re: [lwip-users] IPv6 porting, need help in netif->mld_mac_filter

[Zach Smith]

Manoj,

Sorry, I wasn't clear. You don't want to change your MAC address. Set your MAC 
address to your required address (38:60:77:4f:84:86) and leave it. But your 
actual hardware needs to be configured to receive multicast packets. I don't 
know what hardware you are using but usually they can be configured to 
automatically filter certain types of Ethernet packets. You might have it set 
to filter out multicast packets which may be why it is not working.

For example, I am using a STM32F2xx ARM processor. It has an integrated Media 
Access Controller (MAC) and I am using an external PHY. For IP4, you have to 
set up the MAC to receive broadcast frames because IP4 uses ARP for address 
resolution and ARP uses broadcast addressing. With just IP4 you don't 
necessarily need to receive multicast addresses so you can configure the MAC to 
filter those packets out so software doesn't have to deal with them.  But IP6 
uses multicast addressing to do the address resolution so you need to enable 
multicast reception in your MAC controller so they are not filtered out.

Like Ivan said though, in large networks that can be a lot of packets you are 
letting through. So another option is to set up your MAC controller to only 
receive packets destined for certain addresses. So in your case it might be 
enough to just make sure your MAC controller is receiving packets for your own 
MAC (38:60:77:4f:84:86); The all nodes MAC(33:33:00:00:00:01), and your 
"solicited node address" (33:33:ff:4f:84:86).  And of course broadcast 
(ff:ff:ff:ff:ff:ff) for IP4 stuff.

-Zach

-----Original Message-----
From: address@hidden [mailto:address@hidden On Behalf Of manswis
Sent: Monday, January 13, 2014 6:03 AM
To: address@hidden
Subject: Re: [lwip-users] IPv6 porting, need help in netif->mld_mac_filter

Ok, I understood what you are pointing to is my HW mac address not netif...
Once I change my MAC address to "33:33:00:00:00:01" I could get RA packet and 
IP assignment is working fine...

Now When I am pinging with asssigned IPaddress it failed to ping I could not 
receive any NS packet (in Wireshark I can see NS packet)...

Do I need to change my MAC again after RA to some other address??
Currently My MAC address (netif MAC) is 38:60:77:4f:84:86

Multicast address for NS packet is 33:33:4f:84:86 (received from pinging
machine)

My linklocal address is fe80::3a60:77ff:fe4f:8486



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