Re: [IPv6 Users] Multicast Loopback on DAD

Suresh wrote:
> Hi,
> 
> I have doubt on the Multicast Loopback handling on DAD.
> Does Linux-IPv6 confirm "9.  APPENDIX A: LOOPBACK SUPPRESSION &
> DUPLICATE ADDRESS DETECTION" of RFC2462 ? According to the following
> code, DAD will not work where two interfaces are using the same
> link-layer address, since it simply discards the packet from other node
> also. Am I right?
> 
> 
>                          if (dev->type == ARPHRD_IEEE802_TR) {
>                                  unsigned char *sadr = skb->mac.raw;
>                                  if (((sadr[8] ^ dev->dev_addr[0]) &
> 0x7f) == 0 &&
>                                      sadr[9] == dev->dev_addr[1] &&
>                                      sadr[10] == dev->dev_addr[2] &&
>                                      sadr[11] == dev->dev_addr[3] &&
>                                      sadr[12] == dev->dev_addr[4] &&
>                                      sadr[13] == dev->dev_addr[5]) {
>                                          /* looped-back to us */
>                                          goto out;
>                                  }

This will only be evaluated on Token Ring devices.

-vlad
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