Subject: [Roll] Questions about DAG inconsistency in RFC 6553

From: Anthea Mayzaud <[email-masked]>
Date: Fri, 23 Aug 2013 16:33:24 +0200 (CEST)

Dear all, 

The RFC 6553 proposes to mitigate DAG and DAO inconsistency attacks. The spec is not so clear and I have some questions about it. 

First, why is the proposed threshold 20? 

Second, it says that 
" an implementation MAY limit the rate of Trickle timer resets caused by receiving a RPL Option to no greater than MAX_RPL_OPTION_RANK_ERRORS per hour." 
It is not so clear, should we understand that after receiving 20 messages with R-bit set, the node does not trigger the reset of trickle timer but still drops the messages? 

Thank you in advance, 

Anthéa Mayzaud