Missing sequence number

To detect the loss of an OLSR packet, section 14.3 of RFC3626 suggests checking packet sequence numbers. This is the sequence number of the generic OLSR packet header, not any of the message sequence numbers. To implement this, a node keeps track of the last received OLSR sequence number from all neighbor nodes. If an OLSR packet is received with a sequence number bigger than $last seqno + 1$ then the instability rule is applied.