ecurity=20 reasons): OSPF: Bad packet from 10.1.2.3 - authentication failed As the LOG messages increases, we try to debug this and enable=20 debug protocols { packets } so we see this as the case of the LOG messages: 2014-03-07 10:59:20 <TRACE> aclctrans: OSPF_auth: lower sequence number= (rcv=20 13229786, old 13229787) 2014-03-07 10:59:20 <ERR> OSPF: Bad packet from 10.1.2.3 - authenticati= on=20 failed 2014-03-07 10:59:20 <TRACE> aclctrans: OSPF_auth: lower sequence number= (rcv=20 13229786, old 13229787) 2014-03-07 10:59:20 <ERR> OSPF: Bad packet from 10.1.2.3 - authenticati= on=20 failed 2014-03-07 10:59:20 <TRACE> aclctrans: OSPF_auth: lower sequence number= (rcv=20 13229786, old 13229787) 2014-03-07 10:59:20 <ERR> OSPF: Bad packet from 10.1.2.3 - authenticati= on=20 failed 2014-03-07 10:59:20 <TRACE> aclctrans: OSPF_auth: lower sequence number= (rcv=20 13229786, old 13229787) 2014-03-07 10:59:20 <ERR> OSPF: Bad packet from 10.1.2.3 - authenticati= on=20 failed 2014-03-07 10:59:20 <TRACE> aclctrans: OSPF_auth: lower sequence number= (rcv=20 13229786, old 13229787) 2014-03-07 10:59:20 <ERR> OSPF: Bad packet from 10.1.2.3 - authenticati= on=20 failed 2014-03-07 10:59:20 <TRACE> aclctrans: OSPF_auth: lower sequence number= (rcv=20 13229786, old 13229787) 2014-03-07 10:59:20 <ERR> OSPF: Bad packet from 10.1.2.3 - authenticati= on=20 failed We do not have any clue about where the decremented sequence number cam= e from. As this is an internal network and we have an helo interval of 5 second= we can=20 not imagin that this could be an "late" or "old" paket. At the Moment we use mainly bird 1.3.11 with some exceptions where we h= ave=20 bird 1.4.0. The problem seems not only bird generated as we also have f= rom IPs=20 which are router in our network. --=20 Mit freundlichen Gr=FC=DFen --------------------------------- Daniel Wendler