duvidas de mensagem de erroo

jan/27/2010 12:33:05 system,error,critical login failure for user mkauth from 189.112.51.241 via ssh
jan/27/2010 12:33:05 system,error,critical login failure for user mkauth from 189.112.51.241 via ssh
jan/27/2010 12:33:05 system,error,critical login failure for user mkauth from 189.112.51.241 via ssh
jan/27/2010 12:33:05 system,error,critical login failure for user mkauth from 189.112.51.241 via ssh
jan/27/2010 12:36:09 system,error,critical login failure for user mkauth from 189.112.51.241 via ssh


e oque é issu ?? quer dizer que o cara nao ta na lista!!!

system error critical  login failure for user mkauth from 189.112.x.x via ssh
address liste entry added by mk auth


mas essa outra ta dando
 radvd warning   neigbor fe 80::596c:a4a4:7df8:b699 on clinetes uses other stateful configuration


issu é pq estao bloqueadoss pedro?????