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2006-01-26 (Thu)
_ [net] sshd[1234]: reverse mapping checking getaddrinfo for failed - POSSIBLE BREAKIN ATTEMPT!
今日、某鯖にこんなログが出てました。 ふつーは getaddrinfo for のあとに、ホスト名(アクセス元の逆引き) が出るはずなのに、なぜかそこがカラッポ。
その直前のログは
sshd[1402]: Invalid user negro from 72.20.1.178
って感じなので、多分この 72.20.1.178 からアクセスしてるのだろうと思って、 とりあえず逆引きしてみると・・・
% dig -x 72.20.1.178 ...(略)... ;; ANSWER SECTION: 178.1.20.72.in-addr.arpa. 853 IN PTR . ...(略)...
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