ssh 접속 지연이 발생할때
/etc/sshd/sshd_config 에서
UseDNS no
ip lookup 때문에 지연현상이 발생
There may be a DNS lookup problem, either at the client or server. You can use the nslookup command to check this on both client and server by looking up the other end's name and IP address. In addition, on the server look up the name returned by the client's IP-name lookup. You can disable most of the server-side lookups by setting UseDNS no in sshd_config.
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