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Message in /var/log/messages: Cannot do reverse lookup

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# 1  
Old 08-21-2009
Message in /var/log/messages: Cannot do reverse lookup

Hi I have an entry in hosts.deny and now I get the following message in /var/log/messages:

g 21 09:30:46 machine sshd[12441]: Failed password for illegal user d from ::ffff: port 57181 ssh2
Aug 21 09:30:46 machine sshd[12441]: Received disconnect from ::ffff: 11: Bye Bye
Aug 21 09:30:46 machine sshd[12442]: warning: /etc/hosts.deny, line 6: can't verify hostname: getaddrinfo(213-229 Name or service not known
Aug 21 09:30:47 machine sshd[12442]: Illegal user d from ::ffff:
Aug 21 09:30:47 machine sshd[12442]: input_userauth_request: illegal user d
Aug 21 09:30:47 machine sshd[12442]: reverse mapping checking getaddrinfo for fa

Why is the box trying to do a look up for 213-229-69-442. Shouldn't it be looking for Or are the -'s just proper syntax?
# 2  
Old 08-23-2009
The dashed address is, not 213-229-69-42. It's just the reverse lookup name the the ISP gives that address. It's pretty common practice as that way the address is right there in the name.

What it's telling you is that it can't find a matching forward and reverse DNS lookup for that name so treats it as suspicious (and is is rather suspicious).
# 3  
Old 08-24-2009
It is an IPv6 address. Looks like the DNS server may not have an domain set up.

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