New answers tagged reverse-dns
When you create a reverse zone you need to reverse the IP range. If you want to create the zone for 10.1.2.0/24 you need to name it 2.1.10.in-addr.arpa or in your case 0.0.10.in-addr.arpa. Yours is the other way around.
Assume your mail server name is multiformeingegno.it (myhostname value in postfix) and your server has two IPs 188.8.131.52 and 184.108.40.206 and you are sending a mail from firstname.lastname@example.org, setting up all the following is always recommended. A record of multiformeingegno.it pointing to 220.127.116.11 and 18.104.22.168 PTR record for 22.214.171.124 and 126.96.36.199 pointing to ...
To fix this, you need to make sure that your PTR record for your server's IP address corresponds to your server's advertised hostname. Your hosting provider (or whoever provided you with the IP address) should be able to help you with this, as reverse DNS administration (usually) lies with the controlling ISP, normally defined in WHOIS. Essentially, ...
Can you post your sshd_config? Testing with FreeBSD 9.1 and 9.2 indicates that with UseDNS set to no, and no other configuration item set that might cause a DNS lookup, no lookups occur.
Use DNS = no does not prevent sshd from performing DNS lookups, it prevents it from rejecting clients when PTR records don't match. -u0 prevents sshd from logging DNS names in the utmp struct. lookups might still happen depending one what a user has in their authorized_keys. See this for a decent explanation: ...
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