This is not an SSH support list. SSH uses OpenSSL libraries, but that's the extent of it.
My conjecture (and this is only my conjecture): you may be running TCP wrappers, or you may have host-based access blocking disabled. In any case, it's at least used for logging purposes (since names are easier than numbers to communicate). The question that I'd ask, though, is "do you know which component would do it? Is it perhaps a PAM in your system that is queried by the sshd to perform host-based blocking?" -Kyle H On Wed, Apr 28, 2010 at 9:40 AM, barx <[email protected]> wrote: > > Hello > > When sshd has received the username of a linux user from a SSH client, it > look likes it send a PTR request on the client's IP. > > for example, if 192.168.56.106 start a connection on a sshd server running > on 192.168.56.1, this machine will send a PTR request on > 105.56.168.192.in-addr.arpa just after the user name has been received. > > My question is simple: what is the point of doing this request ? I > understand that sshd is trying to know if the client has a domain name, but > why ? > > thank you > -- > View this message in context: > http://old.nabble.com/Why-sshd-makes-a-PTR-dns-request-after-receiving-user%27s-name---tp28391111p28391111.html > Sent from the OpenSSL - User mailing list archive at Nabble.com. > ______________________________________________________________________ > OpenSSL Project http://www.openssl.org > User Support Mailing List [email protected] > Automated List Manager [email protected] > ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List [email protected] Automated List Manager [email protected]
