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тАО05-30-2005 02:34 AM
тАО05-30-2005 02:34 AM
What kind of problems could have a name server (DNS server)
or a webserver if his Reverse DNS lookup doesn't work.
kind regards
chris
Solved! Go to Solution.
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тАО05-30-2005 02:37 AM
тАО05-30-2005 02:37 AM
Re: Reverse DNS lookup
if so:
attach /etc/named.conf and the file of reverse lookup zone
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тАО05-30-2005 03:25 AM
тАО05-30-2005 03:25 AM
Re: Reverse DNS lookup
simple:
all network establishing request to that server will be delayed by minutes.
the server will try to reverse lookup the connection query to find out the server name, if it is not able to find out depending on the security of the application it either discards the connection or times out and accepts it
Regards,
Gopi
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тАО05-30-2005 03:38 AM
тАО05-30-2005 03:38 AM
Re: Reverse DNS lookup
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тАО05-30-2005 02:11 PM
тАО05-30-2005 02:11 PM
Re: Reverse DNS lookup
It could be the reverse zone is not listed in /etc/named.conf
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тАО05-31-2005 11:02 PM
тАО05-31-2005 11:02 PM
Re: Reverse DNS lookup
Any network application using tcp wrapper (such as telnet) will experience a delay while trying to establish a connection.
Apart from that, when you do nslookup, your DNS server's name would be 'unknown' since the IP od DNS server will not have a PTR record.
Regards
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тАО06-01-2005 12:58 AM
тАО06-01-2005 12:58 AM
Re: Reverse DNS lookup
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тАО06-02-2005 01:13 AM
тАО06-02-2005 01:13 AM
Re: Reverse DNS lookup
u mean , ur server's ip doesnt have a reverse dns entry OR ur server cannot do any other ips reverse dns lookup ?
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тАО06-02-2005 06:12 AM
тАО06-02-2005 06:12 AM
Re: Reverse DNS lookup
I mean every server without reverse DNS lookup,
for example:
bsd# host 212.244.86.18
Host not found.
I think some mail servers will deny the mails from the servers without reverse DNS lookup.
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тАО06-02-2005 10:22 AM
тАО06-02-2005 10:22 AM
SolutionYou don't need them for every server. You need them for the ip address that is actually being used to send the mail.
If the mail from server1 is relayed by relay1, the IP address on the public Internet that does the actualy work of transferring the mail to other servers needs a reverse lookup address for that IP address.
SEP
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com