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Old 12-15-2010, 08:06 PM   #1
trueno_ray
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Registered: Dec 2010
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DNS recursion impact sendmail


Dear All,

I have a server provided dns and sendmail service, dns keeping record for my public servers. I don't want my server to be open dns server,
so I just add recursion and forwarders option to named.conf, like:
allow-recursion {192.168.x.x/24; 123.123.x.x/28; 127.0.0.0/8;};
forwarders {publicDNSipA; publicDNSipB;};

After restart named, all sendmail user can't mail to other internet account (like xxxxx@gmail.com); but local account is ok

version:
sendmail - 8.9.3
bind - 8.2.3

Is there any problem on my config?

Thanks your help

Last edited by trueno_ray; 12-15-2010 at 08:08 PM.
 
Old 12-16-2010, 12:40 AM   #2
bathory
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Registered: Jun 2004
Location: Piraeus
Distribution: Slackware
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Hi,
Quote:
After restart named, all sendmail user can't mail to other internet account
You should give more details, like what's logged in /var/log/maillog, or what gives:
Code:
dig mx gmail.com
Anyway, use 127.0.0.1 instead of 127.0.0.0/8, as both bind and sendmail running on the same box, and see if it works.

Quote:
version:
sendmail - 8.9.3
bind - 8.2.3
You're running very old versions of both programs. Consider upgrading for security reasons.

Regards
 
Old 12-16-2010, 01:02 AM   #3
trueno_ray
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Registered: Dec 2010
Posts: 5

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Thanks bathory,

I just find out after config recursion and forwarders to named, everything work fine, but after about 1 hour named and smtp server response time is very long, 2 hour later, I can't send mail to internet mail accout as I said, it seems response time out.

In /var/log/message, every second i get too many "denied recursion query" from a range of internet IP
 
Old 12-16-2010, 02:29 AM   #4
bathory
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Hi,

It looks like your name server suffer from some kind of DDOS. You should setup your firewall to block incoming traffic to port 53 udp/tcp at least for these hosts.
And once again consider upgrading.

Regadrs
 
  


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