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Old 12-17-2015, 09:26 AM   #1
Carinavb
LQ Newbie
 
Registered: Dec 2015
Posts: 6

Rep: Reputation: Disabled
BIND 9 - Connection timeout


I have a DNS server configured, but unable to nslookup/dig itself.
It was working perfect for three years.
Getting the following error. Could anyone help me out with the solution and reason?

BIND 9.7.3

It seemed to be a networking problem, but I don't know what I must check. The server doesn't responde pings from outside.
I used debian squeezy.

I post some information here....
ping www.yahoo.com.ar --> nothing
ping 74.6.50.150 --> nothing


cat /etc/hosts
127.0.0.1 localhost
xxx.xxx.xxx.2 midns.midominio.com.ar midns

# The following lines are desirable for IPv6 capable hosts
::1 localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts

cat /etc/resolv.conf
domain midominio.com.ar
search midominio.com.ar
nameserver xxx.xxx.xxx.2
nameserver 200.69.193.1
nameserver 8.8.4.4
nameserver 8.8.8.8

options {
directory "/var/cache/bind";

// If there is a firewall between you and nameservers you want
// to talk to, you may need to fix the firewall to allow multiple
// ports to talk. See http://www.kb.cert.org/vuls/id/800113

// If your ISP provided one or more IP addresses for stable
// nameservers, you probably want to use them as forwarders.
// Uncomment the following block, and insert the addresses replacing
// the all-0's placeholder.

// forwarders {
// 0.0.0.0;
// };

auth-nxdomain no; # conform to RFC1035
//recursion no;
//listen-on-v6 { any; };
allow-query { any; };
//allow-query {xxx.xxx.xxx.0/24; 200.3.61.0/24; 192.168.24.0/24; 127.0.0.0/8;};
//managed-keys-directory "/etc/bind";
//dnssec-enable yes;
dnssec-validation yes;
listen-on { any;};
//allow-recursion { none; };
empty-zones-enable no;
//acl internals { 127.0.0.0/8; xxx.xxx.xxx.0/24; };
version none;
};

Please...help me find out what's happening.
Regards
 
Old 12-17-2015, 09:54 AM   #2
lazydog
Senior Member
 
Registered: Dec 2003
Location: The Key Stone State
Distribution: CentOS Sabayon and now Gentoo
Posts: 1,249
Blog Entries: 3

Rep: Reputation: 194Reputation: 194
Look at your network cable where it plugs into the server and ensurte that you are getting lights and they are blinking to show activity. Also check your netwok configuration on the server to ensure that everything is setup correctly with

Code:
ifconfig
If you don't see what you think is correct then reset your interface with:

Code:
ifdown <interface>
<internerface> would be that of your interface that the network is connected to

Code:
ifup <interface>
Do you have more then one network interface on your system? If so check to ensure you are plugged into the correct port. You can see your active interfaces with:

Code:
ifconfig
Or you can see all intoerfaces, regardless if they are up or down, with:

Code:
ifconfig -a
 
Old 12-17-2015, 02:54 PM   #3
Carinavb
LQ Newbie
 
Registered: Dec 2015
Posts: 6

Original Poster
Rep: Reputation: Disabled
Thanks for the answer lazydog. I find out wich was the problem.
The bandwidth controller server. It is in the same network and generates a lot of traffic.
I made a complain with the administrator and now it's working.
How I can detect if it was denial of service attacks?
How should I prevent this problem?

Regards
 
Old 12-18-2015, 07:28 AM   #4
lazydog
Senior Member
 
Registered: Dec 2003
Location: The Key Stone State
Distribution: CentOS Sabayon and now Gentoo
Posts: 1,249
Blog Entries: 3

Rep: Reputation: 194Reputation: 194
You need to know what type of traffic and amount of traffic is normal for your system. When you see an unusual amount or type then it could be a DOS attack. To stop this you have to talk to your upstream provider and get them to cut the traffic.
 
  


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