Network problem

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#1 Sat, 03/21/2009 - 11:03
kurdaczek

Network problem

Hello. I have a problem with network settings. Exactly I mean that sometimes I have to wait long to get a connection to my server. Sometimes not read the page, does not want to connect with ssh and ftp.

The computer has the internal IP address, and forwarded the ports. There is no fault of network devices. I tried to go ahead and use Debian and CentOS, but it is the same. Now, the server stands on Debian 5.0.

Please help. Sorry for my poor English.

Sat, 03/21/2009 - 13:20
Joe
Joe's picture

Is DNS service fast and reliable for both the client and the server? (Both FTP and SSH perform a reverse DNS lookup of the client IP when you connect. If reverse DNS is slow, it could cause timeouts or other problems.)

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Sun, 03/22/2009 - 14:44 (Reply to #2)
ronald
ronald's picture

your 3rd nameserver is giving a problem
ns3.netart.pl
Also you have no glue records for the nameservers on your server and the SOA seems not correct.

at kurdak.eu was a gaming clan site. 10 minutes later a gallery of a photographer, per haps you switch it at the moment I looked or dns is not okay

Mon, 03/23/2009 - 06:30 (Reply to #3)
ronald
ronald's picture

your ns1 and ns2 are working but ns3 is not.
if you request the website and ns3 is asked to forward you to the server then it can not fulfil that request as it is not known.
you need to fix dns first before looking further.

when ns1 and ns2 are resolving then they see 3 nameservers, but it ends there..

Nameserver records returned by the parent servers are:

ns2.netart.pl. ['85.128.129.10'] (NO GLUE) [TTL=86400]
ns1.netart.pl. ['85.128.128.10'] (NO GLUE) [TTL=86400]

NS records got from your nameservers listed at the parent NS are:

ns2.netart.pl ['85.128.129.10'] [TTL=3600]
ns1.netart.pl ['85.128.128.10'] [TTL=3600]
ns3.netart.pl ['85.128.130.10'] [TTL=3600]

FAIL: The following nameservers are listed at your nameservers as nameservers for your domain, but are not listed at the parent nameservers (see RFC2181 5.4.1). You need to make sure that these nameservers are working.If they are not working ok, you may have problems!
ns3.netart.pl

Your SOA serial number is: 2008133202. That is NOT OK

--------------------------
dns squish

Asking A.NIC.eu (91.200.16.100) for kurdak.eu (type ANY)

Referral: kurdak.eu is at ns2.netart.pl - IP not supplied
Referral: kurdak.eu is at ns1.netart.pl - IP not supplied ok
Resolving ns1.netart.pl...
Results of lookup:

33.3% 85.128.128.10 (ns1.netart.pl) with 85.128.128.10
33.3% 85.128.129.10 (ns2.netart.pl) with 85.128.128.10
33.3% 85.128.130.10 (ns3.netart.pl) with 85.128.128.10
Resolving ns2.netart.pl...
Results of lookup:

33.3% 85.128.128.10 (ns1.netart.pl) with 85.128.129.10
33.3% 85.128.129.10 (ns2.netart.pl) with 85.128.129.10
33.3% 85.128.130.10 (ns3.netart.pl) with 85.128.129.10

Servers involved in resolving kurdak.eu

The following servers have been encountered and could take over the DNS entry kurdak.eu
ns1.netart.pl 85.128.128.10 Unknown
ns2.netart.pl 85.128.129.10 Unknown
ns3.netart.pl 85.128.130.10 Unknown

however, where is ns3.netart.pl?

50.0% of queries will be returned by 85.128.128.10 (ns1.netart.pl)

kurdak.eu. 3600 IN NS ns2.netart.pl.
kurdak.eu. 3600 IN NS ns3.netart.pl.
kurdak.eu. 3600 IN NS ns1.netart.pl.
kurdak.eu. 3600 IN MX 10 kurdak.eu.
kurdak.eu. 3600 IN A 89.75.106.137
kurdak.eu. 3600 IN SOA ns1.netart.pl. biuro.netart.pl. (
2008133202 ; Serial
28800 ; Refresh
7200 ; Retry
604800 ; Expire
86400 ) ; Minimum TTL

50.0% of queries will be returned by 85.128.129.10 (ns2.netart.pl)

kurdak.eu. 3600 IN MX 10 kurdak.eu.
kurdak.eu. 3600 IN A 89.75.106.137
kurdak.eu. 3600 IN NS ns2.netart.pl.
kurdak.eu. 3600 IN NS ns3.netart.pl.
kurdak.eu. 3600 IN NS ns1.netart.pl.
kurdak.eu. 3600 IN SOA ns1.netart.pl. biuro.netart.pl. (
2008133202 ; Serial
28800 ; Refresh
7200 ; Retry
604800 ; Expire
86400 ) ; Minimum TTL

Mon, 03/23/2009 - 06:43 (Reply to #4)
ronald
ronald's picture

also on http://kurdak.eu/ is a gallery
on https://kurdak.eu/ is a clan website.

seems odd to me, per haps also ssl site is misconfigured?.

Sun, 06/07/2009 - 07:48 (Reply to #5)
kurdaczek

Hello.
Ronald usunoÅ

Sat, 03/21/2009 - 13:54
andreychek

Yeah, as Joe said, DNS could definitely cause what you're seeing... if you log into your server over SSH, what is the output of this command:

time host virtualmin.com

That only tests the DNS on your server (not the client), but it's a start!
-Eric

Sun, 03/22/2009 - 00:54
kurdaczek

DNS is fast,

time host virtualmin.com:
[code:1]
virtualmin.com has address 70.86.4.238
virtualmin.com mail is handled by 5 mail.virtualmin.com.

real 0m0.602s
user 0m0.000s
sys 0m0.004s
[/code:1]

Sun, 03/22/2009 - 11:29 (Reply to #8)
Joe
Joe's picture

OK, so now lookup your client IP:

host 192.168.1.1

Where 192.168.1.1 should be whatever public IP your PC is coming from.

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Sun, 03/22/2009 - 11:32 (Reply to #9)
kurdaczek

My private ip is 192.168.0.111

Sun, 03/22/2009 - 11:34 (Reply to #10)
kurdaczek

debian:~# host 192.168.0.111
Host 111.0.168.192.in-addr.arpa. not found: 3(NXDOMAIN)

Sun, 03/22/2009 - 11:41 (Reply to #11)
kurdaczek

debian:~# host 89.75.110.223
223.110.75.89.in-addr.arpa domain name pointer chello089075110223.chello.pl.
sorry for spam :/

Sun, 03/22/2009 - 12:12 (Reply to #12)
Joe
Joe's picture

So, it's not the reverse lookup.

<div class='quote'>It seems to me that this is something with the network settings, roughly every 10 minutes be suspended, that is to say, I can not access the server but after 30-40 seconds, it's working.</div>

What about that symptom makes you think it is something in the network settings?

Networks usually work or they don't. It's pretty rare for intermittent problems to be network problems.

How much memory do you have on the system?

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Sun, 03/22/2009 - 13:51 (Reply to #13)
kurdaczek

I have 1 GB, so it should not be a problem.
As I installed the Debian 5 and wrote the same network settings are all working well, but after the installation virtualmin something breaks. On Debian, I had the same apache and php and mysql all working well does not interrupt anything

Sun, 03/22/2009 - 21:33 (Reply to #14)
Joe
Joe's picture

<div class='quote'>As I installed the Debian 5 and wrote the same network settings are all working well, but after the installation virtualmin something breaks.</div>

So it's not a networking settings problem. Virtualmin doesn't alter your network settings during installation (or at any other time, really, though it can add interface aliases).

If ronald is correct, and your DNS is misconfigured, that could lead to the problems you describe. I pretty much always assume DNS is misconfigured when any intermittent slowness or connection problems occur.

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Mon, 03/23/2009 - 04:31 (Reply to #15)
kurdaczek

On the HTTP server is different, this is exactly the photo, and https is virtualmin.
I do not know what is wrong, but sometimes it does not I can go to https: / / kurdak.eu: 10000
This is very annoying.

Sun, 03/22/2009 - 11:31 (Reply to #16)
kurdaczek

Please help!
It seems to me that this is something with the network settings, roughly every 10 minutes be suspended, that is to say, I can not access the server but after 30-40 seconds, it's working.
I noticed that the 21:36, 21:47, 22:25 this is happening.

Please for help.

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