DNS Lookup Explanation
Mar 14, 2007
I want to know how serious following nameserver problem can be in reality:
[url] ?
From DNS timing someone could conclude it's a slow hosting.
Can anyone explain above results "accurately" ? I still don't know what's "good" result in DNS timing: A or F?
The problem is that
[url] loads slow (5-10 seconds on T1 connection), here's a speed test. I'm aware images and scripts contribute to slow site loading.
My question is: Beside removing some images from the Home page, is it any reason to change the hosting (regarding DNS tests).
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Oct 12, 2005
can some body tell me rougly how DNS works, is there only one DNS server in the world? if so where is it?
what is DNS A record, DNS cname record, DNS mx record?
how shall i point my DNS address to the host?
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Jul 31, 2009
I have 5 ip address from my isp and i want to assign each domain an ip address for ssl cert reasons. The server is behind a 2wire router. I have assigned the server one of the static ips 217.xxx.xxx.37. On the server i have created virtual ips on the one network card eth0 - ie eth0:0, eth0:1, eth0:2, eth0:3. In the control panel at my domain registrar i have assigned an ip address each to a domian ie domain1.com -> 217.xxx.xxx.37, domain2.com -> 217.xxx.xxx.38, domain3.com -> 217.xxx.xxx.39, domain4.com -> 217.xxx.xxx.40.
My question is since the server is known as 217.xxx.xxx.37 on the router, how will the router know that all request to 217.xxx.xxx.38, 217.xxx.xxx.39, 217.xxx.xxx.40 should be handled by 217.xxx.xxx.37?
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Jul 7, 2008
this is something that struck me, that is what are the benefits (pros and con) of being hosting on a clustered webhosting / clustered vpses
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May 5, 2008
if I do a reverse lookup on my server's IP it returns a host assigned by the data center. So is this something I should even be managing too or is that always left up to the DC? I run my own DNS for the forward lookup zones.
Also just a technical question, when you do a reverse lookup, how does it know where to look to get the host? I'm not sure I fully understand how these work.
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Jan 13, 2008
Somebody purchased a domain from a popular registrar. When you lookup the domain, it points to its own name servers (i.e. ns1.registrar.com and ns2.registrar.com), which means that it is hosted by them as well. correct?
this person is saying they bought their domain from the registrar, but they are hosted by company X. he says that he is pointing the ip address of his web site on company X to his registrar.
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Sep 26, 2007
Friend of mine asked me what "CURL named lookup issue resolved" means, he's got a CentOS 4 machine, with cPanel/WHM latest builds I tried recompiling apache and even cPanel at some point but no good..
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May 28, 2007
I am having a problem. My server was able to ping google.com successfully before installing DirectAdmin.
However after installing DirectAdmin, I am no longer able to ping google.com anymore. I just get a host cannot be found error. This is the same with all other domains.
The /etc/resolv.conf is exactly the same, so I do not know the issue. I also have other servers using the same nameserver and are still able to ping and resolve successfully.
The main problem here is that exim no longer can send email as it cannot lookup the hostnames.
the error from exim is: R=lookuphost defer (-1): host lookup did not complete.
Thats the only error within the message.
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Nov 17, 2006
My VPS Config:
centos with webmin
mail program sendmail
Its a newly configured VPS have a problem with smtp realying through outlook and other smtp programs. When i use smtp on outlook it give following error:
The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was 'xxxxx@yahoo.com'. Subject 'Outlook', Account: 'Testing', Server: 'xxxx.com', Protocol: SMTP, Server Response: '550 5.7.1 <xxxxx@yahoo.com>... Relaying denied. IP name possibly forged [xx.xxx.xx.xxx]', Port: 25, Secure(SSL): No, Server Error: 550, Error Number: 0x800CCC79
I want to make outgoing authentication activate instead of allowing some iprange or domain for relaying through /etc/mail/access.
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May 14, 2009
ffmpeg: symbol lookup error: /usr/lib/libavcodec.so.52: undefined symbol: speex_header_free
I am using a centos 5 vps
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May 30, 2009
I have six dedicated servers on a VPR. I use one of these as the Database server and the other five connects to that server to read the Database.
When I setup my scripts for the first time I used the external IP to connect to the DB server. Everything worked perfect for these weeks:
mysql_connect('174.xxx.xxx.xx', 'user', 'pass');
Since three days ago I finally received the internal IPs of my servers and now I use the internal IP of the DB server:
mysql_connect('10.0.0.1:3306', 'user', 'pass');
When I did this last change this my database started to collapse. Queries stuck on a bottleneck every 10 minutes. Here's an example:
40468 simon 10.0.0.7:47002 pkindigo_db Query 115 Locked update `captured` set hp_left = '79', status = 'normal', att1pp = '25', att2pp = '30', att3p
40523 simon 10.0.0.2:58080 pkindigo_db Query 115 Locked update `captured` set experience = '5120', level = '16', hp_left = '58', hp = '58', status =
... (tons of locked queries before) ...
As you may see table is locked since 115 seconds for a simple update... after some hours this ends on a "#1135 - Can't create a new thread (errno 13); if you are not out of available memory, you can consult the manual for a possible OS-dependent bug" and even some of my tables finally crashing.
I think that my Database stuck because of a DNS lookup delay. When I had this problem before using the external IPs, I added skip-name-resolve and the problem was fixed. But now with the internal IPs it seems that's not enough.
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Aug 3, 2009
I'm having tons of problems trying to get reverse lookup working on my dns server. I've scoured the net and tried lots of methods but so far none work.
Forward lookup DNS is working perfect, but reverse lookup is completely broken.
db.44.80.212.67:
Code:
$TTL 86400 ; Default TTL in secs(1 day)
@ IN SOA ns1.capturetheprize.com. info.capturetheprize.com. (
2009072902; serial number YYMMDDNN
28800 ; Refresh
7200 ; Retry
864000 ; Expire
86400 ; Min TTL
)
IN NS ns1.capturetheprize.com.
IN NS ns1.mytempmail.com.
; Reverse lookups
44 IN PTR ns2.mytempmail.com.
44 IN PTR ns1.mytempmail.com.
44 IN PTR ns2.capturetheprize.com.
44 IN PTR ns1.capturetheprize.com.
44 IN PTR mail.mytempmail.com.
44 IN PTR mail.capturetheprize.com.
44 IN PTR stats.capturetheprize.com.
44 IN PTR secure.capturetheprize.com.
named.conf
Code:
zone "80.212.67.in-addr.arpa" IN {
type master;
file "etcdb.44.80.212.67";
allow-transfer { localhost; };
};
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Jul 19, 2008
if its possible to change the reverse lookup, or at least i think thats what it is called.
I have 2 accounts on my CentOS, WHM/cPanel VPS and they are hosted on their own seperate IPs however when you do a lookup on one domain it also lists the other domain as being hosted on the server and vice-versa.
How do i change this so they appear like they are on different servers? Each one has their own nameservers which are on seperate IPs also.
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Feb 18, 2008
My MySQL server slowed down to a crawl a few days ago, and I finally fixed it by starting it without DNS lookups via "--skip-name-resolve".
I tested domain name resolution on the MySQL machine and it was able to return IPs from domains rather quickly, so I'm at a loss as to why DNS was the problem here? I am using "192.168.1.6" as the MySQL server's IP, in case that matters?
I have a couple of questions:Why is DNS resolution so slow when in the command line it's running normally?
Why does MySQL need to do DNS lookups at all? I don't see any log files that's converting IPs to host names or vice versa.
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May 11, 2007
Where am I sending e-mails from with the below settings:
(Is it mail.freesexdoor.com, www.freesexdoor.com, 64.85.161.123 or 64.85.161.124?)
My secondary question is: Is creating own reverse IP lookup to 64.85.161.124 possible and beneficial in my case? If so, what should I replace this SPF line with: freesexdoor.com. TXT "v=spf1 a mx ip4:64.85.161.123 ?all"?
I'm trying to improve freesexdoor.com's e-mail delivery ratio because hotmail and gmail deliver my PHP mailer's sent confirmation e-mails to the junk folder. I've done everything I can to improve the sent headers etc. so there's only one more possible way to improve it: (That I can think of). Freesexdoor.com is hosted on the same server as mitorahgames.com.
DirectAdmin control panel on CentOS 4.4.
My server's primary IP is: 64.85.161.123
My server's hostname is: server.mitorahgames.com
server.mitorahgames.com's Related DNS Settings:
mailA64.85.161.123
server.mitorahgames.com.A64.85.161.123
server.mitorahgames.com.NSns1.mitorahgames.com.
server.mitorahgames.com.NSns2.mitorahgames.com.
mailMX10
123.161.85.64.in-addr.arpaPTRserver.mitorahgames.com.
server.mitorahgames.com.TXT"v=spf1 a mx ip4:64.85.161.123 ?all"
freesexdoor.com's IP is: 64.85.161.124
freesexdoor.com's Related DNS Settings:
freesexdoor.com.A64.85.161.124
mailA64.85.161.124
mailMX10
freesexdoor.com.TXT"v=spf1 a mx ip4:64.85.161.123 ?all"
I'm by the way putting www.freesexdoor.com (PHP reported server name) to the Message ID: field in the e-mail headers. Would putting IP there perhaps work better? If so, which IP?
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May 18, 2007
I want to hide my NS records on WHOIS lookup, or show a fake or something so that no one can find me, Is it possible,
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Aug 21, 2009
I have a windows 2000 server and I would like to configure two domain names, c.com and bnvsaj.c.com and requests to these domains should be forwarded to 192.168.0.1 and 192.168.0.2. How can I configure like this?
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Jul 4, 2007
One of my customers uses Webmasters Tools from google , looking at what pages he have indexed by Googlebot, found that 180 pages are giving a "DNS lookup timeout" error, tried searching for help on google and the only thing that i found is " We received a timeout on DNS lookup."
DNS are ok, same as the zone file, everything is responding OK, I dont know what can be the issue.. ? any ideas ?
Im using Ensim Pro and RHES 4.
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Sep 27, 2009
I regularly have DNS issues with some of my sites hosted with a specific host... At random sites, the urls done resolve and I get a DNS error.
Just to find out that a few hours later it loads again without issues...
I always thought it had something to do with my ISP... My host says that there's nothing wrong with their DNS.
However, I asked a few people now and it seems they're having DNS problems too sometimes when accessing the problematic urls...
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Feb 20, 2015
I'm getting the below error message when trying to perform "configtest" after upgrading apache to 2.4.12 version with success.
/home/apache/bin/httpd: symbol lookup error: /home/apache/bin/httpd: undefined symbol: SSL_CONF_CTX_new
Note: I received the error after recently upgrading my openssl to 1.0.2.
Just wonder how to get rid of the error message.
Running on Ubuntu Server 12.04.05 LTS 32bit.
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