Help with my linux DNS server lookups slow
location: linuxquestions.com - date: September 29, 2006
Hi Linux users,
I hava a Linux server in a business environment. All the PCs connected to it are running Windows XP (and one with Win 2K). The server itself is an IBM eServer xSeries 335 with Linux Mandrake MultiNetwork Firewall, kernel 2.4.18 - I know its old but all attempts to upgrade have failed (another story).
The server has 2 network cards eth0 and eth1. I use this server as a gateway, firewall, proxy, and DNS server between all the PCs in the company and the DSL Internet connection.
My proxy software is squid. I was looking in the squid logs because the Internet has been really slow lately and I've gotten complaints about it. Anyway, the squid log shows everything working well except the DNS lookups.
Under the heading: median service time (seconds) I have: 5 min: 10.14244; 60 min: 9.70242. This tells me that clients are waiting up to 10 seconds for a page to be displayed while the DNS lookup is going on.
I am using a standard ADSL connection with dynamic IP addre
Bind DNS help!
location: linux.com - date: April 18, 2011
i have setup a forward dns entry and i have specified the ip 192.169.x.x (i got this ip from the ifconfig command)
Now when i do nslookup finds the domain perfectly but the problem is that it can be only viewable privately not publically viewable.
I am not sure how to make the domain publically viewable , but what i was thinking is that If i check the main ip address from the www.whatismyip.com and replace my private ip with it. Will that work. or need some other way.
Internet over ethernet. Dns works, ping doesn't (Windows works, linux doesn't))
location: ubuntuforums.com - date: August 16, 2011
Please help! I have a pc connected to the internet using an ethernet connection. Using ubuntu I am able to resolve domains using nslookup, but if I try to run "ping google.com" or "ping 126.96.36.199" it doesn't work.
I have used archlinux, mint and ubuntu live on two netbooks, all of them unsuccessfully. Windows, however, works just fine.
Please help me! Save me from using windows!!!
Here is some network info:
sudo ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:26:18:80:79:18
inet addr:10.20.6.180 Bcast:10.20.7.255 Mask:255.255.254.0
inet6 addr: fe80::226:18ff:fe80:7918/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:5751 errors:0 dropped:0 overruns:0 frame:0
TX packets:2397 errors:0 dropped:0 overruns:0 carrier:17
RX bytes:659976 (659.9 KB) TX bytes:253881 (253.8 KB)
DNS format error
location: linuxquestions.com - date: April 5, 2012
I have deployed Bins as caching DNS. Following are the version:
And I am getting following DNS format error messages in /var/log/messages.
Apr 6 09:45:52 centos1-esslhr named: DNS format error from 188.8.131.52#53 resolving mx2.qq.com/AAAA for client 184.108.40.206#56883: invalid response
Apr 6 09:45:52 centos1-esslhr named: DNS format error from 220.127.116.11#53 resolving mx2.qq.com/AAAA for client 18.104.22.168#56883: invalid response
Apr 6 09:45:52 centos1-esslhr named: DNS format error from 22.214.171.124#53 resolving ns.visp.net/AAAA: non-improving referral
Apr 6 09:45:52 centos1-esslhr named: DNS format error from 126.96.36.199#53 resolving ns2.visp.net/AAAA: non-improving referral
Apr 6 09:45:53 centos1-esslhr named: DNS format error from 188.8.131.52#53 resolving ns.visp.ne
USCERT Alert (TA13088A) DNS Amplification Attacks (Revised 22 July 2013)
location: linuxquestions.com - date: July 22, 2013
US-CERT has released, July 22, 2013: Minor updates to recursion and RRL advice.
If you are using BIND it is worth your time to read.
Problem in adding Default gateway and DNS .
location: ubuntuforums.com - date: June 18, 2010
Well in linux system I want to add IP address along with Default Gateway and DNS.
For assigning IP to eth0 i use the command
# ifconfig etho 192.168.1.10 subnet mask 255.255.255.0 upthis remain temporary and when I restart my system it lost the IP address .Well to permanently add IP address in etho I use the file
#cd /etc/sysconfig/network-scripts and then use # vi ifcg-eth0 to add IP address and Network Mask.
How can I add Default Gateway and DNS permanently in ifcg-eth0 file or there is any other file for it ?
Accessing Apache/Tomcat web server via host name vs. DNS alias
location: linuxquestions.com - date: January 15, 2013
I'm not sure where to look to resolve this, so I'm hoping someone can point me in the right direction.
I have two web servers in my environment that are supposed to be doing the same thing.
server1.domain.com - RHEL 5, Apache 2.2.3, Tomcat5
server2.domain.com - RHEL 6, Apache 2.2.15, Tomcat6
Each server has an alias in DNS:
webserver1.dev.company.com ==> server1.domain.com
webserver2.dev.company.com ==> server2.domain.com
Regardless of how I access server1, (via hostname or alias) I get to my web application without issue.
However, when I access my server2 using the alias, I get prompted to log in using the credentials specified in /etc/tomcat6/tomcat-users.conf before I get to the main page. After that, the main page is a login page and when I enter credentials, the same login page comes back up.
I've verified that if I input incorrect credentials, I do get an incorrect password message, so I know it's passing the credentials through correctly.
Microsoft ISA Firewall Returns Port Scan Warnings From Linux BIND DNS Servers.
location: linuxquestions.com - date: January 26, 2004
I setup two RedHat Linux 9 DNS Servers with their default BIND 9.2.1-16. One is the master 184.108.40.206 and the other is the slave 220.127.116.11 (these are not the actual addresses). Everything works well except that my Microsoft ISA 2000 Firewall returns the warning below under Even Viewer, Application:
Event ID 15105
ISA Server detected an all port scan attack from Internet Protocol (IP) address 18.104.22.168. For more information about this event, see ISA Server Help.
The Linux DNS servers are stand-alone with no firewalling and they are not behind the ISA firewall. My ISA firewall is 22.214.171.124. These warning happen about every one to two hours. Why? Does BIND actually perform a port scan before zone transfers? Is this part of it's mechanism; port scans? Has anybody else experienced this? Please let me know.
[Solved] How do I find my DNS server in 12.04?
location: ubuntuforums.com - date: April 21, 2012
DNS server used to be contained in the file /etc/resolv.conf.
Well, no longer the case in 12.04. The file /etc/resolv.conf shows 127.0.0.1.
how to set the dns servers in 12.04 for a wired conection
location: ubuntuforums.com - date: August 19, 2012
hi, I have two questions, the first is probably involved.
1) I am trying to change my DNS servers and after checking the internet on how to do it I am at a complete loss. I am using 12.04 64 bit, xubuntu with the xfce DE.
My ISP has DNS servers that are used, but I want to change them and try some different servers. My /etc/resolve.conf says "DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN". I did manage to find this:
sudo gedit /etc/dhcp/dhclient.conf
change the line :
perpend domain-name-servers x.x.x.x, y.y.y.y;
and I added two different DNS servers, but when I check my "Connection Information", it shows the two DNS servers that I added, but then a 'ternary' DNS server, which is the original DNS server supplied by my ISP.
I just want the primary and secondary DNS servers that I prepended in the dhclient.conf
2) After setting the DNS servers, is there a way to check to see actually what your DNS servers are? I kno
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