dns caching

DNS Flush in Maverick

location: ubuntuforums.com - date: October 21, 2010
Hello, I've been having a baffling problem in Maverick (which has otherwise performed flawlessly, thanks, Devs!) I connect fine to everything on the Internet--except to my account at my ISP. I can connect to my email account neither via Thunderbird nor via Firefox. I have Lucid installed on another partition and it connects normally via both Thunderbird and Firefox. I've troubleshot this extensively with a tech at my ISP. At one point he suggested DNS flushing. So I installed nscd and followed with 'sudo /etc/init.d/nscd restart'. No luck. Then I restarted Maverick and, hey presto! I could connect. When I logged on today, I had the same problem, ran 'sudo /etc/init.d/nscd restart' again--no luck--restarted and I could connect again. So it seems that every time I want to connect to my email, I have to run 'sudo /etc/init.d/nscd restart' and then restart the computer. Any ideas? I'd greatly appreciate any advice. Thanks in Advance, mike

DNS resolving Ubuntu 13.04 (64bit)

location: ubuntuforums.com - date: April 28, 2013
Hi everybody, First of all, this is my first post, since I managed to solve all other problems I ever had using Ubuntu by other post on this forum (Thanks for that by the way!), but this time I didn't find the solution, so if the post in the wrong location: sorry! After a fresh install of Ubuntu Desktop 13.04 (64-bit) on a pc that previously had Ubuntu 12.10 installed, my DNS resolving is giving some strange issues. In short, I can't ping a host name of an internal device, but I can ping the ip address. This only happens internally, so pinging www.google.com or 173.194.78.99 works OK. In the morning, before the upgrade, it worked perfectly and after the upgrade, it doesn't work at all. I've got a home server running Ubuntu Server 12.04.2 LTS OS with two virtual machines: dns1 (primary master) and dns2 (secondary master), both are using Bind9 for internal DNS resolving and caching, also running Ubuntu Server 12.04.2 LTS. Both the servers are working without issues, since on other dev

DNS Changer on Ubuntu 12.04

location: ubuntuforums.com - date: June 8, 2012
Hello everybody, I have got the following problem: I have visited the following webpage (http://www.dns-ok.us) and it said that my pc is infected with DNS Changer virus. Please, is there anyone who can help me to remove that virus? I have got Ubuntu 12.04 on my pc. PS. I found solutions for Windows, but could not find for Linux.

howto flush dns cache

location: linuxquestions.com - date: May 6, 2004
what is the command used to flush the local cached dns on fedora core 1. Thanks

[SOLVED] No browsing flush DNS?

location: linuxquestions.com - date: November 15, 2011
Today, I load up Ubuntu as normal, but although my web browser will display my router's "admin page" (like it normally would) where I can see total amount downloaded etc, it refuses to browse to any other page on the internet. Evolution does not want to get my emails either. However, Transmission is okay downloading and uploading files/torrents. Router seems logged onto internet okay, so clearly I'm connected to something. Neither Firefox nor Chrome will bring up any web content. However, my system is dual-boot so on loading into Windows XP to see what happens, browsing is normal, no problems. In fact I am typing this message from Windows - no choice! I remember something about a "DNS cache" being corrupted as being the reason for browsing not being possible sometimes; however one website says "Ubuntu doesn't cache DNS records by default so unless you've installed a dns cache there isn't anything to clear". So, given my inability to surf in Ubuntu,

Display and Flush DNS cache

location: linuxquestions.com - date: March 18, 2005
Hello, I have a computer assignment and I need the right command in linux. I need to display recent DNS records and clear them whenever I want. In windows "ipconfig /displaydns" and "ipconfig /flushdns" commands are used respectively. Are there any commands in linux which are equivalent to these ones? or in Linux isn't there such an option? Can "ifconfig" solve this problem? If yes what should be the exact options and command line?

Squid DNS cache

location: linuxquestions.com - date: March 10, 2007
I have squid on OpenBSD 4.0 I'm having trouble accessing a specific website thru squid...without squid it gets there without any problem. I'm thinking it may be the internal dns cache of squid that is the cause of the issue. The DNS server is on windows 2003 and I already clear the cache entries there. Does anyone know to clear the internal squid dns cache? Thank you

slow DNS resolution in Ubuntu

location: linuxquestions.com - date: August 26, 2005
I encounter slow domain name resolution in mozilla firefox. My system is UBUNTU 2.6.10-5-686 kernel.. THe network schema is ADSL modem >> TLink -WR541G router >> my computer. The model of my computer is IBM thinkpad T21, with dual system of Ubuntu and Winxp. My problem is that it takes me a very long time to resolve a domain name (in the status bar of firefox, the words "looking up ....domain name..." stay for a long time. Quite often, the name was not resolved and timed out. I tried to ping google or yahoo website, it is slow, sometime, timed out. I have searched the posts and confirned that modifying the file /etc/resolv.conf did not help (not matter I change it to previous one plus 192.168.1.1 or not). THe IP address is the same as the DNS server displayed using ipconfig /all in Winxp. Now the thing is that Winxp can resolve simialr webiste quite fast. (note, in order my network (non-wireless one, eth0) card to work, I add apci=off in menu

[SOLVED] Youtube Video Caching.

location: linuxquestions.com - date: July 19, 2012
Dear All, This is my first post for all linux users. I have a scenario to do that squid cache youtube videos. I do all best search and tried but fail to cache videos. Any one can help to do easy way to do youtube video caching. Please this is very necessary for me. Thanks all.

How to find my IP, DNS..?

location: ubuntuforums.com - date: January 28, 2010
I'd like to find my DNS Server. To be able to run so other programs... I typed in Terminal: [email protected]:~$ route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 24.141.16.0 0.0.0.0 255.255.240.0 U 1 0 0 eth0 169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 eth0 0.0.0.0 24.141.16.1 0.0.0.0 UG 0 0 0 eth0 [email protected]:~$ route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 24.141.16.0 * 255.255.240.0 U 1 0 0 eth0 link-local * 255.255.0.0 U 1000 0 0 eth0 default d24-141-16-1.ho 0.0.0.0 UG 0 0 0 eth0 If anyone could help that would be great. Also, I'm a newbie, so I need step by step. Thanx.