flushing the dns

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

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.

using ifconfig to find ip of my dns server

location: ubuntuforums.com - date: June 21, 2012
I run ifconfig to find the ip address of my dns and I see something like this: inet 192.168.2.2 netmask 0xffffff00 broadcast 192.168.2.255 inet 172.16.227.1 netmask 0xffffff00 broadcast 172.16.227.255 what's the difference?

[SOLVED] iptables: port 53 blocked but server resolve DNS query

location: linuxquestions.com - date: June 29, 2010
My server setup is like this. Server: example.org (192.168.1.102) Client: client.example.org (192.168.1.101) Server has DNS server up and running which resolve domains to given ip addresses. There's only one rule in INPUT chain (Default policy ACCEPT). No other rules. Here's how I added it Code:

Creating a web site using a dynamic DNS service

location: ubuntuforums.com - date: June 1, 2013
I'm trying to set up a webpage using Ubuntu 12.04 and a dynamic DNS service. I'm recounting the process for those that follow and for error checking purposes. I installed apache2 on my would be server and verified that I could access it over the WAN. From my laptop, I can enter in 192.168.254.2 and I get the default page. At this point, the address is still dynamically assigned (the .2 means that the server was turned on second), so I need to make the server a static IP address. I edit the /etc/network/interfaces file to be static (because I'm using an old iMac as a server, it is eth2 rather than eth0) *and* use network manager on the server to change the ip address to 192.148.254.5. I have to use ifdown eth2 then ifup eth2 to get this to work - you can't just restart network services. Next I log into my wireless router (determine your ip address with a search engine, then enter it into the web browser) and change it so that incoming HTTP traffic is directed to port 80 (or 8080) on 192

SSH Hangs (not due to DNS problems!)

location: linuxquestions.com - date: July 18, 2003
Hi, Whenever I login to my server using SSH protocol (via putty), I immediately get a typical "login as:" prompt. If I enter a valid username, then the system hangs for quite a while (a minute or so) then prompts me for the password. However, If I enter an invalid username, then there is no delay at all, and the password prompt comes immediately. In the past, I've experienced lots of hanging due to reverse DNS problems, but this isn't the issue here, as I'm connecting via IP address; DNS isn't involved. So, what gives? Any ideas? Thanks a bunch, David

Gobal ssh:knownhosts and DNS CNAMEs

location: linuxquestions.com - date: January 17, 2011
Currently I am populating a global ssh_known_hosts file with RSA and DSS host keys. Code:

SSH Login takes long time (no DNS Problem)

location: ubuntuforums.com - date: April 6, 2010
Hi! I have a problem with the ssh login to my server. After providing the password it hangs about 20 seconds before the prompt comes. The ssh server i have started with following command: /usr/sbin/sshd -p 55222 -D -ddd -e SSH Version Info: OpenSSH_4.7p1 Debian-8ubuntu1.2, OpenSSL 0.9.8g 19 Oct 2007 The problem i have tracked down to the marked line (####) in the sshd debug dump (i think it has nothing to do with DNS). debug2: load_server_config: filename /etc/ssh/sshd_config debug2: load_server_config: done config len = 631 debug2: parse_server_config: config /etc/ssh/sshd_config len 631 debug3: /etc/ssh/sshd_config:5 setting Port 22 debug3: /etc/ssh/sshd_config:9 setting Protocol 2 debug3: /etc/ssh/sshd_config:11 setting HostKey /etc/ssh/ssh_host_rsa_key debug3: /etc/ssh/sshd_config:12 setting HostKey /etc/ssh/ssh_host_dsa_key debug3: /etc/ssh/sshd_config:14 setting UsePrivilegeSeparati

[SOLVED] rsh/ssh problem: POSSIBLE BREAKIN ATTEMPT, most probably due to DNS configuration

location: linuxquestions.com - date: January 3, 2012
Good afternoon, On a HP server, I am running Linux Red Hat 5. I have an application that launches "rsh PSMF" or "ssh PSMF" in background, which goes wrong: the entry "PSMF" is created in the file "/etc/hosts" and the corresponding IP address is found, but there seems to be a mismatch in the other way, as can be seen in following excerpt: smf1 linus> rsh -v PSMF OpenSSH_4.3p2, OpenSSL 0.9.8e-fips-rhel5 01 Jul 2008 debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug1: Applying options for * debug1: Connecting to PSMF [xxx.xxx.xxx.xxx] port 22. debug1: Connection established. debug1: identity file /osp/local/home/linus/.ssh/id_rsa type 1 debug1: identity file /osp/local/home/linus/.ssh/id_dsa type -1 debug1: loaded 2 keys debug1: Remote protocol version 2.0, remote software version OpenSSH_4.3 debug1: match: OpenSSH_4.3 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debu