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Workaround and fixes for the current Core Dump Handling vulnerability affected kernels

Workaround and fixes for the current Core Dump Handling vulnerability affected kernels

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April, 26th. 2006:

Druckversion . pdf icon
You are here: Network

What is Konqueror

Konqueror is the default browser/file manager for KDE.
As time of this writing this is one of only 4 browsers who correctly display the
acid2 test (http://www.webstandards.org/act/acid2/) correctly.

The Problem

One problem of this browser is the lack of an internal dns cache, that means for every http request (each image on a web page) it sends a dns query.

Depending on your internet connection and speed of your dns servers, this can slow things down.

Solution

pdnsd

pdnsd is a tiny dns proxy. pdnsd should be available on most distributions.
Just install the tool via apt-get, rpm, emerge or whatever your distribution uses.

configuring
you can use the default example configuration and modify the cache size and dns server ip.
My config reads this:

global {
perm_cache=2048; # cachesize in kB.
cache_dir="/var/cache/pdnsd";
run_as="pdnsd";
server_ip = 127.0.0.1;
status_ctl = on;
paranoid=on;
min_ttl=900; # store cache at least 15 minutes.
max_ttl=604800; # store cache maximum one week.
timeout=10;
}
server {
label= "myisp";
ip = 192.168.0.1; # enter IP of your dns server
proxy_only=on;
timeout=4;
uptest=if;
interface=eth0;
interval=600;
purge_cache=off;
}

modify /etc/resolv

domain yourdomain
server 127.0.0.1

start the dns proxy

/etc/init.d/pdnsd start

check if the server works by pinging a server

ping www.linuxhowtos.org

if everything works, add the pdnsd to the started services and you are done.

Happy surfing.


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