LinuxQuestions.org

nftables series - part 1 - baby steps

Posted 12-24-2014 at 07:53 AM by serafean
Updated 12-24-2014 at 07:55 AM by serafean

Nftables introduction

I assume a kernel >=3.18 and nft >= 0.4.

I decided to try out nftables, the would-be iptables successor on my home router/server PC.
As a basic guide I used this guide and the pretty good basic documentation on wiki.nftables.org.

Nft comes with a completely empty ruleset. Meaning no predefined tables, chains or rules.
You as a user create tables, populate those with chains (which hook into kernel netfilter hooks)...

serafean

Member

Posted in nftables

Views 2574 Comments 0 serafean is offline

Slow DNS lookups

Posted 11-16-2012 at 05:11 PM by serafean

Since quite some time I had been experiencing slow DNS lookups on some linux boxes. Today I finally got around to fixing it.
Symptoms : KDE fails to load google/wikipedia sometimes. firefox too, less often.

ping was the main tool in this case.
What I found was that

Code:

ping www.google.com

got an IP to ping very fast, however before anything appeared onscreen, it took up to 5 seconds. Pinging the IP address however returned immediately.
On a hunch, I tried disabling...

serafean

Member

Posted in Random fixes

Views 1140 Comments 0 serafean is offline

Lirc & xbmc time

Posted 09-21-2011 at 12:34 PM by serafean

Tags htpc, imon, lirc, xbmc

The Enna media center project stagnating, and the KDE Plasma Media center being developed in GSoC bursts, I got back to using xbmc. xbmc supports lirc, and having an imon panel with a remote, I finally decided to set it up.

The key here was understanding that the iMon device is now supported in the kernel using the new infrastructure. What this did is make the iMon device send normal input events. (I think this is mostly because it does the IR decoding directly in hardware). What...

serafean

Member

Posted in HTPC configuration

Views 1611 Comments 0 serafean is offline

A little ALSA magic

Posted 03-11-2011 at 06:27 PM by serafean

Wanted configuration :

user kde can play sound using the Optical output
user enna can play via analog and optical simultaneously (optionaly HDMI)
Both users can play via Optical at the same time
Both have access to an upmixing device that encodes the stream into A52 and sends via the Optical output

first we name the outputs (link numbers to names, this will be different on your hardware) and add a dmix device for the digital output to the global asoundrc:

Code:

pcm.analog{

...

serafean

Member

Posted in HTPC configuration

Views 2399 Comments 0 serafean is offline

My fight against ads.

Posted 12-13-2010 at 10:22 AM by serafean
Updated 12-13-2010 at 03:57 PM by serafean

Running openwrt on my router and hating advertisements, I decided to look into dnsmasq's possibilities. And indeed it supports hard binding of addresses to Domain names.

adding

Code:

conf-dir=/etc/dnsmasq.d/

to dnsmasq.conf, and putting a file generated by http://pgl.yoyo.org/as/ in there (as ablock.conf) quite securely blocks all ads on my network (and from basic testing, it seems that even ads at the beginning of flash videos are filtered out. YAY!).

I know using /etc/hosts...

serafean

Member

Posted in Uncategorized

Views 1227 Comments 0 serafean is offline

Page 2 of 3