Linux

Windows 7 hammering dnsmasq

Byetzion 01/02/2014

I migrated to dnsmasq just yesterday, and discovered that a Windows 7 machine was hammering the server with messages like this:

Feb 1 11:06:07 dns dnsmasq-dhcp[1078]: DHCPINFORM(eth0) 192.168.1.77 91:de:87:7b:e5:a8
Feb 1 11:06:07 dns dnsmasq-dhcp[1078]: DHCPACK(eth0) 192.168.1.77 91:de:87:7b:e5:a8 winpc

Googling a bit, I found out this link (with an explanation). The solution is fairly simple. Add the following line to your dnsmasq.conf file to solve the problem:

dhcp-option=252,”n”

Linux

SABnzbd and high CPU usage on weak CPUs

Byetzion 21/07/2013

SABnzbd is a nice tool. I just replaced my previous nzbget with it, due to its better handling of the obfuscated names in usenet groups. However, on an Atom CPU, the max download speeds did not go over ~5MB/s on a 100Mb/s link. This is rather sad, because nzbget did get the whole ~11MB/s speeds….

Linux | Virtualization

After a very long absence, Changing Linux HVM to PV on Xen

Byetzion 08/05/2010

I have had a stressed time, and had no time to actually write down anything here. This is pity, since I have been doing so many things worth sharing. I will start with a small one now – how to convert a physical machine into Xen-based VM. I assume you know the drill of how…

Linux

Quick and dirty – modifying Boel initrd files manually

Byetzion 02/07/2007

Boel initrd files are actually compressed cramfs files. This is a menuscript for authoring and modifying these files, if needed. Assume the file in question is /tftpboot/install-initrd-i386.img: cp /tftpboot/install-initrd-i386.img /tmp/ cd /tmp/ gzip -S .img -d install-initrd-i386.img mount -o loop install-initrd-i386 /mnt mkdir initrd cd /mnt/ tar cf – . | (cd /tmp/initrd/ ; tar…

Linux

My menuscript for a happy Ubuntu 64 bit installation

Byetzion 19/03/2007

I have been extremely busy for the last few weeks and couldn’t find time to update my blog, so apologies are in place. I am sorry, and I will add later this week several tips and tricks about BASH scripting, which might save time and effort for those of you who use if for more…

Linux

Work around ISP QoS limitations

Byetzion 29/05/2009

ISPs which enforce QoS limitations suddenly, without alerting the customer, are abusing their force. QoS limitation is not a bad thing, from the ISP’s point of view, but changing the customer deal without notifying him seems to me to be unfair. This is a recipe for a QoS workaround. Ingredients: One fast Internet connection which…

bash | General Hardware | Linux | Scripting/Programming

RaspberryPi Zero loses connectivity

Byetzion 09/07/202111/03/2023

I have had a problem with RPI Zero. The system was working fine, and then it did not. I am using Raspbery Linux (Debian-based) with kernel 5.10.17+. Once a while (usually with network load) the system loses connectivity. Everything seems to be fine, if you have a serial/USB console there, but the wireless network fails….

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