Many comments in http://blog.erben.sk/2014/02/06/country-cidr-ip-ranges/ was about IPv6 support.
Country IPv6 ranges
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Xbox One Digital TV Tuner for Czech DVB-T2
My previous post was about WinTVDual-HD working well for Czech DVB-T2. I also own Xbox One Digital TV tuner. Does it work for Czech DVB-T2 when there are warnings about problems with German DVB-T2?
Reliable USB DVB-T2 adapter for Linux
For my tvheadend setup I was searching replacement for my dual multi-standard DVB TBS 5281 adapter, which is not working in recent kernels (>4.17) due TBS obsolete drivers. It is sad, because I was very satisfied with that hardware.
Reset USB device in linux
I had old UPS with serial port which was connected using Profilic USB to serial adapter. Sometimes this USB dongle had frozen and need to be restated – re-attached. This can be done in linux using IOCTL.
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Webmin behind haproxy
After recent security updates, my webmin (now 1.903) served trough haproxy stopped working. Login page was not loading correctly… Continue reading
Windows 10 1809 and later slow on VMware
Recent Windows 10 (since 1809) can behave weird (slow) when running on ESXi.
Enabling WriteCache on LSI RAID adapters
Using mod_geoip in .htaccess
There has been some comments in my old posts trying to use generated country lists in Apache .htaccess. This approach is wrong, and I will show you much better way how to block or allow specific country.
Generating country IP ranges lists #2
My original article about this topic is more that year old and was using Regional Internet Registries (RIRs) list as source and was in python. This post will describe other simple solution how to generate some country IP ranges list.
Performance impact when using VMware snapshots
Using vmware and snapshots? You probably know about vmware best practices about snapshots, which includes
- The maximum supported amount of snapshots in a chain is 32. However, VMware recommends that you use only 2-3 snapshots in a chain.
- Use no single snapshot for more than 24-72 hours. Snapshots should not be maintained over long periods of time for application or Virtual Machine version control purposes.
- An excessive number of delta files in a chain (caused by an excessive number of snapshots) or large delta files may cause decreased virtual machine and host performance.
- Be especially diligent with snapshot use on high-transaction virtual machines such as email and database servers
But what is real performance inpact of snapshot?