# Wido den Hollander

> Personal blog of a Linux and Networking professional

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## Pages

- [Contact](https://blog.widodh.nl/contact/)

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## Posts

- [Linux bridging with Virtual Machines and pure L3 routing and BGP](https://blog.widodh.nl/2025/12/linux-bridging-with-virtual-machines-and-pure-l3-routing-and-bgp/)
- [Routing IPv6 through Wireguard with MikroTik and Debian](https://blog.widodh.nl/2025/03/routing-ipv6-through-wireguard-with-mikrotik-and-debian/)
- [I became a RIPE LIR! :-)](https://blog.widodh.nl/2025/03/i-became-a-ripe-lir/)
- [Using L3 (BGP) routing for your Ceph storage](https://blog.widodh.nl/2024/05/using-l3-bgp-routing-for-your-ceph-storage/)
- [Connect ISG Web to Stiebel Eltron WPL20AC heatpump](https://blog.widodh.nl/2024/01/connect-isg-web-to-stiebel-eltron-wpl20ac-heatpump/)
- [EVPN+BGP+VXLAN between JunOS and FRR (with Cumulus)](https://blog.widodh.nl/2023/05/evpnbgpvxlan-between-junos-and-frr-with-cumulus/)
- [Lenovo X1 Carbon FCC Unlock of EM7455 under Ubuntu 22.04](https://blog.widodh.nl/2023/01/lenovo-x1-carbon-fcc-unlock-of-em7455-under-ubuntu-22-04/)
- [Using fail2ban to block unauthorized calls to CloudStack API](https://blog.widodh.nl/2022/03/using-fail2ban-to-block-unauthorized-calls-to-cloudstack-api/)
- [Proxmox with BGP+EVPN+VXLAN](https://blog.widodh.nl/2022/03/proxmox-with-bgpevpnvxlan/)
- [Combined Charging System (CCS) and IPv6](https://blog.widodh.nl/2021/11/combined-charging-system-ccs-and-ipv6/)
- [Linux mdadm software RAID vs Broadcom MegaRAID 9560](https://blog.widodh.nl/2021/08/linux-mdadm-software-raid-vs-broadcom-megaraid-9560/)
- [Babycam using a Unifi G3 camera](https://blog.widodh.nl/2021/08/babycam-using-a-unifi-g3-camera/)
- [1Gbit fiber connection between MikroTik and Unifi switch](https://blog.widodh.nl/2021/05/1gbit-fiber-connection-between-mikrotik-and-unifi-switch/)
- [Building Ceph .deb packages](https://blog.widodh.nl/2020/12/building-ceph-deb-packages/)
- [Exploring the CAN bus of my Tesla Model S](https://blog.widodh.nl/2020/03/exploring-the-can-bus-of-my-tesla-model-s/)
- [Replacing the eMMC in my Tesla Model S](https://blog.widodh.nl/2020/03/replacing-the-emmc-in-my-tesla-model-s/)
- [Creating a Management Routing Instance (VRF) on Juniper QFX5100](https://blog.widodh.nl/2019/12/creating-a-management-routing-instance-vrf-on-juniper-qfx5100/)
- [Allowing SSH login for user without a password](https://blog.widodh.nl/2019/09/allowing-ssh-login-for-user-without-a-password/)
- [Setting noout flag per Ceph OSD](https://blog.widodh.nl/2019/06/setting-noout-flag-per-ceph-osd/)
- [Comparing two Ceph CRUSH maps](https://blog.widodh.nl/2019/02/comparing-two-ceph-crush-maps/)
- [HAProxy in front of Ceph Manager dashboard](https://blog.widodh.nl/2019/01/haproxy-in-front-of-ceph-manager-dashboard/)
- [Replacing Xeon headlight bulb on Tesla Model S (2013)](https://blog.widodh.nl/2018/11/replacing-xeon-headlight-bulb-on-tesla-model-s-2013/)
- [Renaming a network interface with systemd-networkd on Ubuntu 18.04](https://blog.widodh.nl/2018/11/renaming-a-network-interface-with-systemd-networkd-on-ubuntu-18-04/)
- [VXLAN with VyOS and Ubuntu 18.04](https://blog.widodh.nl/2018/11/vxlan-with-vyos-and-ubuntu-18-04/)
- [Testing with ConfigDrive and cloud-init](https://blog.widodh.nl/2018/05/testing-with-configdrive-and-cloud-init/)
- [Placement Groups with Ceph Luminous stay in activating state](https://blog.widodh.nl/2018/01/placement-groups-with-ceph-luminous-stay-in-activating-state/)
- [Building a Lithium battery for my electric scooter](https://blog.widodh.nl/2018/01/building-a-lithium-battery-for-my-electric-scooter/)
- [Quick overview of Ceph version running on OSDs](https://blog.widodh.nl/2017/11/quick-overview-of-ceph-version-running-on-osds/)
- [Getting connection URL from (Flask) SQLAlchemy](https://blog.widodh.nl/2017/11/getting-connection-url-from-flask-sqlalchemy/)
- [4 years of Tesla Model S ownership](https://blog.widodh.nl/2017/09/4-years-of-tesla-model-s-ownership/)
- [Using the new dashboard in ceph-mgr](https://blog.widodh.nl/2017/06/using-the-new-dashboard-in-ceph-mgr/)
- [Apache CloudStack and MySQL 5.7](https://blog.widodh.nl/2017/04/apache-cloudstack-and-mysql-5-7/)
- [Docker containers with IPv6 behind NAT](https://blog.widodh.nl/2017/04/docker-containers-with-ipv6-behind-nat/)
- [Do not use SMR disks with Ceph](https://blog.widodh.nl/2017/02/do-not-use-smr-disks-with-ceph/)
- [Testing Ceph BlueStore with the Kraken release](https://blog.widodh.nl/2017/01/testing-ceph-bluestore-with-the-kraken-release/)
- [Running headless VirtualBox inside Nested KVM](https://blog.widodh.nl/2017/01/running-headless-virtualbox-inside-nested-kvm/)
- [3 years of Model S ownership](https://blog.widodh.nl/2016/09/3-years-of-model-s-ownership/)
- [Chown Ceph OSD data directory using GNU Parallel](https://blog.widodh.nl/2016/08/chown-ceph-osd-data-directory-using-gnu-parallel/)
- [Calculating SLAAC IPv6 Address in Java](https://blog.widodh.nl/2016/07/calculating-slaac-ipv6-address-in-java/)
- [Calculating DS record from DNSKEY with Python 3](https://blog.widodh.nl/2016/07/calculating-ds-record-from-dnskey-with-python-3/)
- [VirtualBox images to experiment with IPv6](https://blog.widodh.nl/2016/06/virtualbox-images-to-experiment-with-ipv6/)
- [Hitch TLS Proxy performance with 15k certificates](https://blog.widodh.nl/2016/05/hitch-tls-proxy-performance-with-15k-certificates/)
- [AnyIP: Bind a whole subnet to your Linux machine](https://blog.widodh.nl/2016/04/anyip-bind-a-whole-subnet-to-your-linux-machine/)
- [Docker and IPv6 Prefix Delegation](https://blog.widodh.nl/2016/03/docker-and-ipv6-prefix-delegation/)
- [Back home from Norway](https://blog.widodh.nl/2016/03/back-home-from-norway/)
- [Last day before we head back](https://blog.widodh.nl/2016/03/last-day-before-we-head-back/)
- [Snow performance of a RWD Model S](https://blog.widodh.nl/2016/02/snow-performance-of-a-rwd-model-s/)
- [Trondheim to the Lofoten Islands](https://blog.widodh.nl/2016/02/trondheim-to-the-lofoten-islands/)
- [From Middelburg to Trondheim](https://blog.widodh.nl/2016/02/from-middelburg-to-trondheim/)
- [MariaDB Galera cluster on IPv6](https://blog.widodh.nl/2016/02/mariadb-galera-cluster-on-ipv6/)
- [IPv6 Prefix Delegation on a Cisco 887VA behind a XS4All VDSL2 connection](https://blog.widodh.nl/2016/02/ipv6-prefix-delegation-on-a-cisco-887va-behind-a-xs4all-vdsl2-connection/)
- [Fully electric to Norway, again!](https://blog.widodh.nl/2016/02/fully-electric-to-norway-again/)
- [ISC Kea DHCPv6 server](https://blog.widodh.nl/2016/02/isc-kea-dhcpv6-server/)
- [Slow requests with Ceph: 'waiting for rw locks'](https://blog.widodh.nl/2016/01/slow-requests-with-ceph-waiting-for-rw-locks/)
- [IPv6 Router Advertisements under FreeBSD with rtadvd](https://blog.widodh.nl/2016/01/ipv6-router-advertisements-under-freebsd-with-rtadvd/)
- [Using TRIM/DISCARD with Ceph RBD and libvirt](https://blog.widodh.nl/2015/12/using-trimdiscard-with-ceph-rbd-and-libvirt/)
- [Installing and testing NixOS](https://blog.widodh.nl/2015/12/installing-and-testing-nixos/)
- [The Ceph Trafficlight](https://blog.widodh.nl/2015/11/the-ceph-trafficlight/)
- [PXE boot over IPv6 with iPXE](https://blog.widodh.nl/2015/11/pxe-boot-over-ipv6-with-ipxe/)
- [Ceph Monitors are laggy or clock might be skewed](https://blog.widodh.nl/2015/11/ceph-monitors-are-laggy-or-clock-might-be-skewed/)
- [Using the internet on a IPv6-only network](https://blog.widodh.nl/2015/11/using-the-internet-on-a-ipv6-only-network/)
- [Maximum amount of Docker containers on a single host](https://blog.widodh.nl/2015/10/maximum-amount-of-docker-containers-on-a-single-host/)
- [Ubuntu and the changing MAC address with bonding](https://blog.widodh.nl/2015/09/ubuntu-and-the-changing-mac-address-with-bonding/)
- [Using the Link-Local Address of IPv6](https://blog.widodh.nl/2015/08/using-the-link-local-address-of-ipv6/)
- [Playing with CephFS recursive statistics](https://blog.widodh.nl/2015/04/playing-with-cephfs-recursive-statistics/)
- [Rebuilding libvirt under CentOS 7.1 with RBD storage pool support](https://blog.widodh.nl/2015/04/rebuilding-libvirt-under-centos-7-1-with-rbd-storage-pool-support/)
- [Protecting your Ceph pools against removal or property changes](https://blog.widodh.nl/2015/04/protecting-your-ceph-pools-against-removal-or-property-changes/)
- [Open brief: Rotonde bij aansluiting N254/N62 richting Westerscheldetunnel](https://blog.widodh.nl/2015/04/open-brief-rotonde-bij-aansluiting-n254n62-richting-westerscheldetunnel/)
- [To Norway and back using just Tesla SuperChargers](https://blog.widodh.nl/2015/02/to-norway-and-back-using-just-tesla-superchargers/)
- [From Tromsø to Trondheim](https://blog.widodh.nl/2015/02/from-tromso-to-trondheim/)
- [The most Northern SuperCharger on the planet](https://blog.widodh.nl/2015/01/the-most-northern-supercharger-on-the-planet/)
- [We passed the Arctic Circle!](https://blog.widodh.nl/2015/01/we-passed-the-arctic-circle/)
- [Fiskevägen and entering Norway](https://blog.widodh.nl/2015/01/fiskevagen-entering-norway/)
- [Last SuperCharger in Sweden, going to Norway](https://blog.widodh.nl/2015/01/last-supercharger-in-sweden-going-to-norway/)
- [To Copenhagen and almost in Stockholm](https://blog.widodh.nl/2015/01/to-copenhagen-and-almost-in-stockholm/)
- [Ready for departure to the Arctic](https://blog.widodh.nl/2015/01/ready-for-departure-to-the-arctic/)
- [NFS-Ganesha with libcephfs on Ubuntu 14.04](https://blog.widodh.nl/2014/12/nfs-ganesha-with-libcephfs-on-ubuntu-14-04/)
- [Driving to the Arctic with my Tesla Model S!](https://blog.widodh.nl/2014/12/driving-to-the-arctic-with-my-tesla-model-s/)
- [Ceph with a cluster and public network on IPv6](https://blog.widodh.nl/2014/11/ceph-with-a-cluster-and-public-network-on-ipv6/)
- [Een EV is schoner dan een ICE!](https://blog.widodh.nl/2014/11/een-ev-is-schoner-dan-een-ice/)
- [Flash LSI 2308 to IT-mode on a SuperMicro X10SL7-F mainboard](https://blog.widodh.nl/2014/10/flash-lsi-2308-to-it-mode-on-a-supermicro-x10sl7-f-mainboard/)
- [Yealink SIP-T20P on a IPv6-only network](https://blog.widodh.nl/2014/08/yealink-sip-t20p-on-a-ipv6-only-network/)
- [Cisco 887VA with VDSL2 vectoring on XS4All/KPN](https://blog.widodh.nl/2014/08/cisco-887va-with-vdsl2-vectoring-on-xs4allkpn/)
- [PowerDNS backend for a global RADOS Gateway namespace](https://blog.widodh.nl/2014/08/powerdns-backend-for-a-global-rados-gateway-namespace/)
- [USB boot issues on a Soekris net6501-70](https://blog.widodh.nl/2014/07/usb-boot-issues-on-a-soekris-net6501-70/)
- [Limit battery state of charge on a Lenovo X1 Carbon under Ubuntu](https://blog.widodh.nl/2014/07/limit-battery-state-of-charge-on-a-lenovo-x1-carbon-under-ubuntu/)
- [Deploying Ceph over IPv6](https://blog.widodh.nl/2014/05/deploying-ceph-over-ipv6/)
- [Calculating RADOS objects for RBD images](https://blog.widodh.nl/2014/04/calculating-rados-objects-for-rbd-image/)
- [Safely backing up your Ceph monitors](https://blog.widodh.nl/2014/03/safely-backing-up-your-ceph-monitors/)
- [SQL connection error after upgrade to CloudStack 4.3.0](https://blog.widodh.nl/2014/03/sql-connection-error-after-upgrade-to-cloudstack-4-3-0/)
- [Middelburg to Wales and back](https://blog.widodh.nl/2014/03/middelburg-to-wales-and-back/)
- [Filesystems on USB devices for Tesla Model S](https://blog.widodh.nl/2013/12/filesystems-on-usb-devices-for-tesla-model-s/)
- [10.000 elektrische kilometers! Hoe is de stand?](https://blog.widodh.nl/2013/12/10-000-elektrische-kilometers-hoe-is-de-stand/)
- [Waarom een Type 2 laadstation en geen Rode CEE voor een Model S?](https://blog.widodh.nl/2013/11/waarom-een-type-2-laadstation-en-geen-rode-cee-voor-een-model-s/)
- [Changing the region of a RGW bucket](https://blog.widodh.nl/2013/11/changing-the-region-of-a-rgw-bucket/)
- [CloudStack: The given command does not exist or it is not available for user](https://blog.widodh.nl/2013/07/cloudstack-the-given-command-does-not-exist-or-it-is-not-available-for-user/)
- [A quick note on running CloudStack with RBD on Ubuntu 12.04](https://blog.widodh.nl/2013/06/a-quick-note-on-running-cloudstack-with-rbd-on-ubuntu-12-04/)
- [How I built my 3-phase Open EVSE](https://blog.widodh.nl/2013/05/how-i-built-my-3-phase-open-evse/)
- [Redundant Ceph monitors with Round Robin DNS](https://blog.widodh.nl/2013/04/redundant-ceph-monitors-with-round-robin-dns/)
- [CloudStack: Zone X is is not ready to launch console proxy yet ](https://blog.widodh.nl/2013/04/cloudstack-zone-x-is-is-not-ready-to-launch-console-proxy-yet/)
- [Enhanced RBD support for CloudStack 4.2](https://blog.widodh.nl/2013/02/enhanced-rbd-support-for-cloudstack-4-2/)

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