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Category Archives: Networking
Contabo: A great cloud for personal use
I’m a personal user of Contabo’s cloud services, and I’ve been delighted with them. They offer a wide range of services to choose from, including VPS, dedicated servers, and cloud storage. I’m currently using a VPS to host my personal … Continue reading
Posted in Computer, Linux, Networking, Storage, Virtualization
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Suricata and fail2ban
In case you want to ban IP addresses based on Suricata fast.log, here is the filter you need: In the jail configuration, I suggest you change the default blocktype from REJECT to DROP. Edit 2023-03-24: you may want to use … Continue reading
Posted in Computer, Linux, Networking, Security, Ubuntu
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Fortigate: SAML authentication in firewall policy with Keycloak
First, create a new Single Sign-On authentication under User & Authentication. As of version 7.0.6, the GUI does not specify ports and does not let you change them either. To work around this, use the CLI. Default ports used by … Continue reading
Posted in Networking, Security, Uncategorized
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Elasticsearch in Docker: threat intelligence with filebeat
Goals: collect observables from supported feeds collect observables from unsupported feeds with elastic-tip
Posted in Computer, Docker, Linux, Networking, Security
Tagged docker, elastic, filebeat, ioc, kibana, monitoring, security, threatintelligence
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Elasticsearch in Docker: quick notes
Goals: single node elasticsearch single node kibana password for all accounts https between all components behind traefik future post: collect network logs (routers) future post: collect application logs (web servers, dns servers, docker) future post: collect application metrics future post: … Continue reading
Posted in Computer, Docker, Linux, Networking
Tagged docker, elastic, kibana, logstash, metrics, observability, search, traefik
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A Raspberry Pi, a UPS and a couple of ESXi servers walk into a bar
If you have the power of multiple servers connected to a UPS, you probably need to shut them down when the power goes down and before the UPS runs out of juice. Unless your UPS can be connected to the … Continue reading
Posted in Computer, Linux, Networking
Tagged debian, esxi, linux, raspberrypi, ups, vmware
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Tango Luxembourg using private IP addresses for Fiber internet access
When I moved in Luxembourg, I subscribed to Tango Luxembourg Fiber internet access. Back then, I got the usual dynamic public IP address “for free”. It was changing every 36 hours but at least it was a public one. Recently, … Continue reading
Posted in Computer, Luxembourg, Networking
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Gitlab-runner and docker behind a proxy
After reading many articles and trying many things, this is how I solved it. For docker daemon itself to use a proxy, configure environment variables using systemd file /etc/systemd/system/docker.service.d/http-proxy.conf : For gitlab-runner daemon itself to use a proxy, configure environment … Continue reading
IPsec tunnel between Ubuntu 20.04 and Mikrotik router using strongSwan
Here is how to establish an IPsec tunnel between an Ubuntu 20.04 host and a Mikrotik router using IKEv2. The 2 endpoints of the tunnel are: ubuntu.xentoo.info : the Ubuntu server. This server has a local private subnet 10.0.0.0/24 and … Continue reading
Posted in Computer, Linux, Mikrotik, Networking
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Using a Mikrotik router with Tango Fiber (Luxembourg)
Hi guys, I moved to Luxembourg and I have opted for Tango Fiber. Their router is a Fritz!box which I do not like at all. I have a spare Mikrotik router, so here is how to configure. Tango Fiber uses … Continue reading