Continued importing some old wiki content

content/blog/miscellaneous/nmap.md

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+---
+title: "Some nmap common usages"
+date: 2021-03-19
+description: nmap command examples
+tags:
+  - toolbox
+---
+
+## Introduction
+
+Too often I have to go through the man page to remember the flags I need, so here is a little summary.
+
+## The commands
+
+- Initiate a detailed host scan : ''nmap -v -sV -O serveraddr''
+- Initiate a ping scan without port scan : ''nmap -sn 10.1.0.0/24''
+- The same ping scan with greppable output : ''nmap -sn -oG - 10.0.33.0/24''

content/blog/miscellaneous/reusing-ssh-connections.md

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+---
+title: Reusing ssh connections
+date: 2020-02-05
+description: How to speed up opening multiple ssh to a single host
+tags:
+  - toolbox
+---
+
+## Introduction
+
+It is possible to share multiple sessions over a single connection. One of the advantages is that for the duration of the connection, all new sessions open very fast.
+
+## How to
+
+You need a directory to store the sockets for the opened sessions, I use the `~/.ssh/tmp` directory for it. Whatever you choose, make sure it exists by running `mkdir` now. Then add these two lines at the start of your `~/.ssh/config` :
+{{< highlight sh >}}
+ControlMaster auto
+ControlPath   ~/.ssh/tmp/%h_%p_%r
+{{< /highlight >}}

content/blog/miscellaneous/tc.md

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+---
+title: Traffic shaping with tc
+date: 2019-09-17
+description: How to use the tc command to shape traffic on linux
+tags:
+  - linux
+---
+
+## How to
+
+{{< highlight sh >}}
+tc qdisc show dev eth0
+tc qdisc add dev eth0 root netem delay 200ms
+tc qdisc show dev eth0
+
+tc qdisc delete dev eth0 root netem delay 200ms
+tc qdisc show dev eth0
+{{< /highlight >}}
+
+## References
+
+  - https://www.badunetworks.com/traffic-shaping-with-tc/