Continued importing some old wiki content

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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''

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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 >}}

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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/