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content/blog/miscellaneous/nmap.md
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content/blog/miscellaneous/nmap.md
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---
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title: "Some nmap common usages"
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date: 2021-03-19
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description: nmap command examples
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tags:
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- toolbox
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---
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## Introduction
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Too often I have to go through the man page to remember the flags I need, so here is a little summary.
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## The commands
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- Initiate a detailed host scan : ''nmap -v -sV -O serveraddr''
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- Initiate a ping scan without port scan : ''nmap -sn 10.1.0.0/24''
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- The same ping scan with greppable output : ''nmap -sn -oG - 10.0.33.0/24''
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content/blog/miscellaneous/reusing-ssh-connections.md
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content/blog/miscellaneous/reusing-ssh-connections.md
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---
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title: Reusing ssh connections
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date: 2020-02-05
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description: How to speed up opening multiple ssh to a single host
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tags:
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- toolbox
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---
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## Introduction
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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.
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## How to
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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` :
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{{< highlight sh >}}
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ControlMaster auto
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ControlPath ~/.ssh/tmp/%h_%p_%r
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{{< /highlight >}}
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content/blog/miscellaneous/tc.md
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content/blog/miscellaneous/tc.md
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---
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title: Traffic shaping with tc
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date: 2019-09-17
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description: How to use the tc command to shape traffic on linux
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tags:
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- linux
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---
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## How to
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{{< highlight sh >}}
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tc qdisc show dev eth0
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tc qdisc add dev eth0 root netem delay 200ms
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tc qdisc show dev eth0
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tc qdisc delete dev eth0 root netem delay 200ms
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tc qdisc show dev eth0
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{{< /highlight >}}
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## References
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- https://www.badunetworks.com/traffic-shaping-with-tc/
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