# *nix Networking Tools Cheat Sheet

## Packet and Firewall filtering

### pfctl + dnctl (MacOSX Yosemite+)


```
(cat /etc/pf.conf && echo "dummynet-anchor \"mop\"" && echo "anchor \"mop\"") | sudo pfctl -f -
echo "dummynet in quick proto tcp from any to any port 5001 pipe 1" | sudo pfctl -a mop -f -
sudo dnctl pipe 1 config bw 1Mbit/s
```

To undo...
```
sudo dnctl -q flush
sudo pfctl -f /etc/pf.conf
```

Observe traffic is now shaped to 100Mbit/s:

```
iperf  -s -D # Run as Daemon (-D)
iperf -c localhost -t 5 
```

> ------------------------------------------------------------
> Client connecting to localhost, TCP port 5001
> TCP window size:  144 KByte (default)
> ------------------------------------------------------------
> [  5] local 127.0.0.1 port 59573 connected with 127.0.0.1 port 5001
> [ ID] Interval       Transfer     Bandwidth 
> [  5]  0.0- 5.0 sec  60.5 MBytes   101 Mbits/sec 

### ipfw (FreeBSD/OpenBSD)

### iptables (Linux)

## Network Performance 

### iperf (all)

I perf

Setup the server:

```
iperf -s
```

Run the client against the server for 7 seconds:

```
iperf -c localhost -t 7
```

You should get a throughput in (GMk)bits/sec


## Links

* https://gist.github.com/tracphil/4353170
*