Running on Vagrant

If you have Vagrant installed, you can run the above example with the following commands.

In a terminal (terminal 1), bring up the Vagrant box:
```
$ vagrant up
```
This will take a few minutes to download and provision the box.
Connect to the Vagrant box:
```
$ vagrant ssh
```
Build pwru:
```
$ cd /pwru
$ make
```

Run pwru:

$ sudo ./pwru --output-tuple 'dst host 1.1.1.1 and dst port 80 and tcp'

In a new terminal (terminal 2), connect to the Vagrant box:
```
$ vagrant ssh
```
In terminal 2, run curl to generate some traffic to 1.1.1.1:
```
$ curl 1.1.1.1
```
Observe the output of pwru in terminal 1.

In terminal 2, add an iptables rule to block traffic to 1.1.1.1:

$ sudo iptables -t filter -I OUTPUT 1 -m tcp --proto tcp --dst 1.1.1.1/32 -j DROP

In terminal 2, run curl to generate some traffic to 1.1.1.1:
```
$ curl 1.1.1.1
```
Observe the output of pwru in terminal 1.
To clean up, press Ctrl+C to terminate pwru in terminal 1, exit both shells, and run:
```
$ vagrant destroy
```