@@ -64,40 +64,29 @@ Your job will be to do the following:
in a triangle, each connected to one host (`h1`, `h2`, and `h3`).
* The hosts are assigned IPs of `10.0.1.1`, `10.0.2.2`, and `10.0.3.3`.
2. You should now see a Mininet command prompt. Open two terminals for `h1` and
`h2`, respectively:
```bash
mininet> xterm h1 h2
```
3. Each host includes a small Python-based messaging client and server. In
`h2`'s xterm, start the server:
```bash
python3 receive.py
```
4. First we will test without tunneling. In `h1`'s xterm, send a message to
`h2`:
```bash
python3 send.py 10.0.2.2 "P4 is cool"
```
The packet should be received at `h2`. If you examine the received packet
you should see that is consists of an Ethernet header, an IP header, a TCP
header, and the message. If you change the destination IP address (e.g. try
to send to `10.0.3.3`) then the message should not be received by `h2`, and
will instead be received by `h3`.
2. You should now see a Mininet command prompt. Open two terminals for `h1` and `h2`, respectively:
```bash
mininet> xterm h1 h2
```
3. Each host includes a small Python-based messaging client and server. In `h2`'s xterm, start the server:
```bash
python3 receive.py
```
4. First we will test without tunneling. In `h1`'s xterm, send a message to `h2`:
```bash
python3 send.py 10.0.2.2 "P4 is cool"
```
The packet should be received at `h2`. If you examine the received packet you should see that is consists of an Ethernet header, an IP header, a TCP header, and the message. If you change the destination IP address (e.g. try to send to `10.0.3.3`) then the message should not be received by `h2`, and will instead be received by `h3`.
5. Now we test with tunneling. In `h1`'s xterm, send a message to `h2`:
```bash
python3 send.py 10.0.2.2 "P4 is cool"--dst_id 2
```
The packet should be received at `h2`. If you examine the received packet you
should see that is consists of an Ethernet header, a tunnel header, an IP header,
a TCP header, and the message.
```bash
python3 send.py 10.0.2.2 "P4 is cool"--dst_id 2
```
The packet should be received at `h2`. If you examine the received packet you should see that is consists of an Ethernet header, a tunnel header, an IP header, a TCP header, and the message.
6. In `h1`'s xterm, send a message:
```bash
python3 send.py 10.0.3.3 "P4 is cool"--dst_id 2
```
The packet should be received at `h2`, even though that IP address is the address
of `h3`. This is because the switch is no longer using the IP header for routing
when the `MyTunnel` header is in the packet.
```bash
python3 send.py 10.0.3.3 "P4 is cool"--dst_id 2
```
The packet should be received at `h2`, even though that IP address is the address of `h3`. This is because the switch is no longer using the IP header for routing when the `MyTunnel` header is in the packet.
7. Type `exit` or `Ctrl-D` to leave each xterm and the Mininet command line.
> Python Scapy does not natively support the `myTunnel` header type so we have
