Jacob TCP/IP Stack

Building Instructions

Ensure that the tap device is initialized and created.

sudo mknod /dev/net/tap c 11 201 && sudo chmod 0666 /dev/net/tap

Emulation

While currently in the root folder, run the command:

make

Change directory to the bin folder and run the command:

sudo ./arp

On a separate terminal, run the command:

sudo arping -I tap0 10.0.0.4

Debugging

For debugging purposes, I had run wireshark. I had to ensure:

• The tap0 device was sending a broadcast with MAC address ff:ff:ff:ff:ff
• The tap0 device received a reply back with an appropriate MAC address

Results

After running all the commands you should get a ARP reply as such:

ARPING 10.0.0.4
42 bytes from 00:0c:29:6d:50:26 (10.0.0.4): index=0 time=88.998 usec
42 bytes from 00:0c:29:6d:50:26 (10.0.0.4): index=1 time=80.562 usec
42 bytes from 00:0c:29:6d:50:26 (10.0.0.4): index=2 time=78.478 usec
42 bytes from 00:0c:29:6d:50:26 (10.0.0.4): index=3 time=92.948 usec
42 bytes from 00:0c:29:6d:50:26 (10.0.0.4): index=4 time=72.797 usec
42 bytes from 00:0c:29:6d:50:26 (10.0.0.4): index=5 time=79.489 usec
42 bytes from 00:0c:29:6d:50:26 (10.0.0.4): index=6 time=84.717 usec