Setting up a VPN
This week we had to set up a simulated VPN using at least 4 Subnets using 140.20.0.0 (a class B) as our IP address.
For this lab our network used 3 Routers with cables that could simulate the speeds used by an ISP, as if the routers were located in deferent parts of the world. On each side of the router was a switch (So we used 2 switches)
The first thing we had to sort out is how many host bits we would need to get closest to the 4 SN we needed. In this case it was 3, (23-2=6). That would made our subnet mask
111 00000.00000000 = 255.255.224.0 Subnet mask
| 128 | 64 | 32 | 16 | 8 | 4 | 2 | 1 |
| 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 |
| 128 | 64 | 32 | 16 | 8 | 4 | 2 | 1 |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The side of the class I was on was assigned the 4th subnet, and I was assigned the 4th IP address on that subnet.
011 00000.00000100 = 140.20.96.3 My IP address
| 128 | 64 | 32 | 16 | 8 | 4 | 2 | 1 |
| 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 |
| 128 | 64 | 32 | 16 | 8 | 4 | 2 | 1 |
| 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 |
Just like the switch lab we have to configure our computers with the proper IP address.
See image Setting up the IP
Next we watched as the instructor set up the routers using “putty”. It was really neat see all the commands used.
Please check out my video on how this was done.
Once we got everything setup we had to ping the other students. Just like in the switch lab other students were unable to ping me. This time I was able to fix it. I had to turn windows firewall ON then turn it off, then other students were able to ping me.
My ping(s) Screen shot.
