RPI and TUN - Link two RPi together via TCP/IP

[epsi1on]

Hi,
I would like to make a network link of two RPI via rf24 (TCPIP link).
i did successfully ran the /RF24/examples_linux/gettingstarted on both devices, both can send and receive data successfully.

To setup network link, this is what i did ran:

Machine 1 (IP: 10.11.2.2/24)

sudo ip tuntap add dev tun_nrf24 mode tun user pi multi_queue
sudo ifconfig tun_nrf24 10.11.2.2/24

sudo sysctl -w net.ipv4.ip_forward=1
sudo iptables -t nat -A POSTROUTING -j MASQUERADE

Machine 2 (IP: 10.11.2.3/24)

sudo ip tuntap add dev tun_nrf24 mode tun user pi multi_queue
sudo ifconfig tun_nrf24 10.11.2.3/24

sudo sysctl -w net.ipv4.ip_forward=1
sudo iptables -t nat -A POSTROUTING -j MASQUERADE

after running the RF24Gateway_ncurses file on both PIs, this is result:
machine 1:

machine 2:

Finally i would like to be able to ping machine 2 from machine 1 and vise versa.

But when i try to ping 10.11.2.3 from machine 1, there is no response from machine 2. I definitely think i'm missing something but cannot figure it out. :) Could you please tell me what am i missing?

Thanks in advance

[TMRh20]

First off you probably don’t need to call the sysctl or iptables functions. Those are mainly needed for routing internal rf24 network traffic to external sources. You may want to keep. Second you will need to choose a master node. All other nodes need to be assigned nodeIDs. See line 99 of the ncurses example. ‘uint8_t nodeID =22;’ You will want to match this to the last octet of the nodes IP address. So let’s say 10.11.2.2 is master. You want to set the nodeid on 10.11.2.3 to 3 on line 99, Then on line 100 call ‘gw.begin(nodeID);’

[epsi1on]

Kindly thanks for the information.
It did solve the problem, now i can ping machines via NRF links. the speed is about 10KBps which is more than enough for my application.
I did not tested yet, but do you think that using UDP will increase the speed for transferring audio or video?
Thanks again for great library.

[TMRh20]

Thanks @epsi1on

Yes I think UDP would be faster. I typically get speeds up to ~20KBps, but 10 is probably a good average.

[epsi1on]

Thanks