wiki/en/fpv-openipc-aio-internet-forwarding.md

AIO Mario firmware update over usb via internet forwarding

This method will work on Linux due to specific network commands. The key idea is to use the local PC as a network bridge betwen AIO board ethernet interface and your local internet interface.

Steps

1. Connect AIO Mario to USB
2. Identify your PC address. On your local PC run:

ip -c a
...
3: enx00e099fead02: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:e0:99:fe:ad:02 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.11/24 brd 192.168.1.255 scope global noprefixroute enx00e099fead02
       valid_lft forever preferred_lft forever
    inet6 fe80::de74:78fc:9af0:f031/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

Here: 192.168.1.11 is my local PC address on AIO ethernet interface.

3. Connect to AIO Mario over ssh. On PC:

ssh root@192.168.1.10

4. List AIO routes. On AIO run:

root@openipc-ssc338q:~# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 eth0

5. We need to add a route to our local PC, so traffic could get route over. On AIO run:

root@openipc-ssc338q:~# route add default gw 192.168.1.11 eth0

Here: 192.168.1.11 is the local PC address.

6. Verify that route was added correctly:

root@openipc-ssc338q:~# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.1.11    0.0.0.0         UG    0      0        0 eth0
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 eth0

7. On the local PC we need to forward all the traffic from enx00e099fead02 AIO Mario ethernet interface to our local connection. This can be wlp2s0 for wifi. To check the interface name, on the local PC run again:

ip -c a
2: wlp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether f8:34:41:af:55:37 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.8/24 brd 192.168.1.255 scope global noprefixroute wlp2s0
       valid_lft forever preferred_lft forever
    inet6 fe80::8d6a:f2f6:c850:cf9d/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

Here: wlp2s0 is my internet connection, it could be also eth0 on other setups.

8. Traffic forwarding. Create a bash script ~/forward.sh:

#!/bin/bash

# Get the interface name of the wireless card by stdin
# $1 is the interface name of the AIO card

USB_AIO=$1
INTERNET_IF=$2

sudo iptables -A FORWARD -i $USB_AIO -o $INTERNET_IF -j ACCEPT
sudo iptables -A FORWARD -i $INTERNET_IF -o $USB_AIO -m state --state RELATED,ESTABLISHED -j ACCEPT
sudo iptables --table nat -A POSTROUTING -o $INTERNET_IF -j MASQUERADE

This script will receive as input $1 the AIO ethernet interface, and forward the traffic to $2.

Enable IP forwading by editing /etc/sysctl.conf on your local PC and adding:

net.ipv4.ip_forward = 1

And enable the changes with:

sudo sysctl -p /etc/sysctl.conf

on Debian/Ubuntu systems this can be also done restarting the procps service:

sudo /etc/init.d/procps restart

9. Run the script on your local PC:

chmod u+x ./forward.sh
sudo ./forward.sh enx00e099fead02 wlp2s0

Here: enx00e099fead02 is AIO ethernet interface, and wlp2s0 local PC interface.

10. On AIO Mario we need to configure DNS servers. Edit /etc/resolv.conf and add:

nameserver 8.8.8.8
nameserver 8.8.4.4

11. Test internet acces. On AIO run ping 8.8.8.8 and ping openipc.org:

root@openipc-ssc338q:~# ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8): 56 data bytes
64 bytes from 8.8.8.8: seq=0 ttl=116 time=23.611 ms
64 bytes from 8.8.8.8: seq=1 ttl=116 time=28.683 ms
^C
--- 8.8.8.8 ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max = 23.611/26.147/28.683 ms
root@openipc-ssc338q:~# ping openipc.org
PING openipc.org (5.161.116.152): 56 data bytes
64 bytes from 5.161.116.152: seq=0 ttl=51 time=290.381 ms
64 bytes from 5.161.116.152: seq=1 ttl=51 time=207.881 ms
64 bytes from 5.161.116.152: seq=2 ttl=51 time=232.049 ms
^C
--- openipc.org ping statistics ---
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max = 207.881/243.437/290.381 ms

12. Update firmware:

root@openipc-ssc338q:~# sysupgrade -r -k -n --force_ver
OpenIPC System Updater v1.0.41

Vendor	sigmastar
SoC	ssc338q
Kernel	03:35:18 2024-09-27
RootFS	master+d69195a, 2024-09-27

Synchronizing time
ntpd: setting time to 2024-09-28 00:05:42.525372 (offset +73821.493151s)
Sat Sep 28 00:05:42 GMT 2024

Checking for sysupgrade update...
Same version. No update required.

Stop services, sync files, free up memory
Stopping crond: OK
Stopping ntpd: OK
Stopping klogd: OK
Stopping syslogd: OK
...