Hi Robert & Alan,
Although I don't have an ESP32 board yet, you may need NAT applied on wlan0, I
guess.
Under Alan's configuration, there are two subnets: the 192.168.0.0/24 and
10.0.0.0/24. With only routing and ipforward, the ping from 10.0.0.x (take
10.0.0.2 as an example) normally can reach the router (192.168.0.1), but the
router doesn't know where 10.0.0.2 is, and it may just reply via its default
route (packet may be sent to the internet, or dropped by the router's firewall).
The router's default route (normally the Internet)
↑ reply: 192.168.0.1 -> 10.0.0.2
----------
| Router |
----------
↑ ping: 10.0.0.2 -> 192.168.0.1
----------
| ESP32 | <- Just forward
----------
↑ ping: 10.0.0.2 -> 192.168.0.1
----------
| Device |
----------
You may try NAT with CONFIG_NET_NAT and CONFIG_SYSTEM_IPTABLES enabled, using
the command 'iptables -t nat -A POSTROUTING -o wlan0 -j MASQUERADE' to apply
NAT to all outbound traffic on wlan0, then you may get:
----------
| Router |
----------
↑ ping: 192.168.0.7 -> 192.168.0.1
↓ reply: 192.168.0.1 -> 192.168.0.7
----------
| ESP32 | <- Doing NAT, mapping 10.0.0.2 to 192.168.0.7
----------
↑ ping: 10.0.0.2 -> 192.168.0.1
↓ reply: 192.168.0.1 -> 10.0.0.2
----------
| Device |
----------
Hope this may help.
BTW, It's my first time replying to this mailing list, I'm not sure if I'm
doing it correctly.
Best regards,
Zhe Weng
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