How to set up native posix board to allow connections to the Internet?

[overheat]

Hi,

Socket HTTP GET Example require connections to the Internet. But how to do for native posix board? :)

Thanks!

[jukkar]

See https://docs.zephyrproject.org/latest/guides/networking/qemu_setup.html#setting-up-zephyr-and-nat-masquerading-on-host-to-access-internet for details. That guide talks about QEMU but the same things apply to native-posix.

[overheat]

See https://docs.zephyrproject.org/latest/guides/networking/qemu_setup.html#setting-up-zephyr-and-nat-masquerading-on-host-to-access-internet for details. That guide talks about QEMU but the same things apply to native-posix.

Hi @jukkar,
As the "set the CONFIG_NET_CONFIG_MY_IPV4_GW option to the IP address of the gateway."
the IP address of the gateway is my physical router IP address, which is 192.168.0.1? or my zeth interface IP address, which is 192.0.2.2

After setting CONFIG_NET_CONFIG_MY_IPV4_GW to my zeth interface IP address(192.0.2.2). I can ping 192.168.5.141(host IP, my PC) successfully, but ping 192.168.0.1(router IP) failed.
How to bridge(NAT) to my wlan network, which is 192.168.0.0/20, to access Internet?

Thanks.

[jukkar]

The GW address is suppose to be your network gateway address, so 192.168.0.1 in this case.

[overheat]

@jukkar
I have setup zephyr as you suggested, GW=192.168.0.1, iptables and so on.
Ping my gateway and grab zeth interface traffic on Linux host using wireshark, like this:

Still not work. Any suggestion?
BTW, iptables like this:

$ sudo iptables -t nat -L

...
Chain POSTROUTING (policy ACCEPT)
target     prot opt source               destination         
MASQUERADE  all  --  bogon/16             anywhere            
MASQUERADE  all  --  192.0.2.1            anywhere            
MASQUERADE  all  --  192.0.2.2            anywhere  

And zephyr native posix board arp got same MAC address for both 192.0.2.2 and 192.168.0.1.

uart:~$ net arp
     Interface  Link              Address
[ 0] 0x56600dc0 00:00:5E:00:53:FF 192.168.0.1
[ 1] 0x56600dc0 00:00:5E:00:53:FF 192.0.2.2

Thanks.

[jukkar]

And zephyr native posix board arp got same MAC address for both 192.0.2.2 and 192.168.0.1.

uart:~$ net arp
     Interface  Link              Address
[ 0] 0x56600dc0 00:00:5E:00:53:FF 192.168.0.1
[ 1] 0x56600dc0 00:00:5E:00:53:FF 192.0.2.2

That does not look right. You have something wrong in your host setup but it is very difficult to debug this remotely via github issue.

[overheat]

@jukkar
It works after I disable the firewall on my Kali Linux by ufw disable, looks the ufw disabled the ip forwording default. alternately, change the config of ufw to allow ip forwarding should works.
BTW, the gate way is "192.0.2.2"