Hi, I am using Android 10 on a custom device. The Android image has been
generated by AOSP.
I need to forward the traffico from the eth0 to the ppp0 (LTE module)
interface.
I've managed to enable the ppp0 interface by using the pppd script (i.e.:
`pppd call my-connection-info`) and I can see that I receive the two DNS
server addresses and my public IPv4 successfully.
Now the first weird thing: If I ping to 8.8.8.8 I receive "connect: Network
is unreachable" meanwhile if I specify the ppp0 interface with `ping -I
ppp0 8.8.8.8` I can successfully ping the target.
Now I want to forward the eth0 traffic to the ppp0, to do so I've tried the
following commands:
$ echo 1 > /proc/sys/net/ipv4/ip_forward
$ iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE
But the PC on the other end of the eth0 interfce still prompts "From
192.168.10.1 icmp_seq=xxx Destination Net Unreachable" where 192.168.10.1
address is the Android device (which acts like a gateway).
This is the content of `netstat -rn` command:
* Kernel IP routing table*
* Destination Gateway Genmask Flags MSS Window irtt Iface*
* 0.0.0.0 10.64.64.64 0.0.0.0 UG 0 0
0 ppp0*
* 10.64.64.64 0.0.0.0 255.255.255.255 UH 0 0
0 ppp0*
* 192.168.10.0 0.0.0.0 255.255.255.0 U 0 0
0 eth0*
This is the output of `netstat -rn`:
* default via 10.64.64.64 dev ppp0 *
* 10.64.64.64 dev ppp0 proto kernel scope link src 10.53.117.129 *
* 192.168.10.0/24 dev eth0 proto kernel scope link src 192.168.10.1 *
This is the output of `iptables -L` (which I've flushed with `iptables -F`,
`iptables -X` and `iptables -t nat -F`):
* Chain INPUT (policy ACCEPT)*
* target prot opt source destination *
* Chain FORWARD (policy ACCEPT)*
* target prot opt source destination *
* Chain OUTPUT (policy ACCEPT)*
* target prot opt source destination*
Which is the issue here? Thank you.
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