Is it possible to get an bidirectional IP-tunnel over ttyS0-like serial (modem) devices with the **socat** utility? I tried to use TUN option but still can't get the result.

Any suggestions are welcome :)

*Update:*

PC1:

```
socat /dev/ttyUSB0,raw,echo=0,b57600,clocal TUN:192.168.1.1/24,up

```

PC2:

```
socat /dev/ttyUSB0,raw,echo=0,b57600,clocal TUN:192.168.1.2/24,up

```

After that, I have seen tun0 interfaces with proper addresses on both ends but I can't ping one from other. Instead of that, when I send data with `ping -c 1 192.168.1.1` remote `socat` process exits and it's tun0 device destroyed. Any suggestions?..

*Update2:*

There is a framing problem when we try to make TCP/IP tunnel over serial with only socat. Gerhard Rieger, the socat's developer, says me that:

> 
> I am afraid that you are right. tun
>  over datagram socket works, and - by
>  luck - also over pipes. But over the
>  serial line the packet boundaries may
>  vanish and this is fatal when sending
>  the data out on the tun interface.
> 
> 
> I cannot offer a socat based solution
>  now, sorry. However, I will try to
>  integrate some framing in a later
>  version 2 release.
> 
> 
>