[lwip-users] Re: reading and writing to the ethernet, unix port

[Kelvin Lawson]

> I have downloaded lwIP and successfully compiled it.  In the Linux port, 
> LWIP communicates
> over the network using the "TAP/TUN" device. 
>
> I have written a simple application using lwip_XXX() socket functions.  
> But nothing seems to work.  I debugged through the stack and found that, 
> the problem is inside the low_level_XXX() functions. 
> The read / write calls on the "/dev/net/tun" do not seem to receive / 
> send packets on the Ethernet.  I am stuck with this problem for quiet 

Do you have firewalling/iptables configured? That could be dropping your 
TAP packets.

Kelvin.