Re: [lwip-users] connect tap device to the Internet

[Sergio R. Caprile]

That shouldn't be a problem providing you configure things right.
Are you using Linux, Windoze, MacOS ???
Check a TUN/TAP primer for your OS

In Linux you can configure TUN/TAP for bridging or routing, depending on
which interface type you have. I prefer routing, so your TUN/TAP and
lwIP will be on a network, the TUN/TAP address will be lwIP's default
gateway and the rest of your machine(s) will be in other network(s).
Your machine hosting lwIP will have to be able to route.
Check a routing primer for your OS

In my machine, I connect via PPPoE through eth1, tap0 connects to lwIP
using the examples from 1.4.1

address@hidden ~]$ /sbin/ifconfig
eth0      Link encap:Ethernet
          inet addr:192.168.69.1  Bcast:192.168.69.255  Mask:255.255.255.0
eth1      Link encap:Ethernet
          inet addr:192.168.10.2  Bcast:192.168.10.255  Mask:255.255.255.0
ppp0      Link encap:Point-to-Point Protocol
          inet addr:181.26.199.74  P-t-P:200.63.148.219
Mask:255.255.255.255
tap0      Link encap:Ethernet
          inet addr:192.168.0.1  Bcast:192.168.0.255  Mask:255.255.255.0
lwIP
  /* startup defaults (may be overridden by one or more opts) */
  IP4_ADDR(&gw, 192,168,0,1);
  IP4_ADDR(&ipaddr, 192,168,0,2);
  IP4_ADDR(&netmask, 255,255,255,0);