Share internet via notebook VPN through ad-hoc for other device;

Question

I'd like to make netbook work as ad-hoc and here's the problem: smartphone (i5700) connects to netbook via wifi, the internet (vpn) connection is shared with wifi connection but there's no internet on smartphone;
Devices:

1. Netbook -- acer D250-0BQk WinXP Home Edition SP3;
2. Apple ipod 4th gen iOS 5;
3. Samsung i5700 (2.2, custom kernel);

"Topology":
The netbook is in local network and get internet connection via VPN;
Ipod or phone is connected to netbook via WIFI;

ipconfig /all on netbook:

IP Configuration for Windows

    The name of the computer. . . . . . . . . : ACERBOTTED
    The primary DNS-suffix. . . . . . :
    Node Type. . . . . . . . . . . . . : Unknown
    IP-routing is enabled. . . . : Yes
    WINS-proxy enabled. . . . . . . : No

Local Area Connection 2 - Ethernet adapter:

    DNS-Suffix. . : Beeline
    Description. . . . . . . . . . . . : Atheros AR8132 PCI-E Fast Ethernet Controller        
    Dhcp enabled. . . . . . . . . . . : Yes
    Autoconfiguration Enabled. . . . . : Yes
    IP-address. . . . . . . . . . . . : 10.89.76.1
    The subnet mask. . . . . . . . . . : 255.255.248.0
    Default Gateway. . . . . . . . . . : 10.89.72.1
    DHCP-server. . . . . . . . . . . : 78.107.63.213
    DNS-servers. . . . . . . . . . . : 85.21.192.3
                                        213.234.192.8
    Rent is received. . . . . . . . . : January 12, 2012 12:46:33
    Lease expires. . . . . . . . . : January 19, 2012 12:46:33

Wireless Connection - Ethernet adapter:

    DNS-Suffix. . :
    Description. . . . . . . . . . . . : Atheros AR5B95 Wireless Network Adapter
    Dhcp enabled. . . . . . . . . . . : No
    IP-address. . . . . . . . . . . . : 192.168.0.1
    The subnet mask. . . . . . . . . . : 255.255.255.0
    Default Gateway. . . . . . . . . . :
    DNS-servers. . . . . . . . . . . : 213.234.192.7
                                        85.21.192.3
                                        213.234.192.8
                                        195.14.50.1
                                        8.8.8.8
                                        127.0.0.1

beeline - PPP adapter:

    DNS-Suffix. . :
    Description. . . . . . . . . . . . : WAN (PPP / SLIP) Interface        
    Dhcp enabled. . . . . . . . . . . : No
    IP-address. . . . . . . . . . . . : 95.24.177.194
    The subnet mask. . . . . . . . . . : 255.255.255.255
    Default Gateway. . . . . . . . . . : 95.24.177.194
    DNS-servers. . . . . . . . . . . : 213.234.192.7
                                        195.14.50.1

The device (one of ipod or phone) successfully connects to netbook.
It get ip configs with DHCP (i also tried to input them staticly):
ip: 192.168.0.2
submask: 255.255.255.0
gateway: 192.168.0.1
dns: 192.168.0.1

I can ping 192.168.0.2 and 192.168.0.1 from netbook but i cannot ping 192.168.0.1 from connected through wifi device (e.g. phone); It looks like one way traffic tunnel;
The firewalls are disabled (windows' and nod's);

Any suggestions what's wrong?

Answer 1

When you used ICS, did you set it up from the VPN's properties or your PPPoE connection's? You should always do it from the "logical" connection that should be shared (i.e. the VPN) instead of the "physical" connection it runs on.

Several other things to consider:

• ICS may not be working until the VPN is connected, so don't connect any WIFI clients until the VPN is on.
• You should not use the network bridge feature as it works at a totally different stack layer and cannot be used for VPN sharing generally. (What you need here is to share one line and one IP to multiple computers, which is NAT which is what ICS does.)
• ICS also functions as a DHCP server and DNS server, so it will setup the "shared to" interface (i.e. your wireless card) to the 192.168.x.1 IP and send out DHCP packets that sets it as the default gateway and DNS.
  • Due to this, you should change the settings of the "shared to" interface after ICS has been setup. If you did, you'll have to disable ICS and setup it up again.
  • I don't think the default IP subnet is 192.168.0.1, did you change that?
• You may need to configure your firewall for the NAT router and DNS server to work.
• Your VPN provider may be preventing ICS by checking the TTL of the packets, in which case ICS can't be used.

Answer 2

obs: Netbook not answering ping does not always mean that the connection is not established because windows machine often do not answer ping as the firewall can block it.

Not sure if this is the unique problem but how can your smartphone get 192.168.0.2 IP if DHCP in wifi adapter on netbook is OFF? Or is it an old config? You should turn it on and let it send default gateway and DNS relay to the smartphone's subnet for it to connect to internet.

Why don't you only bridge your LAN 2 (ethernet card) with Wifi adapter on netbook and it will do the job like if the smartphone were in the working LAN?