Reply To: Tcpip routing forward question?

[hoowaycn]

Oh, understand, thanks.

Followed your suggestion.

I do this, print all caught packet, NOT do any address subsititute action
Just want to know I can catch that packet at external interface.

/// set flag MSTCP_FLAG_SENT_TUNNEL|MSTCP_FLAG_RECV_TUNNEL

if (PacketBuffer.m_dwDeviceFlags == PACKET_FLAG_ON_SEND)
{
/// tcpstack –> interface

print(“tcpstack — > interface: %s”, interfaceName );
for(i=0;i print(“%x: rn” , PacketBuffer.m_IBuffer);
}

if (PacketBuffer.m_dwDeviceFlags == PACKET_FLAG_ON_RECV)
{
/// interface — > tcpstack

print(“interface —> tcpstack: %s”, interfaceName );
for(i=0;i print(“%x: rn” , PacketBuffer.m_IBuffer);
}

I do a “ping 218.30.103.40” at the client computer, as the the correct result I should catch the packet at “TcpStack –> Interface: External”, but failed.
I only get it at “Interface –> Stack: Internal”. As you have told before, I
should get the packet at “TcpStack –> Interface: External”. Can you tell me where the error from?

My environment is like below

internet —- adsl modem — HUB

---

inner client( 192.168.1.3)
|
NAT computer (192.168.1.2 WinXP)

NAT computer use RasPPPoE to connect ADSL.

Below is my route table

=====================================
Interface List
0x1 ……………………… MS TCP Loopback interface
0x2 …00 50 ba 63 2b bd …… VIA Compatable Fast Ethernet Adapter
0x40004 …00 53 45 00 00 00 …… WAN (PPP/SLIP) Interface
=====================================
Active Routes:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 61.50.227.147 61.50.227.147 1
61.50.227.147 255.255.255.255 127.0.0.1 127.0.0.1 50
61.149.96.1 255.255.255.255 61.50.227.147 61.50.227.147 1
61.255.255.255 255.255.255.255 61.50.227.147 61.50.227.147 50
127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1
192.168.1.0 255.255.255.0 192.168.1.2 192.168.1.2 20
192.168.1.2 255.255.255.255 127.0.0.1 127.0.0.1 20
192.168.1.255 255.255.255.255 192.168.1.2 192.168.1.2 20
224.0.0.0 240.0.0.0 192.168.1.2 192.168.1.2 20
224.0.0.0 240.0.0.0 61.50.227.147 61.50.227.147 1
255.255.255.255 255.255.255.255 192.168.1.2 192.168.1.2 1
Default Gateway: 61.50.227.147
============================
Persistent Routes:
None

Here is one packet I caught

interface–>tcpstack Local Connection (Internel)
0: 50: ba: 63: 2b: bd: 0: 10: dc: 1: b8: 9f: 8: 0: 45: 0:
0: 3c: 38: cf: 0: 0: 80: 1: fe: ff: c0: a8: 1: 3: da: 1e:
67: 28: 8: 0: 29: 5c: 2: 0: 22: 0: 61: 62: 63: 64: 65: 66:
67: 68: 69: 6a: 6b: 6c: 6d: 6e: 6f: 70: 71: 72: 73: 74: 75: 76:
77: 61: 62: 63: 64: 65: 66: 67: 68: 69:

This is a ICMP Echo Req packet