Specific IP data to a specific connection when multiple connections running

[ahmad.humyn]

Hello everyone

I am going through some trouble, which I cant figure out how to solve.
I have a computer which I have to connect to a VPN through dial-up,
which I havedone pretty easily. But I have to remotely access that same
machine through LAN. The problem is that the machine when connected
simultaneously to the LAN and the dial-up VPN, doesn't send the data to
the VPN and recieve from it like it should, instead I think it directs
the packets to the LAN.

But the good part of the problem (which I think will make it easier to
solve!) is that when I use the dial-up to connect to the VPN, I just
want communicate with a specific IP. I think the problem just boils
down to how to send data directed to a specific IP to a specific
network interface / connection.

Any ideas.
Thanks to anyone who can help me out.

Regards
Ahmad

 

[Kurt]

Does the LAN and the network on the other end of the VPN have the same
network number? If so, there's really no way to distinguish between the
destinations. What is the LAN IP address and the VPN virtual adapter IP
address? How about posting an "ipconfig /all" and a "route print" with both
connections active.

....kurt

 

[ahmad.humyn]

Okay here is the ipconfig /all. As you can see I have two completely
different adapters giving me to network interfaces. One is an ethernet
adapter connecting to the company's LAN and the other is a modem which
connects to another company's VPN using Dial-up.

Windows IP Configuration

Host Name . . . . . . . . . . . . : EP42
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . : xxxx.xxx.com.
Description . . . . . . . . . . . : Intel(R) PRO/100 VM Network
Connecti
on
Physical Address. . . . . . . . . : XX-XX-XX-XX-XX-XX (LAN card
MAC address)
Dhcp Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IP Address. . . . . . . . . . . . : 122.213.150.172
Subnet Mask . . . . . . . . . . . : 255.255.255.128
Default Gateway . . . . . . . . . : 122.213.150.129
DHCP Server . . . . . . . . . . . : 115.73.19.120
DNS Servers . . . . . . . . . . . : 135.63.24.231
135.63.1.19
Primary WINS Server . . . . . . . : 135.63.163.100
Secondary WINS Server . . . . . . : 135.63.176.100
Lease Obtained. . . . . . . . . . : Tuesday, August 15, 2006
9:32:26 AM
Lease Expires . . . . . . . . . . : Friday, August 18, 2006
9:32:26 AM

PPP adapter PIA Sabre VPN:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : WAN (PPP/SLIP) Interface
Physical Address. . . . . . . . . : XX-XX-XX-XX-XX-XX (Modem
MAC address)
Dhcp Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : 146.21.2.233
Subnet Mask . . . . . . . . . . . : 255.255.255.255
Default Gateway . . . . . . . . . : 146.21.2.233
DNS Servers . . . . . . . . . . . : 222.130.132.154
222.130.132.155
NetBIOS over Tcpip. . . . . . . . : Disabled

----------------------------------------------------
My problem is that any packet destined for the IP - 146.20.1.51 from
this machine should go through the modem (PPP adapter PIA Sabre VPN).
What should I do? Would any netsh command be useful?

Any ideas?

Regards

 

[Kurt]

I would have liked to have seen the output of "route print" also, but it
appears that the problem is likely the subnet mask on the PPP adapter (not
that there's anything wrong with it, just that Windows doesn't know what
traffic to send there). 255.255.255.255 is just one host, so windows will
route everything out the first default gateway in the routing table. I
suspect your routing table has two 0.0.0.0 entries, one for each of the
default gateways. So here's what I'd try. Open notepad and type this:

route delete 0.0.0.0
rem should delete both default routes
rem
route add 0.0.0.0 mask 0.0.0.0 122.213.150.129
rem re-establishes your primary default gateway
rem
route add 146.21.2.233 mask 255.255.255.0 146.21.2.233
rem you'll have to check on the actual network and subnet mask for the other
end of the VPN

Save the file as "setroute.bat" (don't forget to set the file type to "All
Files" in notepad before you save, or it'll be named setroute.bat.txt) and
put a shortcut to it on your dektop. Then launch the VPN. After it comes up,
run the batch file. See if you can ping stuff on the 146.21.2.0 network,

....kurt

 

[ahmad.humyn]

route print output --

===========================================================================
Interface List
0x1 ........................... MS TCP Loopback interface
0x60002 ...00 90 fb 06 b6 ed ...... Intel(R) PRO/100 VM Network
Connection - Pac
ket Scheduler Miniport
0x70004 ...00 53 45 00 00 00 ...... WAN (PPP/SLIP) Interface
===========================================================================
===========================================================================
Active Routes:
Network Destination Netmask Gateway
Interface Metric
0.0.0.0 0.0.0.0 122.213.150.129
122.213.150.172 21
0.0.0.0 0.0.0.0 146.21.2.233
146.21.2.233 1
127.0.0.0 255.0.0.0 127.0.0.1
127.0.0.1 1
122.213.150.128 255.255.255.128 122.213.150.172 122.213.150.172
20
122.213.150.172 255.255.255.255 127.0.0.1
127.0.0.1 20
122.213.255.255 255.255.255.255 122.213.150.172 122.213.150.172
20
146.21.2.230 255.255.255.255 146.21.2.233
146.21.2.233 1
146.21.2.235 255.255.255.255 127.0.0.1
127.0.0.1 50
146.21.255.255 255.255.255.255 146.21.2.233
146.21.2.233 50
224.0.0.0 240.0.0.0 122.213.150.172
122.213.150.172 20
224.0.0.0 240.0.0.0 146.21.2.233
146.21.2.233 1
255.255.255.255 255.255.255.255 122.213.150.172 122.213.150.172
1
255.255.255.255 255.255.255.255 146.21.2.233
146.21.2.233 1
Default Gateway: 146.21.2.233
===========================================================================
Persistent Routes:
None

Kurt thanks for the great imense help you have forwarded to me. But I
have an argument . I can see two routes 146.21.2.230 and
146.21.255.255 leading to the correct interface. Aren't those of any
help?

Anyways I'll try the trick you just sent and see what happens.
Thanks a bunch Kurt.

Regards

 

[ahmad.humyn]

Thanks a lot Kurt, you put me in the right direction. I solved the
problem by this command.

route ADD 146.20.1.51 MASK 255.255.255.255 146.21.2.233 if 0x70004

Which, I guess, just filters the packets of this specific IP to the
interface 0x70004, the modem interface as you can see from route
print's output.

Thanks a bunch. Learned something really useful

Regards