Vista - 2 LAN Card Problem

I have 2 LAN Cards on my pc...

both the card is internet line but i use 1 for internet and another for lan (p2p)..

i can use this configuration but not putting the default gateway in the card which i am using for lan. so, all the request is transferred to another card which i use for internet...

but now, my ISP is changed. it uses PPPOE connection which i use for lan. i have to connect PPPOE dialup connection, for using my lan, but the internet is disconnected from other card.

Details of the cards :

Ethernet adapter Realtek OnBoard (internet) :

Connection-specific DNS Suffix . :
IPv4 Address. . . . . . . . . . . : 172.16.3.3
Subnet Mask . . . . . . . . . . . : 255.255.0.0
Default Gateway . . . . . . . . . : 172.16.250.250

Ethernet adapter Realtek Internal (LAN with PPPOE):

Connection-specific DNS Suffix . :
IPv4 Address. . . . . . . . . . . : 10.0.104.75 (can be got by DHCP also)
Subnet Mask . . . . . . . . . . . : 255.0.0.0
IPv4 Address. . . . . . . . . . . : 192.168.104.75
Subnet Mask . . . . . . . . . . . : 255.255.0.0
Default Gateway . . . . . . . . . : (192.168.104.1) i am not putting this for using internet from other card

please help me out

thank you

What are you hoping to achieve by running two NICs on the same network segment? In the vast majority of cases, that's not a good idea.

i have 2 different ISP's.
i have taken 1 mainly for LAN i.e. for file sharing and other for internet becoz it provides me good speed. thats the problem

Sorry, I'm still not sure that I understand, but I'm guessing the introduction of PPPoE has knocked out your ability to route some traffic via NIC1, while the rest goes via NIC2?

Can you paste the output of ROUTE PRINT when the machine is connected via PPPoE?

===========================================================================
Interface List
47 ........................... 11 ...00 1b 2f fd ff 2f ...... Realtek RTL8169/8110 Family PCI GBE NIC
10 ...00 50 bf 34 55 90 ...... Realtek RTL8139/810x Family Fast Ethernet NIC
1 ........................... Software Loopback Interface 1
15 ...00 00 00 00 00 00 00 e0 isatap.{AAE340F6-3DF8-4D5A-AA24-6ECD75DD6A75}
12 ...00 00 00 00 00 00 00 e0 isatap.{06DB4DE4-8B50-424F-87B5-2A2A60C4342C}
14 ...00 00 00 00 00 00 00 e0 isatap.{9DFA3B5D-1560-4C55-8989-EF985DBA6D36}
16 ...00 00 00 00 00 00 00 e0 6TO4 Adapter
17 ...02 00 54 55 4e 01 ...... Teredo Tunneling Pseudo-Interface
===========================================================================

IPv4 Route Table
===========================================================================
Active Routes:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 172.16.250.250 172.16.3.40 4501
0.0.0.0 0.0.0.0 On-link 172.16.104.75 21
10.0.0.0 255.0.0.0 On-link 10.0.104.75 4501
10.0.104.75 255.255.255.255 On-link 10.0.104.75 4501
10.255.255.255 255.255.255.255 On-link 10.0.104.75 4501
127.0.0.0 255.0.0.0 On-link 127.0.0.1 4531
127.0.0.1 255.255.255.255 On-link 127.0.0.1 4531
127.255.255.255 255.255.255.255 On-link 127.0.0.1 4531
172.16.0.0 255.255.0.0 On-link 172.16.3.40 4501
172.16.3.40 255.255.255.255 On-link 172.16.3.40 4501
172.16.104.75 255.255.255.255 On-link 172.16.104.75 276
172.16.255.255 255.255.255.255 On-link 172.16.3.40 4501
224.0.0.0 240.0.0.0 On-link 127.0.0.1 4531
224.0.0.0 240.0.0.0 On-link 10.0.104.75 4506
224.0.0.0 240.0.0.0 On-link 172.16.3.40 4502
224.0.0.0 240.0.0.0 On-link 172.16.104.75 21
255.255.255.255 255.255.255.255 On-link 127.0.0.1 4531
255.255.255.255 255.255.255.255 On-link 10.0.104.75 4501
255.255.255.255 255.255.255.255 On-link 172.16.3.40 4501
255.255.255.255 255.255.255.255 On-link 172.16.104.75 276
===========================================================================
Persistent Routes:
Network Address Netmask Gateway Address Metric
0.0.0.0 0.0.0.0 172.16.250.250 Default
===========================================================================

IPv6 Route Table
===========================================================================
Active Routes:
If Metric Network Destination Gateway
1 306 ::1/128 On-link
10 276 fe80::/64 On-link
11 276 fe80::/64 On-link
10 276 fe80::7822:31f3:9174:f4e7/128
On-link
11 276 fe80::ac9d:6a78:bf36:9caf/128
On-link
1 306 ff00::/8 On-link
10 276 ff00::/8 On-link
11 276 ff00::/8 On-link
===========================================================================
Persistent Routes:
None

i use 172.16.250.250 as default gateway for internet

I understand that from your ipconfig and the route table, but what I'm unclear about is the actual symptoms of the problem. Can you clarify this sentence with (lots of) additional detail?

"... i have to connect PPPOE dialup connection, for using my lan, but the internet is disconnected from other card."

As a stab in the dark, the problem is that you're using this machine as a router for other boxes on the LAN segment (10.x.y.z) to gain internet access, and that stopped working since the arrival of PPPoE. Depending on how your network is set up, you may find that reverting to the weak host model helps (Vista uses strong host by default):

netsh interface ipv4 set interface weakhostsend
netsh interface ipv4 set interface weakhostreceive

Otherwise, if you explain the problem in more detail, someone may be able to give you a targeted answer.

see i have a ethernet which i will denote as x

details of x:
ip : 172.16.3.40
subnet : 255.255.0.0
gateway : 172.16.250.250

and another ethernet y

details of y

ip (set to auto)

suppose i have done nothing. i.e. not dialed pppoe yet. i can use internet from x, but i cant enter into y's lan. for that i have to dial pppoe. but after dialling pppoe, i cant use x's internet.

this is the problem