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