BSNL Broadband not running when both LAN port Enabled

hi guys,

recently i have facing a strange problem with my network connection. I have Abit IP35 Pro mobo which have two gigabit lan port of which one is previously connected through local cable broadband connection through lan and the other one is now connected through Dataone ADSL Modem...

now when i try to connect Dataone it always said Error 691 when both Port are enabled ...but if i disconnect the other lan port it is connected fine on bsnl broadband... then i could re-enabled the other port but whenever i need to re-connect the bsnl broadband i have to disable the other lan connection... its so annoying

is it any kinda driver issue or motherboard fault or i need to configure something else... i am a complete noob in this matter... plz help me

also plz know me whether i can run both the connection simultaneously or not

i am using genuine XP SP3

thanks in advance.
 
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