slackware linux 3.5(RH 5.0 ,5.1) ppp problem

  Hello all. I have a realy "BIG" problem it's almost an year i am trying to config my ppp in the LINUXes listed above and I can't the problem is the same : chat finishes to dial ,cheking user name and password and get's connected but when the pppd starts it just disconnects in 5-10 seconds

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  Hello all. I have a realy "BIG" problem it's almost an year i am trying to config my ppp in the LINUXes listed above and I can't the problem is the same : chat finishes to dial ,cheking user name and password and get's connected but when the pppd starts it just disconnects in 5-10 seconds(