CHAP is offered by the ISP and then is rejected by the ISP - PPP

This is a discussion on CHAP is offered by the ISP and then is rejected by the ISP - PPP ; I am working on an ISDN circuit. Layer 1 and 2 are working. When the PPP is negotiating, it shows that my router is requesting CHAP protocol, and the ISP also sends a request for CHAP and my router does ...

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Thread: CHAP is offered by the ISP and then is rejected by the ISP

  1. CHAP is offered by the ISP and then is rejected by the ISP

    I am working on an ISDN circuit. Layer 1 and 2 are working. When the
    PPP is negotiating, it shows that my router is requesting CHAP
    protocol, and the ISP also sends a request for CHAP and my router does
    send a CONFACK to that request.

    But after that the ISP keeps refusing the CHAP request from my router.
    The output is pasted below.

    Any advice is appreciated.

    Thanks,

    DT

    Mar 1 20:11:29.182: BR0/0:1 LCP: O CONFREQ [REQsent] id 231 len 15
    *Mar 1 20:11:29.182: BR0/0:1 LCP: AuthProto CHAP (0x0305C22305)
    *Mar 1 20:11:29.182: BR0/0:1 LCP: MagicNumber 0x0D391935
    (0x05060D391935)
    *Mar 1 20:11:29.222: BR0/0:1 LCP: I CONFREQ [REQsent] id 1 len 34
    *Mar 1 20:11:29.222: BR0/0:1 LCP: VendorSpecific OUI (0x00040000)
    *Mar 1 20:11:29.222: BR0/0:1 LCP: MRU 1524 (0x010405F4)
    *Mar 1 20:11:29.222: BR0/0:1 LCP: AuthProto CHAP (0x0305C22305)
    *Mar 1 20:11:29.222: BR0/0:1 LCP: MRRU 1524 (0x110405F4)
    *Mar 1 20:11:29.226: BR0/0:1 LCP: EndpointDisc 3 00d0.5202.397e
    (0x13090300D05202397E)
    *Mar 1 20:11:29.226: BR0/0:1 LCP: LinkDiscriminator 50180
    (0x1704C404)
    *Mar 1 20:11:29.226: BR0/0:1 LCP: O CONFREJ [REQsent] id 1 len 16
    *Mar 1 20:11:29.226: BR0/0:1 LCP: VendorSpecific OUI (0x00040000)
    *Mar 1 20:11:29.226: BR0/0:1 LCP: MRRU 1524 (0x110405F4)
    *Mar 1 20:11:29.226: BR0/0:1 LCP: LinkDiscriminator 50180
    (0x1704C404)
    *Mar 1 20:11:29.230: BR0/0:1 LCP: I CONFREJ [REQsent] id 231 len 9
    *Mar 1 20:11:29.230: BR0/0:1 LCP: AuthProto CHAP (0x0305C22305)
    *Mar 1 20:11:29.230: BR0/0:1 LCP: O CONFREQ [REQsent] id 232 len 15
    *Mar 1 20:11:29.230: BR0/0:1 LCP: AuthProto CHAP (0x0305C22305)
    *Mar 1 20:11:29.230: BR0/0:1 LCP: MagicNumber 0x0D391935
    (0x05060D391935)
    *Mar 1 20:11:29.262: BR0/0:1 LCP: I CONFREQ [REQsent] id 2 len 22
    *Mar 1 20:11:29.262: BR0/0:1 LCP: MRU 1524 (0x010405F4)
    *Mar 1 20:11:29.262: BR0/0:1 LCP: AuthProto CHAP (0x0305C22305)
    *Mar 1 20:11:29.262: BR0/0:1 LCP: EndpointDisc 3 00d0.5202.397e
    (0x13090300D05202397E)
    *Mar 1 20:11:29.266: BR0/0:1 LCP: O CONFACK [REQsent] id 2 len 22
    *Mar 1 20:11:29.266: BR0/0:1 LCP: MRU 1524 (0x010405F4)
    *Mar 1 20:11:29.266: BR0/0:1 LCP: AuthProto CHAP (0x0305C22305).
    *Mar 1 20:11:29.266: BR0/0:1 LCP: EndpointDisc 3 00d0.5202.397e
    (0x13090300D05202397E)
    *Mar 1 20:11:29.266: BR0/0:1 LCP: I CONFREJ [ACKsent] id 232 len 9
    *Mar 1 20:11:29.270: BR0/0:1 LCP: AuthProto CHAP (0x0305C22305)
    *Mar 1 20:11:29.270: BR0/0:1 LCP: O CONFREQ [ACKsent] id 233 len 15
    *Mar 1 20:11:29.270: BR0/0:1 LCP: AuthProto CHAP (0x0305C22305)
    *Mar 1 20:11:29.270: BR0/0:1 LCP: MagicNumber 0x0D391935
    (0x05060D391935)
    *Mar 1 20:11:29.330: BR0/0:1 LCP: I CONFREJ [ACKsent] id 233 len 9
    *Mar 1 20:11:29.334: BR0/0:1 LCP: AuthProto CHAP (0x0305C22305)
    *Mar 1 20:11:29.334: BR0/0:1 LCP: O CONFREQ [ACKsent] id 234 len 15
    *Mar 1 20:11:29.334: BR0/0:1 LCP: AuthProto CHAP (0x0305C22305)
    *Mar 1 20:11:29.334: BR0/0:1 LCP: MagicNumber 0x0D391935
    (0x05060D391935)


  2. Re: CHAP is offered by the ISP and then is rejected by the ISP

    dt1649651@yahoo.com wrote:
    > I am working on an ISDN circuit. Layer 1 and 2 are working. When the
    > PPP is negotiating, it shows that my router is requesting CHAP
    > protocol, and the ISP also sends a request for CHAP and my router does
    > send a CONFACK to that request.


    > But after that the ISP keeps refusing the CHAP request from my router.


    Patient: Doctor, doctor, it hurts when I lift my arm.

    Doctor: So don't lift your arm.

    Rare indeed is the ISP that will authenticate itself to a customer.

    -- Clifford Kite Email: "echo xvgr_yvahk-ccc@ri1.arg|rot13"
    PPP-Q&A links, downloads: http://ckite.no-ip.net/
    /* "PPPoE has many advantages for DSL service providers, and
    practically none for DSL consumers."
    - David F. Skoll */

  3. Re: CHAP is offered by the ISP and then is rejected by the ISP


    Clifford Kite wrote:
    > dt1649651@yahoo.com wrote:
    > > I am working on an ISDN circuit. Layer 1 and 2 are working. When

    the
    > > PPP is negotiating, it shows that my router is requesting CHAP
    > > protocol, and the ISP also sends a request for CHAP and my router

    does
    > > send a CONFACK to that request.

    >
    > > But after that the ISP keeps refusing the CHAP request from my

    router.
    >
    > Patient: Doctor, doctor, it hurts when I lift my arm.
    >
    > Doctor: So don't lift your arm.
    >
    > Rare indeed is the ISP that will authenticate itself to a customer.


    Thank you very much. After changing to one-way authentication, my
    router passed that part and went to the AUTHENTICATING phase. It has
    some problem there but perhaps the provided username / password is
    incorrect. I will call the ISP tomorrow.

    DT


  4. Re: CHAP is offered by the ISP and then is rejected by the ISP

    dt1649651@yahoo.com writes:

    >I am working on an ISDN circuit. Layer 1 and 2 are working. When the
    >PPP is negotiating, it shows that my router is requesting CHAP
    >protocol, and the ISP also sends a request for CHAP and my router does
    >send a CONFACK to that request.


    >But after that the ISP keeps refusing the CHAP request from my router.
    >The output is pasted below.


    Yes, they will. So why are you requesting chap? They do not want to give
    it. Youhave two choices -- stop requesting it, or do not use that ISP (
    although all (ie >99%) of ISPs will refuse to authenticate to you.
    Thus, I suggest you stop requesting chap.


    >Any advice is appreciated.


    Stop having your router request chap.



  5. Re: CHAP is offered by the ISP and then is rejected by the ISP

    Unruh wrote:
    > dt1649651@yahoo.com writes:
    >
    > >I am working on an ISDN circuit. Layer 1 and 2 are working. When the
    > >PPP is negotiating, it shows that my router is requesting CHAP
    > >protocol, and the ISP also sends a request for CHAP and my router

    does
    > >send a CONFACK to that request.

    >
    > >But after that the ISP keeps refusing the CHAP request from my

    router.
    > >The output is pasted below.

    >
    > Yes, they will. So why are you requesting chap? They do not want to

    give
    > it. Youhave two choices -- stop requesting it, or do not use that ISP

    (
    > although all (ie >99%) of ISPs will refuse to authenticate to you.
    > Thus, I suggest you stop requesting chap.


    Yes, you are right. I misdunderstood Chap. After re-reading the Chap
    protocol, I understand that the Chap authentication can be uni- or
    bi-directional. It is unidirectional in my case, and it is the ISP 's
    PPP denies my CHAP request.
    >
    >
    > >Any advice is appreciated.

    >
    > Stop having your router request chap.


    Yes, I did it and it works :-)

    Thanks,

    DT


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