Vedr.: Re: [cisco-nas] Problems with multilink PPP/ISDN

[Darren Ward]

It looks like one end is sending an ack with a different MRRU to a request.

This is legal only if the packet is a CONFNACK which means negotiate, a
CONFACK means or should mean 'I accept these parameters', so the other end
is rightly saying it's a bad ACK.

You'll see it where it send out a CONFREQ for 1524 and the matching CONFACK
has changed it to 1500.

Later the MRRU's match and the link comes up.

Darren Ward
CCIE # 8245 

-----Original Message-----

-- SNIP -- Mismatched MRRU's

2d22h: Se3/0:0 LCP: O CONFREQ [Listen] id 30 len 36
2d22h: Se3/0:0 LCP:    AuthProto CHAP (0x0305C22305)
2d22h: Se3/0:0 LCP:    MagicNumber 0x1F9D41A3 (0x05061F9D41A3)
2d22h: Se3/0:0 LCP:    MRRU 1524 (0x110405F4)
2d22h: Se3/0:0 LCP:    EndpointDisc 1 ao-srv01-dia01
2d22h: Se3/0:0 LCP:     (0x131101616F2D73727630312D64696130)
2d22h: Se3/0:0 LCP:     (0x31)
... snip...
2d22h: Se3/0:0 LCP: I CONFACK [ACKsent] id 30 len 25
2d22h: Se3/0:0 LCP:    AuthProto CHAP (0x0305C22305)
2d22h: Se3/0:0 LCP:    MagicNumber 0x1F9D41A3 (0x05061F9D41A3)
2d22h: Se3/0:0 LCP:    MRRU 1500 (0x110405DC)
2d22h: Se3/0:0 LCP:    EndpointDisc 1 Local (0x130601CADFD7)
2d22h: Se3/0:0 LCP: Ignoring bad ACK!

-- SNIP -- Later we request 1524 and get back 1524 and link progresses to up
and AAA

2d22h: Se3/0:0 LCP: O CONFREQ [ACKsent] id 31 len 36
2d22h: Se3/0:0 LCP:    AuthProto CHAP (0x0305C22305)
2d22h: Se3/0:0 LCP:    MagicNumber 0x1F9D41A3 (0x05061F9D41A3)
2d22h: Se3/0:0 LCP:    MRRU 1524 (0x110405F4)
2d22h: Se3/0:0 LCP:    EndpointDisc 1 ao-srv01-dia01
2d22h: Se3/0:0 LCP:     (0x131101616F2D73727630312D64696130)
2d22h: Se3/0:0 LCP:     (0x31)
2d22h: Se3/0:0 LCP: I CONFACK [ACKsent] id 31 len 36
2d22h: Se3/0:0 LCP:    AuthProto CHAP (0x0305C22305)
2d22h: Se3/0:0 LCP:    MagicNumber 0x1F9D41A3 (0x05061F9D41A3)
2d22h: Se3/0:0 LCP:    MRRU 1524 (0x110405F4)
2d22h: Se3/0:0 LCP:    EndpointDisc 1 ao-srv01-dia01
2d22h: Se3/0:0 LCP:     (0x131101616F2D73727630312D64696130)
2d22h: Se3/0:0 LCP:     (0x31)
2d22h: Se3/0:0 LCP: State is Open

-- SNIP --