[nsp] DDR authentication and routing based on DIN

From: Stephen Balbach (stephen@vma.verio.net)
Date: Fri Oct 01 1999 - 14:54:13 EDT


DialOnDemand routing authentication and routing problem. ISDN customers
are dialing into a PRI with no authentication. No name or password or PAP
or radius or local username.

relevant cisco cfg:

controller T1 1/0
 framing esf
 clock source line
 linecode b8zs
 pri-group timeslots 1-24
!
interface Loopback10
 description DC Midtown POP, former ascend max1800
 ip address 207.97.60.62 255.255.255.255
!
interface Serial 0/0:23 (23 is D-Channel, cfg applies to all B-chan)
 no ip address
 encapsulation ppp
 isdn incoming-voice data
 dialer rotary-group 0
 dialer-group 1
 no fair-queue
 no cdp enable
!
interface Dialer0
 ip unnumbered Loopback10
 encapsulation ppp
 no ip mroute-cache
 dialer in-band
 dialer idle-timeout 2147483
 dialer-group 1
 autodetect encapsulation ppp v120
 no fair-queue
 compress stac
 no cdp enable
 ppp multilink

Customer is using 168.143.224.96 255.255.255.240

This wont work:

        ip route 168.143.224.96 255.255.255.240 Dialer0

because it routes to s0/0:0 which is the first B channel. Irregardless of
what B channel the customer is on.

The only piece of information available is the caller ID of the calling
number.

sh dialer:

Serial0/0:0 - dialer type = ISDN
Idle timer (2147483 secs), Fast idle timer (20 secs)
Wait for carrier (30 secs), Re-enable (15 secs)
Calling number 4108840955

Here we can see that 4108840955 is dialed into the first B channel, and we
know that 168.143.224.96/28 should be routed to 4108840955

Question is: Is it possible to dynamically route a network based on the
DIN?



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