From: Jim (nhatquang@thiennam.org)
Date: Wed Apr 06 2005 - 00:20:08 GMT-3
you can see how r4 knows r5 hostname ROUTER5 for its callback.
here I user protocol ip permit to simulate clns_is traffic.
HTH, Jim.
R4
username ROUTER5 password 0 CISCO
!
interface BRI0/0
ip address 132.1.45.4 255.255.255.0
encapsulation ppp
dialer idle-timeout 0
dialer map ip 132.1.45.5 name ROUTER5 class CALLBACK broadcast 2221
isdn switch-type basic-net3
ppp callback accept
ppp authentication chap
ppp chap hostname ROUTER4
!
map-class dialer CALLBACK
dialer callback-server username
R5
username ROUTER4 password 0 CISCO
!
interface BRI0/0
ip address 132.1.45.5 255.255.255.0
encapsulation ppp
dialer idle-timeout 20
dialer map ip 132.1.45.4 name ROUTER4 broadcast 4441
dialer-group 1
isdn switch-type basic-net3
ppp callback request
ppp chap hostname ROUTER5
!
dialer-list 1 protocol ip permit
!
r5#ping 132.1.45.4
r4#
*Mar 1 20:13:00.951: %LINK-3-UPDOWN: Interface BRI0/0:1, changed state to up
*Mar 1 20:13:00.951: %ISDN-6-CONNECT: Interface BRI0/0:1 is now connected to
2221 N/A
*Mar 1 20:13:00.955: BR0/0:1 PPP: Using dialer call direction
*Mar 1 20:13:00.955: BR0/0:1 PPP: Treating connection as a callin
*Mar 1 20:13:02.947: BR0/0:1 PPP: Authorization required
*Mar 1 20:13:02.979: BR0/0:1 CHAP: O CHALLENGE id 7 len 28 from "ROUTER4"
*Mar 1 20:13:02.995: BR0/0:1 CHAP: I RESPONSE id 7 len 28 from "ROUTER5"
*Mar 1 20:13:02.999: BR0/0:1 PPP: Sent CHAP LOGIN Request
*Mar 1 20:13:02.999: BR0/0:1 PPP: Received LOGIN Response PASS
*Mar 1 20:13:03.003: BR0/0:1 PPP: Sent LCP AUTHOR Request
*Mar 1 20:13:03.003: BR0/0:1 PPP: Sent IPCP AUTHOR Request
*Mar 1 20:13:03.003: BR0/0:1 LCP: Received AAA AUTHOR Response PASS
*Mar 1 20:13:03.003: BR0/0:1 IPCP: Received AAA AUTHOR Response PASS
*Mar 1 20:13:03.007: BR0/0:1 CHAP: O SUCCESS id 7 len 4
*Mar 1 20:13:04.008: %LINEPROTO-5-UPDOWN: Line protocol on Interface
BRI0/0:1, changed state to up
----- Original Message -----
From: Ian Henderson
To: ccielab@groupstudy.com
Sent: Wednesday, April 06, 2005 9:40 AM
Subject: dialer interesting traffic
Hi all,
I'm working through IEWB lab 2, and have some questions on callback and
PPP. They look like simple enough questions, but I can't find answers
googling around.
- The callback link comes up from R4 to R5 and the peers authenticate, but
without a dialer-group configured on R4, all traffic is marked as
uninteresting and discarded. Cisco's answer to this is add a
dialer-group and remove the phone number from the dialer-map. This won't
work with PPP callback though. How do I create a dialer-group that
allows traffic to the other peer, but won't bring up the link?
- If both peers were authenticating CHAP bidirectionally, both routers
would see the peer hostname in 'show isdn active' or 'show users'. But
when R5 isn't authenticating R4, it doesn't see the remote hostname.
This means the router can't find the correct dialer-map. How do you
specify which dialer-map to use when the discriminator ('name ROUTER4')
isn't available?
R4:
interface BRI0/0
ip address 132.1.45.4 255.255.255.248
ip router isis
encapsulation ppp
dialer idle-timeout 0
dialer map clns 49.0044.0001.0001.0005.00 name ROUTER5 class CALLBACK
broadcast 9325xxxx
dialer map ip 132.1.45.5 name ROUTER5 class CALLBACK broadcast 9325xxxx
isdn switch-type basic-net3
isdn answer1 9325yyyy
isdn answer2 9325yyyy
ppp callback accept
ppp authentication chap
ppp chap hostname ROUTER4
isis circuit-type level-2-only
R5:
interface BRI0/0
ip address 132.1.45.5 255.255.255.248
ip router isis
encapsulation ppp
dialer map clns 49.0044.0001.0001.0004.00 name ROUTER4 broadcast 9325yyyy
dialer map ip 132.1.45.4 name ROUTER4 broadcast 9325yyyy
dialer-group 1
isdn switch-type basic-net3
isdn answer1 9325xxxx
isdn answer2 9325xxxx
ppp callback request
ppp chap hostname ROUTER5
isis circuit-type level-2-only
Thanks,
- I.
--
Ian Henderson CCNA, CCNP
Senior Network Engineer
iiNet Limited
Chime Communications Pty Ltd
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