From: Kelly Cobean (kcobean@earthlink.net)
Date: Thu Feb 13 2003 - 00:23:11 GMT-3
Hey all,
I'm working on one of the IPExpert labs (which I'm really liking, by the
way), and since I don't have two routers with ISDN int's or an ISDN SIM, I'm
using the two phone lines in my house and a pair of modems on the aux ports
to create the Demand circuit required. The Lab calls for a callback
solution where one router (routerA, we'll call it) has a better calling plan
than the other router (routerB), but routerB is supposed to notify routerA
of topology changes via the POTS connection, implying that routerB is
supposed to dial routerA, request callback, then hangup and wait for routerA
to do it's thing. The solution for ISDN is pretty straight forward, and
I've scoured Cisco.com for comparable async examples but I simply cannot get
this to work. I'd continue to beat my head against it without yelling uncle
if I had time, but since this is really outside the scope of the lab, I'm
yelling...Can anyone take a gander at my configs and tell me what I'm
missing that might be particular to async vs. ISDN? The symptom is that
without the callback config on routerA, the link comes up just fine.
However, as soon as I add the callback configuration on RouterA, the routers
fail to completely negotiate the initial PPP session (where routerB dials
routerA to request callback). Below are the pertinent sections of the
configuration. Any help GREATLY appreciated. Thanks.
RouterA#
username RouterB callback-dialstring 703433xxxx callback-line 1 password 0
cisco
!
interface Async1
ip address 192.168.25.2 255.255.255.0
encapsulation ppp
no ip route-cache
ip ospf authentication
ip ospf authentication-key cisco
ip ospf demand-circuit
no ip mroute-cache
dialer in-band
dialer map ip 192.168.25.5 name RouterB class cheaper 703433xxxx
async mode interactive
ppp callback accept
ppp authentication chap
hold-queue 75 out
!
map-class dialer cheaper
dialer callback-server username
!
line aux 0
modem InOut
modem autoconfigure discovery
transport input all
autoselect ppp
callback forced-wait 10
________________________________________
RouterB#
username RouterA password 0 cisco
interface Async1
ip address 192.168.25.5 255.255.255.0
encapsulation ppp
ip ospf authentication
ip ospf authentication-key cisco
ip ospf demand-circuit
dialer in-band
dialer enable-timeout 6
dialer map ip 192.168.25.2 name RouterA 703444xxxx
dialer hold-queue 75
dialer-group 1
ppp callback request
ppp authentication chap
!
dialer-list 1 protocol ip permit
!
line aux 0
modem InOut
modem autoconfigure discovery
transport input all
speed 38400
Thanks again to anyone who can shed some light on this...
Kelly Cobean
.
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