[c-nsp] Problem w/ Async Dial-Backup

[Garry]

I have a funny problem with an async dial backup ... routers are a 1800 
series with dual async HWIC, the other side is a 1700 with a modem on 
the AUX port ... (one side is in Mexico, no ISDN available, so I need to 
use Modem ...)

The PPP connection is set up correctly, one router can reach all boxes 
on the other side, the other router can't reach anything but the first 
router, and neither side's boxes can reach anything on the remote side ...

Any idea what could cause this?

I have "async default routing" in the config of both sides' async 
interfaces, "show ip route" shows the remote /24 to be connected via the 
dialer interface during Backup ...

Other than that, I believe I have all essential settings as listed in 
the cisco sample docs, e.g. 
http://cisco.com/en/US/tech/tk801/tk36/technologies_configuration_example09186a0080093d2b.shtml

Any hints/ideas welcome!


Here's one side's config in excerpts:

interface FastEthernet0
  ip address 192.168.4.254 255.255.255.0
  ip nat inside
  ip inspect LAN in
  no ip mroute-cache
  no cdp enable
!
interface Async1
  description Dial-Backup
  no ip address
  encapsulation ppp
  no ip mroute-cache
  dialer in-band
  dialer pool-member 103
  async default routing		<- tried without first
  async mode interactive
  ppp authentication pap chap
!
interface Dialer103
  ip address 172.17.254.14 255.255.255.252
  encapsulation ppp
  dialer pool 103
  dialer remote-name Eic
  dialer idle-timeout 180
  dialer string 00xxxxxxxxxxxxxxx
  dialer-group 1
  no cdp enable
  ppp authentication chap pap callout
!
router eigrp 10
  network 172.31.0.0
  network 192.168.4.0
  no auto-summary
  no eigrp log-neighbor-changes
!
ip nat inside source route-map NATLIST interface Ethernet0 overload
ip classless
ip route 0.0.0.0 0.0.0.0 213.20.x.x
ip route 192.168.1.0 255.255.255.0 Dialer103 200

!
line 1 2
  script dialer Dialout
  modem InOut
  modem autoconfigure discovery
  transport preferred none
  transport input all
  transport output all
  stopbits 1
  speed 115200
  flowcontrol hardware

------------------------------------------
Other side:

interface FastEthernet0
  ip address 192.168.1.254 255.255.255.0
  ip nat inside
  ip inspect LAN in
!
interface Async5
  description Dial-Backup Mexico
  no ip address
  encapsulation ppp
  no ip mroute-cache
  dialer in-band
  dialer pool-member 103
  async default routing
  async mode interactive
  ppp authentication pap chap
!
interface Dialer103
  ip address 172.17.254.13 255.255.255.252
  encapsulation ppp
  dialer pool 103
  dialer remote-name puebla
  dialer idle-timeout 180
  dialer-group 1
  no cdp enable
  ppp authentication chap pap callin
!
router eigrp 10
  redistribute static
  network 172.31.0.0
  network 192.168.1.0
  distribute-list ROUTELIST out
  no auto-summary
!

ip nat inside source route-map NATLIST interface Ethernet0 overload
ip classless
ip route 192.168.4.0 255.255.255.0 Dialer103 200
!
dialer-list 1 protocol ip list 100
!
!
line aux 0
  script dialer Dialout
  login authentication userauthen
  modem InOut
  modem autoconfigure discovery
  transport preferred none
  transport input all
  autoselect ppp
  stopbits 1
  speed 115200
  flowcontrol hardware