For doing DDR, the normal configuration we are using is this:
-----------------------------------------------
Standard configuration
interface BRI0
description isdn 073453545
no ip address
encapsulation ppp
no ip mroute-cache
dialer rotary-group 1
isdn switch-type basic-net3
no cdp enable
interface Dialer1
ip address 172.31.5.x 255.255.255.128
encapsulation ppp
dialer in-band
dialer idle-timeout 300
dialer map ip 172.31.5.1 name e-nash number 1
dialer map ip 172.31.5.1 name e-nash number 2
dialer map ip 172.31.5.1 name e-nash number 3
dialer map ip 172.31.5.1 name e-nash number 4
dialer load-threshold 10 either
dialer-group 1
no cdp enable
ppp authentication chap
ppp multilink bap
ip route 0.0.0.0 0.0.0.0 172.31.5.1 200
------------------------------------------------
------------------------------------------------
E-NASH router (C7500 - IOS 12.1.22b)
interface Dialer1
ip address 172.28.34.1 255.255.255.0 secondary
ip address 172.31.5.1 255.255.255.128
encapsulation ppp
load-interval 30
dialer in-band
dialer idle-timeout 300
dialer map ip 172.31.5.b name X-SITE number
dialer load-threshold 10 either
dialer-group 1
no cdp enable
ppp authentication chap
ppp multilink
ip route (X-SITE network) to 172.31.5.b
-------------------------------------------------
The problem starts when I change the dialer network on one site.
E-SITE (C2811 - IOS 12.4.13b)
interface Dialer1
ip address 172.28.34.2 255.255.255.0 <- New address pool (secondary on E-NASH)
encapsulation ppp
dialer in-band
dialer idle-timeout 300
dialer map ip 172.31.5.1 name e-nash number 1
dialer map ip 172.31.5.1 name e-nash number 2
dialer map ip 172.31.5.1 name e-nash number 3
dialer map ip 172.31.5.1 name e-nash number 4
dialer map ip 172.28.34.1 name e-nash number 1
dialer map ip 172.28.34.1 name e-nash number 2
dialer map ip 172.28.34.1 name e-nash number 3
dialer map ip 172.28.34.1 name e-nash number 4
dialer load-threshold 10 either
dialer-group 1
no cdp enable
ppp authentication chap
ppp multilink bap
ip route 0.0.0.0 0.0.0.0 172.31.5.1 200
ip route 0.0.0.0 0.0.0.0 172.28.34.1 200
On nash router:
Dialer1
dialer map ip 172.28.34.2 name E-SITE number
---
ip route (E-SITE network) to 172.28.34.2
E-NASH has the 172.31.5.x as primary, we have 70 sites connected in ISDN on that network
backup and the 172.31.5.x is exausted, so I have to use the new 172.28.34.x.
I got some packet loss when I ping from E-SITE to the ethernet of the E-NASH router and I have seen the E-NASH
appears ever with the primary address (172.31.5.1).
The problem seems to be random, and if I ping from E-SITE to a router behind E-NASH seems to respond ok.
Using the network 172.31.5.x there is no problem of packet lost when I Ping, the problem is present only
with the new network.
At this point is it possible a problem with the IOS on NASH router? or is there another possibility
to use a secondary interface using dial map?...
Best Regards!
