I have a 1711 router that is configured for dial backup in the event that my ethernet interfaces loses connectivity. I have noticed that after reloads the router will initiate a dialup connection immediately. But after the ethernet interface comes up and starts processing traffic nothing is sent over the async interface and the connection drops after being idle. I am guessing that the router sends some sort of traffic before the ethernet interface comes up and that is why the dialup gets initiated. Does anyone know what kind of traffic does a router initiate upon reboot? I've been trying to look up the router bootup process but it only goes as far as loading the config. The config for my router is below:
description POTS Connection for RAS Dial Back-Up
ip address 10.101.32.<site_net> 255.255.255.0
ip access-group ACL-ASYNC-OUTBOUND out
dialer idle-timeout 900
dialer redial interval 60 attempts 5
dialer string 18664474309
dialer string 918664474309
async mode interactive
ppp authentication chap callin
ppp chap password [new password]
ppp pap refuse
ip route 0.0.0.0 0.0.0.0 Async1 100
ip route 10.101.32.254 255.255.255.255 Async1
dialer-list 1 protocol ip permit
ip access-list extended ACL-ASYNC-OUTBOUND
permit ip 10.178.<site_net>.0 0.0.0.255 10.100.0.0 0.0.255.255
permit ip 10.178.<site_net>.0 0.0.0.255 10.101.11.0 0.0.0.255
permit ip 10.178.<site_net>.0 0.0.0.255 10.101.4.0 0.0.0.255
permit ip 10.178.<site_net>.0 0.0.0.255 10.105.3.0 0.0.0.255
permit ip 10.178.<site_net>.0 0.0.0.255 host 10.101.32.254
permit ip 10.101.32.0 0.0.0.255 host 10.101.32.254
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