I replaced the router with a 1750 router with ISDN as backup (T1 primary) I forgot to put backup delay command under serial int (as shown below) the isdn kept connecting/disconnecting within seconds and we got like $23k for isdn bill I am wondering if it was just due to that one line or why will it keep connecting again.. Please help
You have to figure out which traffic is bringing the dialer interface up. This traffic is known as "interesting traffic." You want to make sure that you create an ACL for your dialer-list that will deny the kind of traffic that the router will broadcast or multicast out all interfaces, like eigrp traffic.
You can take 2 approaches, either permit exactly what you want and let the implicit deny handle the rest. Or you can specifically deny the traffic you know will bring up the interface and permit everything else.
You need to turn on debugging, configure ip accounting, use a sniffer, etc, to examine the ISDN traffic.
By the way, I used to troubleshoot such problems after receiving an incredibly high bill all the time. It can be fun, playing detective. :-)
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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