ISDN Connection not terminating

[jsingh9741]

I have a Cisco 1720 Router with a ISDN BRI0 interface, a 10baset-T interface and a Fast-Ethernet port. The Fast Ethernet port is connected to The Local Area Network. The ISDN Connection establishes a link to the Corporate office in Australia. The 10-Base-T connects to a DSL modem that is the internet access. The problem we are having is that the ISDN connection is kicking on automatically even when we are not trying to use the connection and it will not terminate something is turning it on and keeping it up. I don't know if it is something in the access list or the bri0 configuration. Also is there a way to look at all traffic that is going across the router debug commands?
here is part of the configuration.

interface FastEthernet0
ip address 10.9.0.254 255.255.255.0
ip accounting output-packets
ip nat inside
speed autoe
full-duplex
no cdp enable
!
ip nat inside source list 2 interface Ethernet0 Overload
ip classless
ip route 0.0.0.0 0.0.0.0 62.12.192.134
ip route 10.30.0.1 255.255.255.0 BRI0
ip route 10.30.0.5 255.255.255.0 BRI0
ip route 143.155.12.2 255.255.255.255 BRI0
ip route 192.0.0.0 255.0.0.0 143.155.12.2
no ip http server
!
access-list 1 permit any
access-list 2 deny 10.9.0.254
access-list 2 permit any
access-list 2 permit 10.50.0.0 0.0.0.255
access-list 101 deny ip host 62.12.192.135host 192.168.200.5
access-list 101 deny ip any 224.0.0.0 0.255.255.255
access-list 101 deny ip any host 255.255.255.255
access-list 1 protocol ip list 101

Any advise would be helpful.

Thanks

Jas Singh

 

[jeter]

show dialer will show you a dial string and last called.


Add these debug commands to help troble shoot your problem.

Service timestamps
debug isdn q921 layer 2
debug isdn q931 layer 3

You may also want to put a sniffer on your network to get
a inside look of your application.

Remember to ( no debug all ) when completed Jeter@LasVegas.com
J.Fisher CCNA

 

[ChrisAC]

It looks like your ethernet interface is letting any traffic through, so if the dialer interface is set up for DDR then any traffic on the local network will bring the line up.

We had this problem recently with a customer who had a massive phone bill that showed connections through the night when no one was in the office. They swore blind that the router was faulty and that there was no one to initiate the connections as all the PC's were switched off. It turned out to be the server checking a POP3 mail box and the anti-virus program doing its updates via FTP.

Chris.
************************
Chris Andrew, CCNA
chrisac@gmx.co.uk
************************

 

[Saeed42]

You might want to block netbios broadcast as well

access-list 101 deny udp any any eq netbios-ns
access-list 101 deny udp any any eq netbios-dgm
access-list 101 deny udp any any eq netbios-ss
access-list 101 deny tcp any any eq 139
access-list 101 deny tcp any any eq 445
access-list 101 deny udp any any eq 445