interesting traffic not bring up backup link using DDR and dialer profile.

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Jul 25th, 2002
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Here's the situation, We have a remote site with a frame relay connection (via ser0) which we want to back up with an isdn backup line using ddr and a dialer profile to the main site.

Here is the config of the router

:version 12.0

service timestamps debug datetime

service timestamps log datetime

no service password-encryption

service udp-small-servers

service tcp-small-servers

!

hostname remoterouter

!

aaa new-model

aaa authentication login default group tacacs+ local

aaa authentication ppp default local

aaa authorization exec default group tacacs+

aaa accounting exec default start-stop group tacacs+

aaa accounting network default start-stop group tacacs+

enable secret 5 xxxxxxxxxxxx

enable password xxxxxxxxxxxxx

!

username master password 7 xxxxxxxxxxxxxxx

username trr004x password 7 xxxxxxxxxxxxx

!

!

clock timezone gmt 0

clock summer-time bst recurring last Sun Mar 2:00 last Sun Oct 2:00

ip subnet-zero

!

isdn switch-type basic-net3

isdn voice-call-failure 0

isdn tei-negotiation first-call

!

!

interface Loopback0

no ip address

no ip directed-broadcast

!

interface Ethernet0

ip address 10.28.0.1 255.255.252.0

ip helper-address 10.2.44.200

ip helper-address 10.2.16.10

no ip directed-broadcast

keepalive 4

!

interface Serial0

description Frame-Relay Link

bandwidth 64

ip address 10.1.16.2 255.255.252.0

no ip directed-broadcast

encapsulation frame-relay

no ip route-cache

no ip mroute-cache

no fair-queue

frame-relay map ip 10.1.16.1 100 broadcast

frame-relay lmi-type ansi

!

interface Serial1

no ip address

no ip directed-broadcast

shutdown

!

interface BRI0

description dial backup link

bandwidth 56

no ip address

no ip directed-broadcast

encapsulation ppp

no ip route-cache

no ip mroute-cache

no keepalive

dialer pool-member 1

isdn switch-type basic-net3

no fair-queue

no cdp enable

!

interface Dialer0

ip address 10.2.176.10 255.255.255.0

no ip directed-broadcast

encapsulation ppp

dialer remote-name trr004x

dialer pool 1

dialer idle-timeout 90

dialer string 01793848012

dialer-group 1

no fair-queue

no cdp enable

ppp authentication chap

ppp multilink

!

interface Dialer1

no ip address

no ip directed-broadcast

no cdp enable

!

router eigrp 1

network 10.0.0.0

network 144.98.0.0

no auto-summary

!

no ip classless

no ip forward-protocol udp tftp

no ip forward-protocol udp nameserver

no ip forward-protocol udp domain

no ip forward-protocol udp time

no ip forward-protocol udp netbios-ns

no ip forward-protocol udp netbios-dgm

no ip forward-protocol udp tacacs

ip route 0.0.0.0 0.0.0.0 Dialer0 200

no ip http server

!

logging trap debugging

access-list 101 deny eigrp any any

access-list 101 permit ip any any

dialer-list 1 protocol ip list 101

!

tacacs-server host 10.2.44.208

tacacs-server host 10.2.44.206

tacacs-server timeout 1000

tacacs-server key cisco

snmp-server engineID local 00000009020000E01E3E7080

snmp-server community public xxxxxxx

!

line con 0

transport input none

line aux 0

password xxxxxxxx

no activation-character

modem InOut

stopbits 1

flowcontrol hardware

line vty 0 4

password xxxxxxx

!

ntp clock-period 17179522

ntp server 144.98.31.172

end

MRR001X#sh ver

Cisco Internetwork Operating System Software

IOS (tm) 2500 Software (C2500-P-L), Version 12.0(7)T, RELEASE SOFTWARE (fc2)

Copyright (c) 1986-1999 by cisco Systems, Inc.

Compiled Mon 06-Dec-99 19:39 by phanguye

Image text-base: 0x0303C3D4, data-base: 0x00001000

ROM: System Bootstrap, Version 11.0(10c), SOFTWARE

BOOTFLASH: 3000 Bootstrap Software (IGS-BOOT-R), Version 11.0(10c), RELEASE SOF)

MRR001X uptime is 22 hours, 16 minutes

System returned to ROM by power-on

System restarted at 15:17:01 bst Wed Jul 24 2002

System image file is "flash:c2500-p-l.120-7.T.bin"

cisco 2500 (68030) processor (revision N) with 6144K/2048K bytes of memory.

Processor board ID 06099777, with hardware revision 00000001

X.25 software, Version 3.0.0.

Basic Rate ISDN software, Version 1.1.

1 Ethernet/IEEE 802.3 interface(s)

2 Serial network interface(s)

1 ISDN Basic Rate interface(s)

32K bytes of non-volatile configuration memory.

8192K bytes of processor board System flash (Read ONLY)

Configuration register is 0x2102

One problem is that the dialer interface is not dialing out when I ping an ip address on the main site from the remote site after having shut down the frame relay serial interface (administritively). I have tried pinging directly from the remote router and the dialer interface is not dialing out. The bri interface is working as it brings itself up to connect to the ntp server every couple of minutes (which is another problem).

The floating static default route is shown in the route table after having shut down the serial interface along with the subnets of the ethernet and dialer interfaces (and all the eigrp routes disappear).

If i do a debug dialer packets i see the following:

Jul 25 10:30:56: Dialer0 DDR: ip (s=10.2.176.10, d=224.0.0.10), 60 bytes, outgoing uninteresting (list 101)

Jul 25 10:31:00: Dialer0 DDR: ip (s=10.2.176.10, d=224.0.0.10), 60 bytes, outgoing uninteresting (list 101)

but no sign of the ping attempts that are running on the network. I would have expected to see the pings in the debug as interesting traffic but there is no sign of them.

Please let me know if you need any further information.

Rgds,

Martin

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vcjones Thu, 07/25/2002 - 13:24
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Look up the meaning of "no ip classless" and consider if that is really what you want... (remember that 10.*.*.* are all in the same major network). That should take care of your pings.


As for NTP bringing up the line, look at your definition of "interesting traffic" in access-list 101. Last time I checked, NTP used IP. You need to add a deny line for UDP packets using the NTP port.


Good luck and good hunting!


Vincent C Jones

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