12-09-2012 10:44 PM - edited 03-04-2019 06:22 PM
Hi,
I have one Dynamic DSL line, this line plug to the Dlink router can work properly. But for some reason, we need to change to the cisco 877 router, when I conenct this line to the cisco router, it cannot work, the configuration seems incorrect. Below is the configuration:
version 12.3
no service pad
service tcp-keepalives-in
service tcp-keepalives-out
service timestamps debug datetime msec localtime show-timezone
service timestamps log datetime msec localtime show-timezone
service password-encryption
service sequence-numbers
!
hostname router-877
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
!
username admin password 7 5sg234kjasjdb
!
ip subnet-zero
no ip source-route
ip cef
!
!
!
!
no ip bootp server
!
!
interface ATM0
no ip address
no ip redirects
no ip unreachables
no ip proxy-arp
ip route-cache flow
no atm ilmi-keepalive
dsl operating-mode auto
!
interface ATM0.1 point-to-point
pvc 0/100
pppoe-client dial-pool-number 1
!
!
interface Vlan1
description LAN
ip address 172.16.0.200 255.255.255.0
no ip redirects
no ip unreachables
no ip proxy-arp
ip nat inside
ip virtual-reassembly
ip tcp adjust-mss 1412
!
interface Dialer1
description Internet DSL access
ip address negotiated
no ip redirects
no ip unreachables
no ip proxy-arp
ip mtu 1452
ip nat outside
ip virtual-reassembly
encapsulation ppp
dialer pool 1
dialer-group 1
no cdp enable
ppp authentication chap pap callin
ppp chap hostname company@abc.net
ppp chap password 7 6tmsadvdvk3352gd
ppp pap sent-username company@abc.net password 7 6tmsadvdvk3352gd
!
ip classless
ip route 0.0.0.0 0.0.0.0 Dialer1
!
!
ip nat inside source list 10 interface Dialer1 overload
!
access-list 10 permit 172.16.0.0 0.0.0.255
!
line con 0
line aux 0
line vty 0 4
!
!
end
Please advice where I configure wrong. Thanks
12-09-2012 11:14 PM
Hi,
What is the output of sh ip int br and sh ip route ?
Regards.
Alain
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12-09-2012 11:18 PM
Hi,
Router-877# sh ip int brief
Interface IP-Address OK? Method Status Protocol
FastEthernet0 unassigned YES unset up up
FastEthernet1 unassigned YES unset up down
FastEthernet2 unassigned YES unset up down
FastEthernet3 unassigned YES unset up down
ATM0 unassigned YES manual down down
ATM0.1 unassigned YES unset down down
Vlan1 172.16.0.200 YES manual up up
NVI0 172.16.0.200 YES unset up up
Dialer1 unassigned YES manual up up
Router-877#sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is 0.0.0.0 to network 0.0.0.0
172.16.0.0/24 is subnetted, 1 subnets
C 172.16.0.0 is directly connected, Vlan1
S* 0.0.0.0/0 is directly connected, Dialer1
12-09-2012 11:42 PM
Hi,
shut atm interface then enable debug like this:
enable
debug ppp negotiation
debug ppp authentication
conf t
no service timestamp debug
logging on
logging buffered debug
logging console info
do clear log
int atm
no shut
do sh log
Post the output here.
Regards.
Alain
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12-09-2012 11:51 PM
Hi,
After I enable the debug as you suggest, below is the output for "do sh log" command:
Router-877(config)#do sh log
Syslog logging: enabled (1 messages dropped, 0 messages rate-limited,
0 flushes, 0 overruns, xml disabled, filtering disabled)
No Active Message Discriminator.
No Inactive Message Discriminator.
Console logging: level informational, 26 messages logged, xml disabled,
filtering disabled
Monitor logging: level debugging, 0 messages logged, xml disabled,
filtering disabled
Buffer logging: level debugging, 2 messages logged, xml disabled,
filtering disabled
Logging Exception size (4096 bytes)
Count and timestamp logging messages: disabled
Persistent logging: disabled
No active filter modules.
ESM: 0 messages dropped
Trap logging: level informational, 30 message lines logged
Log Buffer (4096 bytes):
000026: *Dec 10 06:12:49.883 UTC: %LINK-3-UPDOWN: Interface ATM0, changed state to down
000027: *Dec 10 06:12:53.923 UTC: %SYS-5-CONFIG_I: Configured from console by console
Router-877(config)#
12-10-2012 12:03 AM
Hi,
I don't see any shut/no shut on the ATM , did you do this?
This should then start PPP negotiation and you should see it in the log output.
Regards.
Alain
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12-10-2012 12:09 AM
Hi,
I have shut/no shut the ATM interface, but no thing display.
12-10-2012 12:19 AM
Hi,
Can you shut/no shut the dialer interface and tell me if you see logs ?
Regards.
Alain
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12-10-2012 12:25 AM
Hi,
I also shut/no shut the dial 1 interface, but still no thing display except I execute command: do sh log, the content same above log I post.
No Inactive Message Discriminator.
Console logging: level informational, 44 messages logged, xml disabled,
filtering disabled
Monitor logging: level debugging, 0 messages logged, xml disabled,
filtering disabled
Buffer logging: level debugging, 1 messages logged, xml disabled,
filtering disabled
Logging Exception size (4096 bytes)
Count and timestamp logging messages: disabled
Persistent logging: disabled
No active filter modules.
ESM: 0 messages dropped
Trap logging: level informational, 48 message lines logged
Log Buffer (4096 bytes):
000047: *Dec 10 06:47:44.083 UTC: %LINK-3-UPDOWN: Interface Dialer1, changed sta
te to up
12-10-2012 12:57 AM
Hi,
do you hit enter to get all log output ?
Regards.
Alain
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12-10-2012 01:02 AM
Hi,
Yes. After I execute the command: do sh log, I press "space" key to load all output and copy it to this post. above is the all output log.
12-10-2012 01:45 AM
Hi,
http://www.cisco.com/en/US/tech/tk175/tk15/technologies_configuration_example09186a008071a69d.shtml
What are the results ?
Regards.
Alain
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12-10-2012 02:26 AM
Hello Gia,
it looks like you have an OSI physical layer issue
ATM0 unassigned YES manual down down
ATM0.1 unassigned YES unset down down
Follow the document provided by Alain at the point
>>If the ATM interface is down and down—not administratively down—check the pinout of your DSL wall jack. The DSL Router uses a standard RJ-11 (4-pin or 6-pin) cable in order to provide the ADSL connection to the wall jack. The center pair of pins on the RJ-11 cable are used to carry the ADSL signal (pins 3 and 4 on a 6-pin cable, or pins 2 and 3 on a 4- pin cable). This does not apply to the Cisco 1417 which uses pins 2 and 5.
If you are sure you have the right pins on the wall jack and the ATM0 interface is still down and down, replace the RJ-11 cable between the DSL port and your wall jack. If the interface is still down and down after you replace the RJ-11 cable, contact your ISP and have the ISP verify that ADSL service has been enabled on the wall jack that you use.
Hope to help
Giuseppe
12-10-2012 02:29 AM
Hi,
This DSL line is work properly when I connect to the Dlink router, but it is not worked with Cisco 877. And based on this information:
If the CD light is on, go to the Layer 2 Issues section of this document.
If the CD light is off, continue with the next question.
I have checked on the cisco 877 router, the CD light is on.
When I come to the layer 2 issues, although I enable all debug as Alain recommend, but no thing display.
Thanks.
12-10-2012 02:38 AM
Hello Gia,
if ATM interface state is down/down PPPoA negotiation does not start and nothing is displayed on the log.
I agree that the CD LED should be off if ATM interface is down/down.
However, the interface is down so my guess is a physical layer issue.
Hope to help
Giuseppe
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