Re: Cisco 837 router does not connect to ADSL.

marianodaniel · ‎01-19-2022

Hello! Here again, being one of those annoying people coming with legacy devices that don’t work.

This time, I managed to access my Cisco 837 using a Windows 98 VM. Only problem is, when trying to enter my ADSL username and password (and VPI/VCI) but I get the following error:

Workarounds/Tests/Info:

The DSL cable is connected and works ok with my other router.
The only information I do not know for sure, is the VPI/VCI, I got it from a forum for my ISP.
I have reset the router to factory defaults.

Is there a way to read more detailed logs? Might be the ADSL port broken? I’m at loss 🤷🏻‍

Any help or tips are much appreciated!

balaji.bandi · ‎01-19-2022

who is the service provider, what is the setting they need to configure to DSL to connect ?

best is connect console cable you see more debug logs than GUI

with this information we are not sure is this broken or can be used also.

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marianodaniel · ‎01-19-2022

Hello @balaji.bandi ! Provider is A1 Austria. Settings they gave me, were only username and password for the ADSL.

Can I SSH/Telnet into the router? Will that provide proper log levels? What am I specifically looking for in the logs and where?

Thanks a lot!

Georg Pauwen · ‎01-19-2022

Hello,

the 837 router has an end of life date of 2006. Chances are that your modem/chipset and the ISP DSLAM are not compatible, and that is causing the problem. You are using Windows 98 ? That is obviously also more than 20 year old software...

marianodaniel · ‎01-19-2022

Hello @Georg Pauwen ! Thanks for helping me again!

I know the router is super old, but Austria’s infrastructure is also old, my internet is only 3 or 6Mbps connection!

I am using Windows 98 on a virtual machine, so I could use CRWS. I saw a lot threads where this router would work. I was hoping mine would too

Georg Pauwen · ‎01-19-2022

Hello,

with the DSL cable connected, what is the status/color of the LED of the WAN interface ?

Also, can you get to the command line (cli) ? It is easier to see what is going on because from the cli, you can activate debug commands..

marianodaniel · ‎01-19-2022

Router doesn’t have a WAN LED, only ADSL, which are by the way constantly blinking, with or without the DSL cable connected (see image below, the 837 is the one below).

I connected to the cli and am on the executive mode and debug command. Should I enable debug for pppoe or for all?

Georg Pauwen · ‎01-20-2022

Hello,

a green, albeit blinking, xDSL LED is a good sign. Who is your ISP/provider in Austria ?

And since you have access to the CLI, can you post the output of:

sh run

?

marianodaniel · ‎01-20-2022

Hello @Georg Pauwen ! My provider is A1

The output of sh run is the following:

Current configuration : 3473 bytes
!
version 12.4
no service pad
service timestamps debug uptime
service timestamps log uptime
service password-encryption
!
hostname MyHostname
!
boot-start-marker
boot-end-marker
!
no logging buffered
enable secret 5 
!
no aaa new-model
!
resource policy
!
!
!
no ip dhcp use vrf connected
ip dhcp excluded-address 10.10.10.1
!
ip dhcp pool CLIENT
   import all
   network 10.10.10.0 255.255.255.0
   default-router 10.10.10.1 
  lease 0 2
!
!
ip cef
ip inspect name myfw cuseeme timeout 3600
ip inspect name myfw ftp timeout 3600
ip inspect name myfw rcmd timeout 3600
ip inspect name myfw realaudio timeout 3600
ip inspect name myfw smtp timeout 3600
ip inspect name myfw tftp timeout 30
ip inspect name myfw udp timeout 15
ip inspect name myfw tcp timeout 3600
ip inspect name myfw h323 timeout 3600
!
!
!
partition flash 2 11 1
!
username privilege 15 password 7
username MyRouter password 7
!
! 
!
!
!
interface Ethernet0
 ip address 10.10.10.1 255.255.255.0
 ip access-group 122 out
 ip nat inside
 ip virtual-reassembly
ip tcp adjust-mss 1452
 hold-queue 100 out
!
interface Ethernet2
 no ip address
 shutdown
 hold-queue 100 out
!
interface ATM0
 no ip address
 atm vc-per-vp 64
 no atm ilmi-keepalive
 dsl operating-mode auto
 pvc 8/48 
  pppoe-client dial-pool-number 1
 !
!
interface FastEthernet1
 duplex auto
 speed auto
!
interface FastEthernet2
 duplex auto
 speed auto
!
interface FastEthernet3
 duplex auto
 speed auto
!
interface FastEthernet4
 duplex auto
 speed auto
!
interface Dialer1
 ip address negotiated
 ip access-group 111 in
 ip mtu 1492
 ip nat outside
 ip inspect myfw out
 ip virtual-reassembly
 encapsulation ppp
 ip tcp adjust-mss 1452
 dialer pool 1
 dialer remote-name redback
 dialer-group 1
 ppp authentication pap chap callin
 ppp chap hostname A1user
 ppp chap password 7
 ppp pap sent-username A1 user password 7
 ppp ipcp dns request
 ppp ipcp wins request
!
ip route 0.0.0.0 0.0.0.0 Dialer1
!
ip http server
no ip http secure-server
!
ip nat inside source list 102 interface Dialer1 overload
!
access-list 102 permit ip 10.10.10.0 0.0.0.255 any
access-list 102 permit ip 10.10.10.0 0.0.0.255 any
access-list 111 permit tcp any any eq telnet
access-list 111 permit icmp any any administratively-prohibited
access-list 111 permit icmp any any echo
access-list 111 permit icmp any any echo-reply
access-list 111 permit icmp any any packet-too-big
access-list 111 permit icmp any any time-exceeded
access-list 111 permit icmp any any traceroute
access-list 111 permit icmp any any unreachable
access-list 111 permit udp any eq bootps any eq bootpc
access-list 111 permit udp any eq bootps any eq bootps
access-list 111 permit udp any eq domain any
access-list 111 permit esp any any
access-list 111 permit udp any any eq isakmp
access-list 111 permit udp any any eq 10000
access-list 111 permit tcp any any eq 1723
access-list 111 permit tcp any any eq 139
access-list 111 permit udp any any eq netbios-ns
access-list 111 permit udp any any eq netbios-dgm
access-list 111 permit gre any any
access-list 111 deny   ip any any
access-list 122 deny   tcp any any eq telnet
access-list 122 permit ip any any
dialer-list 1 protocol ip permit
!
!
control-plane
!
!
line con 0
 exec-timeout 120 0
access-list 111 permit esp any any
access-list 111 permit udp any any eq isakmp
access-list 111 permit udp any any eq 10000
access-list 111 permit tcp any any eq 1723
access-list 111 permit tcp any any eq 139
access-list 111 permit udp any any eq netbios-ns
access-list 111 permit udp any any eq netbios-dgm
access-list 111 permit gre any any
access-list 111 deny   ip any any
access-list 122 deny   tcp any any eq telnet
access-list 122 permit ip any any
dialer-list 1 protocol ip permit
!
!
control-plane
!
!
line con 0
 exec-timeout 120 0
 no modem enable
 stopbits 1
line aux 0
line vty 0 4
 exec-timeout 120 0
 login local
 length 0
!
scheduler max-task-time 5000
end

Georg Pauwen · ‎01-20-2022

Hello,

first of all, try and remove the access lists from the interfaces:

interface Ethernet0
ip address 10.10.10.1 255.255.255.0
--> no ip access-group 122 out
ip nat inside
ip virtual-reassembly
ip tcp adjust-mss 1452
hold-queue 100 out

!

interface Dialer1
ip address negotiated
--> no ip access-group 111 in
ip mtu 1492
ip nat outside
ip inspect myfw out
ip virtual-reassembly
encapsulation ppp
ip tcp adjust-mss 1452
dialer pool 1
dialer remote-name redback
dialer-group 1
ppp authentication pap chap callin
ppp chap hostname A1user
ppp chap password 7
ppp pap sent-username A1 user password 7
ppp ipcp dns request
ppp ipcp wins request

If that does not help, change the PVC to 6/48:

interface ATM0
no ip address
atm vc-per-vp 64
no atm ilmi-keepalive
dsl operating-mode auto
pvc 6/48
pppoe-client dial-pool-number 1

marianodaniel · ‎01-20-2022

Darn, I did all changes, but did not work

Current configuration : 3534 bytes
!
version 12.4
no service pad
service timestamps debug uptime
service timestamps log uptime
service password-encryption
!
hostname cisco837
!
boot-start-marker
boot-end-marker
!
no logging buffered
enable secret 5 $1$3Tvm$.p5AfQZ/.jKhjwLv/geqY.
!
no aaa new-model
!
resource policy
!
!
!
no ip dhcp use vrf connected
ip dhcp excluded-address 10.10.10.1
!
ip dhcp pool CLIENT
   import all
   network 10.10.10.0 255.255.255.0
   default-router 10.10.10.1 
   lease 0 2
!
!
ip cef
ip inspect name myfw cuseeme timeout 3600
ip inspect name myfw ftp timeout 3600
ip inspect name myfw rcmd timeout 3600
ip inspect name myfw realaudio timeout 3600
ip inspect name myfw smtp timeout 3600
ip inspect name myfw tftp timeout 30
ip inspect name myfw udp timeout 15
ip inspect name myfw tcp timeout 3600
ip inspect name myfw h323 timeout 3600
!
!
!
partition flash 2 11 1
!
username CRWS_Sangeetha privilege 15 password 7 [password]
username cisco837 password 7 [password]
username CRWS_Giri privilege 15 password 7 [password]
!
! 
!
!
!
interface Ethernet0
 ip address 10.10.10.1 255.255.255.0
 ip nat inside
 ip virtual-reassembly
ip tcp adjust-mss 1452
 hold-queue 100 out
!
interface Ethernet2
 no ip address
 shutdown
 hold-queue 100 out
!
interface ATM0
 no ip address
 atm vc-per-vp 64
 no atm ilmi-keepalive
 dsl operating-mode auto
 pvc 6/48 
 !
 pvc 8/48 
  pppoe-client dial-pool-number 1
 !
!
interface FastEthernet1
 duplex auto
 speed auto
!
interface FastEthernet2
 duplex auto
 speed auto
!
interface FastEthernet3
 duplex auto
 speed auto
interface FastEthernet4
 duplex auto
 speed auto
!
interface Dialer1
 ip address negotiated
 ip mtu 1492
 ip nat outside
 ip inspect myfw out
 ip virtual-reassembly
 encapsulation ppp
 ip tcp adjust-mss 1452
 dialer pool 1
 dialer remote-name redback
 dialer-group 1
 ppp authentication pap chap callin
 ppp chap hostname [ADSL username]
 ppp chap password 7 [password]
 ppp pap sent-username [ADSL username] password 7 [password]
 ppp ipcp dns request
 ppp ipcp wins request
!
ip route 0.0.0.0 0.0.0.0 Dialer1
!
ip http server
no ip http secure-server
!
ip nat inside source list 102 interface Dialer1 overload
!
access-list 102 permit ip 10.10.10.0 0.0.0.255 any
access-list 111 permit tcp any any eq telnet
access-list 111 permit icmp any any administratively-prohibited
access-list 111 permit icmp any any echo
access-list 111 permit icmp any any echo-reply
access-list 111 permit icmp any any packet-too-big
access-list 111 permit icmp any any time-exceeded
access-list 111 permit icmp any any traceroute
access-list 111 permit icmp any any unreachable
access-list 111 permit udp any eq bootps any eq bootpc
access-list 111 permit udp any eq bootps any eq bootps
access-list 111 permit udp any eq domain any
access-list 111 permit esp any any
access-list 111 permit udp any any eq isakmp
access-list 111 permit udp any any eq 10000
access-list 111 permit tcp any any eq 1723
access-list 111 permit tcp any any eq 139
access-list 111 permit udp any any eq netbios-ns
access-list 111 permit udp any any eq netbios-dgm
access-list 111 permit gre any any
access-list 111 deny   ip any any
access-list 122 deny   tcp any any eq telnet
access-list 122 permit ip any any
dialer-list 1 protocol ip permit
!
!
control-plane
!
!
line con 0
access-list 111 permit esp any any
access-list 111 permit udp any any eq isakmp
access-list 111 permit udp any any eq 10000
access-list 111 permit tcp any any eq 1723
access-list 111 permit tcp any any eq 139
access-list 111 permit udp any any eq netbios-ns
access-list 111 permit udp any any eq netbios-dgm
access-list 111 permit gre any any
access-list 111 deny   ip any any
access-list 122 deny   tcp any any eq telnet
access-list 122 permit ip any any
dialer-list 1 protocol ip permit
!
!
control-plane
!
!
line con 0
 exec-timeout 120 0
 no modem enable
 stopbits 1
line aux 0
line vty 0 4
 exec-timeout 120 0
 login local
 length 0
!
scheduler max-task-time 5000
end

However, I see that:

cisco837#sho pppoe session 
     1 client session 

Uniq ID  PPPoE  RemMAC          Port                    VT  VA         State
           SID  LocMAC                                      VA-st
    N/A      0  0000.0000.0000  ATM0                   Di1  N/A        PADISNT 
                0000.0000.0000  VC:  8/48

and

cisco837#sho interfaces dialer 1
Dialer1 is up (spoofing), line protocol is up (spoofing)
  Hardware is Unknown
  Internet address will be negotiated using IPCP
  MTU 1500 bytes, BW 56 Kbit, DLY 20000 usec, 
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation PPP, loopback not set
  Keepalive set (10 sec)
  DTR is pulsed for 1 seconds on reset
  Last input never, output never, output hang never
  Last clearing of "show interface" counters 00:41:03
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: weighted fair
  Output queue: 0/1000/64/0 (size/max total/threshold/drops) 
     Conversations  0/0/16 (active/max active/max total)
     Reserved Conversations 0/0 (allocated/max allocated)
     Available Bandwidth 42 kilobits/sec
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     0 packets input, 0 bytes
     0 packets output, 0 bytes

Georg Pauwen · ‎01-20-2022

Helllo,

ok. Try:

pvc 8/35

marianodaniel · ‎01-20-2022

Still nothing Georg.

Is it normal that all PVC values are "stored" in some way?

interface ATM0
 no ip address
 atm vc-per-vp 64
 no atm ilmi-keepalive
 dsl operating-mode auto
 pvc 6/48 
 !
 pvc 8/35 
 !
 pvc 8/48 
  pppoe-client dial-pool-number 1
 !

Georg Pauwen · ‎01-20-2022

Hello,

you need to delete the previous pvc values, there should be only one value in there at any given time.

marianodaniel · ‎01-20-2022

Thank you @Georg Pauwen, I deleted all PVC values, and tried again with each value, and reloading the router; nothing.

I’ve been googling a template for this router and ADSL, but no luck.

I am sure I am messing up the ATM interface for some reason, or the ADSL configuration. Maybe the no modem enable line? The MTU maybe?

There’s something in there, just can’t figure out what

interface ATM0
 no ip address
 atm vc-per-vp 64
 no atm ilmi-keepalive
 dsl operating-mode auto
 pvc 8/35 

interface Dialer1
 ip address negotiated
 ip mtu 1492
 ip nat outside
 ip inspect myfw out
 ip virtual-reassembly
 encapsulation ppp
 ip tcp adjust-mss 1452
 dialer pool 1
 dialer remote-name redback
 dialer-group 1
 ppp authentication pap chap callin
 ppp chap hostname 9720461000
 ppp chap password 7 060A0D3659560E0816
 ppp pap sent-username 9720461000 password 7 1215070007130B1539
 ppp ipcp dns request
 ppp ipcp wins request