Question

SETUP CISCO 877 WITH MY DSL PROVIDER

Asked by: gonzalez9334

Hi,


I have CISCO871W-G-A-K9, I used AT&T as my DSL provider, I did the following

I un plugged the modem, and connected directly into the back of the CISCO router labeled ASDSL. THEN I used SDM GUI, to configure the DSL.


I FOLLOW THESE STEPS& I USED new connection, it asked me for an I.P&. I gave the IP 192.168.1.64 that what it shows before on my modem.

Then the subnet.255.255.255.0. Then my DNS. Which is 192.168.1.254.

Then it asked me for my CHAP/PAP authentication. Which I provide by my AT&T,&. After Im done it asked me to test the connection. The results I have, it said

Pinging to destination host. THEN IT FAILS.. this is the only item the fails. The rest of them passed, it looks like is testing the Ethernet and thats when it fails.

Any suggestions, my understanding is that I can use this CISCO 877 as a modem, to replace my DSL modem. And only use CISCO.

Using SDM, I figured out. How to put the IP, now it passed, but NOW this is the failing part.  Here is the message.



Failure Reason(s)
To test connectivity, SDM tries to ping the configured DNS servers. However, there is no configured route to any of the DNS servers through the selected interface.

HERE IS THE RECOMMENDATIONS.
Select 'User-specified' option or add a 'host specific/network specific/default' route through this interface and retest connection.
Please help.

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Asked On
2009-02-22 at 02:09:14ID24165936
Topics

Wireless Technologies

,

Developer Tools

,

DSL Lines / Cable Internet

Participating Experts
2
Points
500
Comments
4

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Answers

 

by: gonzalez9334Posted on 2009-02-22 at 05:23:02ID: 23704617

Using SDM, I figured out. How to put the IP, now it passed, but NOW this is the failing part.  Here is the message.



Failure Reason(s)
To test connectivity, SDM tries to ping the configured DNS servers. However, there is no configured route to any of the DNS servers through the selected interface.

HERE IS THE RECOMMENDATIONS.
Select 'User-specified' option or add a 'host specific/network specific/default' route through this interface and retest connection.

 

by: Press2EscPosted on 2009-02-23 at 04:56:13ID: 23710566

Yes, the Cisco 877 can function as a DSL router..  However, be aware that any device that provides the DSL req'd PPP authentication (Cisco included) must ONLY provide the DSL user login name & pwd, along with the correct VPI/VCI (Virtual Path/Ciruit ID)

Do NOT try and assign a static IP to the outside (WAN, Dialer1) address of the router.  When properly authenticated, the router will receive an public IP and corresponding (2) DNS servers IPs from the ISP.

 

by: atnextcPosted on 2009-03-02 at 00:38:43ID: 23772426

Below is a working config from a Cisco 1721 that si being used as a DSL modem. Of course you "have to" know the CLI, but if you edit the appropriate parts. IE just the "chap username and password" portion it should work just fine.

Let us know how it turns out.

FYI
ATT's VPI and VCI are 8/35

service timestamps debug datetime msec
 
service timestamps log datetime msec
 
service password-encryption
 
!
 
hostname R1
 
!
 
logging queue-limit 100
 
 
!
 
ip subnet-zero
 
!
 
vpdn enable
 
!
 
vpdn-group pppoe
 
!
 
interface ATM0
 
 no ip address
 
 no atm ilmi-keepalive
 
 dsl operating-mode auto 
 
 hold-queue 224 in
 
 no shut
 
!
 
interface ATM0.1 point-to-point
 
 pvc 8/35 
 
  pppoe-client dial-pool-number 1
 
 !
 
!
 
interface FastEthernet0
 
 ip address 192.168.1.1 255.255.255.0
 
 ip nat inside
 
 load-interval 30
 
 speed auto
 
 no shut
 
!
 
interface Dialer1
 
 ip address negotiated
 
 ip mtu 1492
 
 ip nat outside
 
 encapsulation ppp
 
 dialer pool 1
 
 ppp chap hostname user@att.net
 
 ppp chap password password
 
 ppp ipcp dns request
 
!
 
ip nat inside source list 1 interface Dialer1 overload
 
ip classless
 
ip route 0.0.0.0 0.0.0.0 Dialer1
 
no ip http server
 
!
 
!
 
access-list 1 permit 192.168.1.0 0.0.0.255
 
!
 
!
 
line con 0
 
line aux 0
 
line vty 0 4
 
 transport input telnet
 
!
 
no scheduler allocate
 
!
 
End

                                              
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