04-09-2008 06:56 AM - edited 03-05-2019 10:17 PM
Hi,
I have got a cable modem (model above) connected via ethernet to a C871 with 1 Fastethernet port and 4 L2 ports.
I have configured the following so that I can ping the gateway of my ISP. I have been given a static IP address.
Router#sh run
Building configuration...
Current configuration : 899 bytes
!
version 12.4
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname Router
!
boot-start-marker
boot-end-marker
!
no aaa new-model
!
resource policy
!
ip subnet-zero
ip cef
!
!
interface FastEthernet0
!
interface FastEthernet1
!
interface FastEthernet2
!
interface FastEthernet3
!
interface FastEthernet4
description OUTSIDE
ip address 82.x.x.72 255.255.255.240
ip access-group 100 in
ip access-group 100 out
duplex auto
speed auto
!
interface Vlan1
no ip address
!
no ip classless
ip route 0.0.0.0 0.0.0.0 82.45.180.69
!
!
no ip http server
no ip http secure-server
!
access-list 100 permit ip any any log
access-list 100 deny ip any any log
!
!
control-plane
!
###############################
I am unable to ping the GW address but I can ping this GW if the cable modem is connected straight into my PC.
Can anyone suggest why? I tried using both cross-over and straight between the cable modem and the router. Same outcome.
Thanks
04-10-2008 01:16 AM
After you connect the cisco 871 to the cable modem, call the ISP and tell them to clear cable host or to reset the modem and clear the arp's.
04-10-2008 01:31 AM
Problem was resolved by turning off the modem for 30 seconds whilst having the router off as well. Then turning the modem back on followed by the router. This was necessary since there modem has some type of mac-address-lock down mechanism only accepting the 1st MAC after initial bootup. My laptop was initally used to test connectivity hence the router was not being allowed through.
Thanks for your help anyway
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