Cisco WAN :: Cannot Access Internet - Ping PC With 871W

Jul 23, 2012

I am new to Cisco and am studying for my CCENT certification. At the moment, I am attempting to correctly configure a Cisco 871W lab router. Since I have undertaken this task, I have run into nothing but problems. First off it was finding that the previous owner had left a password on it, having to purchase a new USB to DB9 adapter to pass the "break" sequence to the router, and then resetting the router in ROM Monitor mode.
 
Now, I cannot seem to configure the router correctly, and am quite stumped.
 
My ISP is Charter (cable internet), and the home network that I am using consists of a Motorola SBV5122 Digital Voice Modem, Motorola SB6120 Cable modem, and, ideally, should also include my Cisco 871W router.
 
When I connect my router to the SB6120 Cable modem, the router receives an IP address via DHCP and the WAN indicator light turns on.
 
I have a VLAN configured on the 4 switchports of the router, and it is setep to act as a DHCP server. However, when I connect my PC to rhe router via Cat5e Crossover cable, I cannot access the internet. The router gives the PC an IP address, yet all attempts to ping the PC from the router fail. Somehow, I can connect to the router via SSH though.
 
Furthermore, I can ping the 127.0.0.1 loopback address from my PC, but cannot do so from the router.
 
how to correctly configure this router to function as intended in my network situation, however, this is proving to be seemingly unsurmountable!
 
I have attached the config of my router along with both outputs and commands relating to my predicament.

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Cisco WAN :: 871w Cannot Ping Website On Internet

Jan 15, 2013

I have a cisco 871w router that I'm trying to incorporate into an existing network. I have FastEthernet4 (WAN port) plugged into an ISP device, which I don't have access to. I have the address set to use dhcp, which is successfully recognized and I see that the interface gets a valid ip address that I can ping with other computers on the same network.
 
Problems: I am logged into the router via the serial port and I cannot ping websites on the internet. I am able to ping sites that are hosted inside the WAN, but when I try "google.com" for instance, I see it sending out packets, but none are received. It resolves the hostname from the local DNS server, but there are no packets received.
 
I type into the console to set up the router. I'm missing a lot of stuff. This is what I've been able to piece together using google and the software manuals:
 
enable
config t  
hostname [hostname]
interface FastEthernet 4

[Code].....

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I have an 871 set up at home with 2 VLANs, both of these vlans present a strange behavior where an user is unable to ping/contact another user on the same subnet, however if users are on different subnet it seems to work [code]
 
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[code]....

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SUBNET: 255.255.248.0
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75.75.76.76

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Cisco871W#show config
Using 2631 out of 131072 bytes
!
version 12.4
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption

[codde].....

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Point38#show          run
Building          configuration...
 Current          configuration          :          4072          bytes
!
!          Last          configuration          change          at          16:23:18          UTC          Thu          Sep          8          2011
version          15.1
no          service          pad

[code]...

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[code]...

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Jul 8, 2012

Recently, I purchased a Cisco 871W Router with which to practice/study for my CCENT with. Since I have made the purchase, it has given me nothing but headaches.
 
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Terminal Emulator: Tera Term
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