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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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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Apr 14, 2011
We have a Cisco 871W working as PIX, controlling external VPN connections to our private network.The configuration is very similar to the one described here - "Cisco Router as a Remote VPN Server using SDM Configuration Example" url...
About once a week, it stops working, without aparent external intervention.The ping to the external IP stops answering, and the internal IP stops answering pings also.The solution is power-off and power-on, and it starts working again ...
What is the correct way to debug this situation ?I can connect a HyperTerminal using direct cable to the 871, but dont know the relevant commands to debug this situation.
Is there any LOG I can have a look into ? Yes, I am quite new to Cisco world .By the way : "show version" says Cisco IOS Software, C870 Software (C870-ADVSECURITYK9-M), Version 12.4(15)T7, RELEASE SOFTWARE (fc3)
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Jul 28, 2012
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]
According to the troubleshooting that I have done, the issue seems to be with the broadcast traffic, ARP request/reply do not reach another host on the same subnet (wireless to wireless or wired to wireless) however if the wireless device iniciates the connection to wired, it works fine.
I have tried to enable proxy arp on the different VLANs and BVI and different combinations but no sucess in order to get traffic across 2 wireless devices on the same subnet or a connection that is iniciated for a wired client to a wireless one.
I tried enabling and disabling dot11 arp-cache but no luck.
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Jun 6, 2012
I have a Cisco 871 router at one of my client sites.(they purchased the router from me and I sent them the router with a basic configuration on it). When they connect it after hours clients get the proper IP addresses and dhcp configuration however are unable to access the internet.We are connecting their ISP supplied router to Gigabitethernet0. They have a static address. I have been through the confirmation many times and am thinking I am missing something so simple.
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Apr 25, 2012
I have an 871w set up to add wireless connectivity to an existing network. When adding a client to the physical interfaces to test VLAN internet connectivity, however, a DHCP address is assigned but internet traffic on the terminal never reaches the network nor does the network recognize the IP the terminal shows as being 'connected'. Also, pings sourced from the VLAN do reach destinations. I've attached my config file, I think it's a routing issue of some kind.
10.26.99.0 is the existing network. 10.26.99.1 is an existing 871w router set as the DHCP server for that network and 10.26.99.10 is a Windows Server 2003 DNS box. VLAN 2 and DHCP pool alpha were control sets for trialing DNS settings.
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Mar 14, 2013
I've been trying to get my wireless configured for the past few days with no luck. I can ping every device on my local network and I can ping outside my network and surf the web. My wireless devices can see my wireless network but cannot connect to it.
[code]....
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Sep 20, 2011
About twice a day (that I notice) my wireless loses its internet connection. All the wired machines continue to be connected to the internet but any wireless ones lose internet, though they maintain a connection with the router.
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Sep 19, 2009
I use a Cisco 871W router for my office in home -- I have Wifi working and want to add my new Blu-Ray player to the network -- I bought a WAP54G to use as a wireless bridge assuming i woudl just connect the WAP to the BLU-Ray with a ethernet cord. The instructions for installation of the WAP include connecting it to my router for the set up but the installation disk says it is not recognizing the WAP. I use Brighthouse for my ISP and the connection sequence is BH Modem to teh Cisco 871W -- the 871W directly connects to my CPU and to a Net gear FS105 fast network Switch -- the swicth connects to my VOIP phone , HP printer and external HD back-up system -- there is an open port onthe FS105 and two open LAN ports on the 871W.
I tried to install the WAP but connecting it to both the router and the swtich without luck. Is the WAP what I need to connect the Blu-Ray --- am i missing something in the set up?
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May 5, 2013
I've just started styding for CCNA. Bought a router 871W recently and spent two days straight trying to configure internet connection with no luck! I use console port to do the configs and SDM/CCP. How to do simple internet connection configs. I googled everything but it's still confusing. I can't assing any IP to FA ports 0 - 3. I used VLAN instead. But all tutorials use FA0 and when I try to assign an IP to FA0 it gives me some L2 can't be assigned or something... :/ And I'm also confused what IP address should I use for WAN. I plugged the cable from Modem to PC's LAN port and wrote down some IP addresses which I think I'll have to use to configure the router for internet connection. And here they are:
ISP IP: 76.114.54.255
SUBNET: 255.255.248.0
GATEWAY: 76.114.48.1
DHCP: 69.252.97.4
DNS: 75.75.75.75
75.75.76.76
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Mar 8, 2011
I have a Cisco 871w that has been a very great product for many years. I recently switched to Windows 7 x64 on my main machine and now i am having all sorts of issues with it.. I have done a bit of research and found that it appears that it might be the firewall on the SDM that is causing the slowness issues. what does happen is that downloads from known good sites will run really slow. If i hook up my Macbook Pro or my Windows XP laptop i have no issues at all. i have tried Disabling IPv6 as well as SMB2.0 and this has not resulted in a fix at this point.
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Apr 17, 2011
I was able to go onto the internet with no problem. I've been searching forums trying to solve my problem but to no avail. I have Windows XP installed, I can connect to the LAN network but I cannot go online. I can ping the gateway but not the DNS as well as other address name or ip address. This is the output of ipconfig /all:
Description : Realtek RTL8139/810x Family Fast Ethernet NIC
Dhcp Enabled : Yes
Autoconfiguration enabled: Yes
IP address: 192.168.1.145
Subnet mask: 255.255.255.0
Default Gateway : 192.168.1.1
DHCP Server : 192.168.1.1
DNS Servers : 202.160.8.2
202.160.6.20P.s: All the other computers in the LAN can connect to the internet.
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Jan 23, 2011
I have a home network of 3 cmputers. DHCP from router. 1 computer is not getting address. But if I assign it one, with same gateway and dns(not a duplicate ip of others), it can ping internally, and outside. I can do tracert to 8.8.8.8 and ping it (google DNS). But I can't get to internet. So - i can get out, but nothing coming in. I have checked firewall.
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Jul 18, 2011
I have 1 PC and 2 laptops. All are connect to the WAG160N router. All 3 can access the internet but they cannot see each other, not even by ping.I have turned my Kaperksy internet Security off and this makes no difference. Windows Firewall is turn off.
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Jul 26, 2011
I am having a problem configuring my ASA 5505 for NAT.
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Aug 23, 2011
So I have a laptop that wont connect to the internet, my other laptop works fine using the same router.I can ping google.com and yahoo.com fine. Intel(R) PROSet/Wireless says connected but no internet. I cant use a network cable to connect either. Laptop: DELL XPS M1210, Windows XP, Service Pack 2..[code]
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Jan 4, 2011
I am using the default configuration at this point. I just connected 1 computer using the default IP with DHCP on the RV042 router. 192.168.1.0/255.255.255.0.I connect my wildblue satalite modem using a static IP address 75.106.203.xxx / 255.255.252.0 I can ping the RV042 router and the static IP address of the wildblue router but I can't ping the gateway on the wildblue side. Either from the PC or the Router diag tools.
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Mar 30, 2013
Belkin N750 Router - wired connection can not access Internet. I've tried direct to modem and have no problem, have tried old router, no problem, but if I shut down desktop completely (Win7) and restart, I get no connection. Uninstalling the NIC (Intel 82579V Giga) and restarting, then I get connection again. However, if I start in safe mode with networking, I have no problems at all. I've disabled my firewall to no avail.
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Nov 17, 2012
I have a WRT54G that has worked fine for years, with some PCs hooked up with Ethernet and various other devices connected wirelessly. I came home this afternoon and nothing going through the router could connect to the internet. I've made no changes to anything recently.
I did troubleshooting with Comcast, and we determined that when their modem was hooked up directly to my computer then that computer could connect to the net. Problem solved as far as they are concerned--my router is busted. But I can still connect to the router, and enter its admin screen, and everything looks fine there. The computers on the router can all see each other. So the router is working.
Once I hooked it back up to the modem my computers all lost their internet, but the router does get an IP successfully from Comcast. And it even assigns IPs to my computers that are hooked up to it. It's just that for some reason they still cannot get past the router.I used the ping function in the router admin site and the router pinged Google no problem. My PCs can ping the router without difficulty. But the computers cannot ping Google.
I've tried every combination of power cycles and reboots you can name. I've tried duplicating the MAC address of the PC that connected to the internet onto my router. None of it has made any difference.
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Jan 18, 2013
From My Router that connects to Cable modem i am unable to ping website 4.2.2.2I am able to ping all other websites fines.Same website i can ping from my pc and all other switches fine.Router has only 1 ACL thats for NAT.
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Jan 4, 2013
I am a bit green with IOS and have exhausted everything I can think of with this. The router passes the WAN test in CCP?Undoubtedly there are probably a few things in the config that are either redundant or totally unnecessary, but I have been trying a few things to solve this with very little success.I have no security stuff in here because I have triewd to keep the config as simple as possible to start with. I will add that after I get the routing working.
Here is my most recent config:
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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Aug 9, 2011
I bought an 871w second hand with 124-24T IOS on it. I would like to enable QoS. When I use Cisco Configuration Professional to manage the router I click on QoS and it says it is not available. I know that the router itself is QoS capable.
This is my first time dealing with a router such as this and I wonder what I need to do to enable QoS.
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Sep 18, 2011
I want to upgrade my IOS on an 871W. In order to do this I need to upgrade the memory. I have found that I need the MEM870-32F (Am I correct?).
As in here: {URL}. So if I follow these instructions: {URL}. Is that all there is to it?
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Jan 16, 2011
As soon as I add the interfaces of the router to security zones it significantly drops speed on WAN interface, below 1 Mbs. I noted this because I wasn't able to watch youtube. Moreover the bandwidth test from speedtest.net hangs and doesn't come to a result. Here below is the diagnostic example while doing that test. The question is what is going on? I have two iPhones and three computers in my network, that's it. My ISP bandwidth is 10 Mbs, so is this the router hardware limitations, or kind of malfunction or some misconfiguration down here? What could be done here ?
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Sep 23, 2012
I have a small wireless network, which consists of three AP1121G with c1100-k9w7-mx.123-8.JEB1 ios and one 871w with c870-advipservicesk9-mz.124-24.T1. I've configured two different ssid's with individual authorisation types - ssid_1 with eap, ssid_2 with wpa. All three ap's works as it should be, but 871w authorises only eap connections, and all other types are rejected
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Jul 9, 2012
Is it possible to make Any Connect VPN from IPad/iPhone to 871w? IPSec VPN is working perfectly but cant get my Cisco AnyConnect iOS client to connect. I have config webvpn and it beeing user/pw prompted but keep getting the following error:
"the required license for this type of VPN client is not avaiable on the Secure gateway. Please contact Your network administrator".
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May 12, 2013
I'm trying to configure WiFi on my Cisco 871w router withouth any knowledge in this area. And it's a tough one, couldn't do it just with google, hope this is the place where I can get it done right step by step if possible. Everything else works fine. I'm going to post my messy show run below. Everything I did on dot11Radio will need to be cleared I suppose.
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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Aug 21, 2012
Below is my VPN config in my 871 and radius user config. I am unable to connect to the vpn using Cisco vpn client. I am getting one of two errors depending on what config changes I make.I believe I have the radius configured correctly because it is authentication but not 100% sure.
[code]...
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Oct 10, 2012
I've acquired an 871W, because I'd like to use wireless, to replace my 851. I Ft Pd the 851's configuration to my FTP server and then Ft Pd this to the 871W. Save for the fact that this has a radio interface (currently shutdown), everything works save for FTP from the outside. I can not even telnet to port 21 of any of the internal FT servers. I can telnet to any other port (ssg, smtp, HTTP, https, etc.) but FTP will not pass. What's the difference?
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Nov 5, 2012
I have a problem with myself a few other clients randomly disconnecting from my 871W. It appears that I am still associated but Windows 7 shows "Limited Access". I appear to be assosciated to the AP and I still have my ip address but I can't ping the 192.168.1.1 gateway (871W). I have also set my power plan to allow for Maximum Performance which I thought disabled PSP but the log is still showing errors.As a final note, after I reconnected by ip address (192.168.1.107) doesn't show up in "sh ip dhcp bindings" but I'm working.To correct the situation, I have to disconnect and the reconnect to the AP and then I am good for another day or close to it. Below are the log errors, config and a sh ver. [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.
I cannot access the router to configure it, as the previous owner has a password set on it to access enable mode, which he/she has forgotten.
Here is the message that I receive when I attempt to log in into the router, to access enable mode. [URL]
Apparently there is supposed to be a one-time username and password of "Cisco", but this is not the case.
I have tried to do a password recovery, following this post discussion thread: [URL]
Unfortunately, this has not worked, and I am sure that I am doing something incorrectly. I am connected to the router via console cable and have tried power cycling the router and entering the break sequence, power cycling again, and then holding the space bar down for 15 seconds. The preceding has produced no results to speak of. Following, I set my terminal emulator, Tera Term, to the baud rate of 1200, power cycled the router, and held down the space bar for 20 seconds. I then immediately set the baud rate back to 9600. Nothing occurred, once again.
Furthermore, I have followed the password recovery instructions set forth by Cisco. [URL]
Nothing has come of these methods, either, and I do not see how they would work, or even apply to my situation, as Cisco seems to imply they should, as I cannot get into enable mode, let alone privileged mode or conf t mode, as the guidelines require.
Here is some info for troubleshooting:
OS: Win 7 HP 64 bit
Terminal Emulator: Tera Term
Router is not currently connected to any sort of internet connection. Only the power cord and console cable are properly connected.
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Apr 16, 2012
I have a Cisco 871W that periodically will drop its signal. how to configure this for maximum reliability? I set it to use chanel 2462.
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Nov 7, 2012
I've a problem with my 871W. I can connect to the router by inside interfaces (LAN & WLAN) but not on WAN (Fa4). My client on the WAN is on the same subnet and I can ping 871.
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