Solved: Re: Please help to configure 871W Router for internet connectio - Page 2

David Belmont · ‎05-06-2013

Hi, everybody!

I've just started styding for CCNA, so I'm totaly new to Cisco stuff. 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. Would be greateful if somebody could tell me 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

If you can, please help! Thanks!

johnlloyd_13 · ‎05-08-2013

hi david,

cool! glad internet now works on the 871w router.

post 'ipconfig/all' from your PC and 'show ip nat translations' from 871w.

remember to rate useful posts so far. thanks!

edit: forget about nat table. does the same symptom happen with another PC? could be PC FW issue and may need to be disabled to do pings.

David Belmont · ‎05-08-2013

I've never been happier, no more sleepless nights. Thank you John and everyone else!

Funny thing, I've tried to plugin another PC to FA1 and also tried FA0 and it works no problem! I can ping from PC, there is internet connection etc. They both have Win XP, tried disableding firewall on nonworking PC, didn't help. But I don't think it's a problem since I was able to ping from PC1 before and now I just can't. I've noticed only once difference between 2 PCs which is:

PC1 (No Ping): Connection-specific DNS Suffix . : local.domain

PC2 (Ping Ok): Connection-specific DNS Suffix . : hsd1.ca.comcast.net.

When I connect PC2 back to Belkin router in works.

_____________________________________________________________________________________________________

PC1: (Ping OK)

Windows IP Configuration

Host Name . . . . . . . . . . . . : PC1

Primary Dns Suffix . . . . . . . :

Node Type . . . . . . . . . . . . : Unknown

IP Routing Enabled. . . . . . . . : No

WINS Proxy Enabled. . . . . . . . : No

DNS Suffix Search List. . . . . . : hsd1.ca.comcast.net.

Ethernet adapter Local Area Connection 2:

Connection-specific DNS Suffix . : hsd1.ca.comcast.net.

Description . . . . . . . . . . . : Marvell Yukon 88E8040 PCI-E Fast Eth

ernet Controller

Physical Address. . . . . . . . . : 00-24-54-1E-1D-FC

Dhcp Enabled. . . . . . . . . . . : Yes

Autoconfiguration Enabled . . . . : Yes

IP Address. . . . . . . . . . . . : 192.168.1.3

Subnet Mask . . . . . . . . . . . : 255.255.255.0

IP Address. . . . . . . . . . . . : fe80::224:54ff:fe1e:1dfc%6

Default Gateway . . . . . . . . . : 192.168.1.1

DHCP Server . . . . . . . . . . . : 192.168.1.1

DNS Servers . . . . . . . . . . . : 75.75.75.75

75.75.76.76

fec0:0:0:ffff::1%1

fec0:0:0:ffff::2%1

fec0:0:0:ffff::3%1

Lease Obtained. . . . . . . . . . : Wednesday, May 08, 2013 9:41:19 PM

Lease Expires . . . . . . . . . . : Thursday, May 09, 2013 9:41:19 PM

Tunnel adapter Teredo Tunneling Pseudo-Interface:

Connection-specific DNS Suffix . :

Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface

Physical Address. . . . . . . . . : FF-FF-FF-FF-FF-FF-FF-FF

Dhcp Enabled. . . . . . . . . . . : No

IP Address. . . . . . . . . . . . : fe80::ffff:ffff:fffd%5

Default Gateway . . . . . . . . . :

NetBIOS over Tcpip. . . . . . . . : Disabled

Tunnel adapter Automatic Tunneling Pseudo-Interface:

Connection-specific DNS Suffix . : hsd1.ca.comcast.net.

Description . . . . . . . . . . . : Automatic Tunneling Pseudo-Interface

Physical Address. . . . . . . . . : C0-A8-01-03

Dhcp Enabled. . . . . . . . . . . : No

IP Address. . . . . . . . . . . . : fe80::5efe:192.168.1.3%2

Default Gateway . . . . . . . . . :

DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1

fec0:0:0:ffff::2%1

fec0:0:0:ffff::3%1

NetBIOS over Tcpip. . . . . . . . : Disabled

___________________________________________________________________________________________________

PC2: (No Ping)

C:\Documents and Settings\Administrator>ipconfig /all

Windows IP Configuration

Host Name . . . . . . . . . . . . : PC2

Primary Dns Suffix . . . . . . . :

Node Type . . . . . . . . . . . . : Unknown

IP Routing Enabled. . . . . . . . : No

WINS Proxy Enabled. . . . . . . . : No

DNS Suffix Search List. . . . . . : local.domain

Ethernet adapter Local Area Connection 4:

Connection-specific DNS Suffix . : local.domain

Description . . . . . . . . . . . : Realtek RTL8169/8110 Family Gigabit

Ethernet NIC

Physical Address. . . . . . . . . : 00-01-4A-F9-8B-83

Dhcp Enabled. . . . . . . . . . . : Yes

Autoconfiguration Enabled . . . . : Yes

IP Address. . . . . . . . . . . . : 192.168.1.2

Subnet Mask . . . . . . . . . . . : 255.255.255.0

Default Gateway . . . . . . . . . : 192.168.1.1

DHCP Server . . . . . . . . . . . : 192.168.1.1

DNS Servers . . . . . . . . . . . : 75.75.75.75

75.75.76.76

Lease Obtained. . . . . . . . . . : Wednesday, May 08, 2013 9:40:41 PM

Lease Expires . . . . . . . . . . : Thursday, May 09, 2013 9:40:41 PM

____________________________________________________________________________________________________

Router#show ip nat translations

Pro Inside global Inside local Outside local Outside global

tcp 76.114.54.255:4417 192.168.1.3:4417 74.125.239.80:443 74.125.239.80:443

udp 76.114.54.255:52473 192.168.1.3:52473 75.75.75.75:53 75.75.75.75:53

udp 76.114.54.255:53216 192.168.1.3:53216 75.75.75.75:53 75.75.75.75:53

udp 76.114.54.255:55272 192.168.1.3:55272 75.75.75.75:53 75.75.75.75:53

udp 76.114.54.255:55682 192.168.1.3:55682 75.75.75.75:53 75.75.75.75:53

udp 76.114.54.255:56196 192.168.1.3:56196 75.75.75.75:53 75.75.75.75:53

udp 76.114.54.255:56341 192.168.1.3:56341 75.75.76.76:53 75.75.76.76:53

udp 76.114.54.255:56542 192.168.1.3:56542 75.75.75.75:53 75.75.75.75:53

udp 76.114.54.255:57167 192.168.1.3:57167 75.75.75.75:53 75.75.75.75:53

udp 76.114.54.255:58632 192.168.1.3:58632 75.75.75.75:53 75.75.75.75:53

udp 76.114.54.255:58865 192.168.1.3:58865 75.75.75.75:53 75.75.75.75:53

udp 76.114.54.255:61269 192.168.1.3:61269 75.75.75.75:53 75.75.75.75:53

udp 76.114.54.255:64002 192.168.1.3:64002 75.75.75.75:53 75.75.75.75:53

udp 76.114.54.255:65327 192.168.1.3:65327 75.75.75.75:53 75.75.75.75:53

Router#

Router#show mac-address-table

Destination Address Address Type VLAN Destination Port

------------------- ------------ ---- --------------------

0001.4af9.8b83 Dynamic 1 FastEthernet1 (PC2: No Ping)

001f.ca6b.d8be Self 1 Vlan1

0024.541e.1dfc Dynamic 1 FastEthernet0 (PC1: Ping OK)

Router#show ip int brief

Interface IP-Address OK? Method Status Protocol

FastEthernet0 unassigned YES unset up up (PC2 which has internet connection)

FastEthernet1 unassigned YES unset up up (PC1 no internet connection)

FastEthernet2 unassigned YES unset up down

FastEthernet3 unassigned YES unset up down

FastEthernet4 76.114.54.255 YES DHCP up up

Dot11Radio0 unassigned YES TFTP administratively down down

Vlan1 192.168.1.1 YES NVRAM up up

NVI0 unassigned YES unset up up

Virtual-Dot11Radio0 unassigned YES TFTP administratively down down

Router#

johnlloyd_13 · ‎05-08-2013

Hi David,

I'm glad you're sleeping soundly now. It reminds me of my sleepless nights at work sometimes (not to scare you off).

But let's try to tshoot your PC. Is my understanding correct?

PC1: can ping 871 but no web
PC2: can't ping 871 but has web

Have you tried 'ipconfig/release then /renew. Do you have a win 7 machine or a mac to test?

I've noticed PC1 LAN card supports IPv6 while the other doesn't. Could be a driver issue and may need to update.

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David Belmont · ‎05-09-2013

That's weird, PC2 doesn't want to accept any other connection besides Belkin router.

PC1: can ping 871 and it has web (this is the one that supports IPv6)

PC2: can't ping 871 there is no web. And I was able to ping 871w from PC2 before I added MAC to FA4. Don't know if that's a coincidence or not, though. But I think that has nothing to do with this since PC1 is pingable.

Nope, I don't have a win 7 or a mac machines...

Have tried to uninstall the driver but Windows installed some other or the same backup driver automaticaly right away. I did ipconfig /all on PC2 and there was a change made:

Before: DNS Suffix Search List. . . . . . : local.domain

After: DNS Suffix Search List. . . . . . : hsd1.ca.comcast.net. Same as PC1 but still not pingable.

johnlloyd_13 · ‎05-09-2013

Hi David,

From your PC2's ipconfig, I think we've statically put its MAC address for the 871w FE4.

Could you capture the Belkin's WAN/Internet port's MAC add and swap it on 871w instead?

int f4
no mac-add PC2 MAC
mac-add BELKIN

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David Belmont · ‎05-09-2013

Hi John!

Before I do any changes let me clarify what we did.

I went to see my Modem's configurations and noticed this:

#	Known CPE MAC Address (Max 1)	Status
1	00:01:4A:F9:8B:83	Dynamic

And this is my PC2's MAC address. And yes we've statically put it for the 871w FE4. And established internet connection this way but lost ping, not sure about ping as I said before.

This is Belkin's MAC:

08:86:3B:AD:6D:0D

do you want me to use it and replace the one we added before (PC2)?

Bilal Nawaz · ‎05-09-2013

Hello David, the MAC address on FE4 should be this: 001f.ca6b.d8c8

As this is the MAC address of the router itself. I could see that you had configured your interface to have a mac of the Sony device I think. But we do not want that.

Try changing it to the mac mentioned above and see if it works.

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Edgar Khachatrian · ‎05-09-2013

Who is your ISP?

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David Belmont · ‎05-10-2013

Hi everybody,

yesterday just when I wanted to reply I've lost my internet connection on 871w, wanted to tell you that it works but apparently not. It's got even weirder.

Ed Kh: Comcast is my ISP.

Bilal: could you please explain to me how do I figure out my 871w's MAC and why its MAC needs to be on FE4?
You are right btw it is Sony device (My PC2) and I've added its MAC to FE4 and my PC2 became pingable. But what happens next is every 10 mins or so I loose connection to my 871w router and it's not pingable anymore but I can ping any web address from the router itself. And to establish connection between my 871w router and PC2 again I need to do this every time when I loose my connection:

Router(config-if)#no mac-address 0001.4af9.8b83 (NO needs to be done before next step, otherwise it won't work.)

Router(config-if)#mac-address 0001.4af9.8b83

So, I don't understand why do I need to add my PC2s MAC to FE4 of my router when PC1 works just fine without adding one...

_______________________________________________________________________________________________

Current FE4 configs.

PC2#show int fa4

FastEthernet4 is up, line protocol is up

Hardware is PQUICC_FEC, address is 0001.4af9.8b83 (bia 001f.ca6b.d8c8)

Internet address is 76.114.54.255/21

MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

reliability 255/255, txload 10/255, rxload 2/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Full-duplex, 100Mb/s, 100BaseTX/FX

ARP type: ARPA, ARP Timeout 04:00:00

Last input 00:00:00, output 00:00:00, output hang never

Last clearing of "show interface" counters never

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 1176000 bits/sec, 277 packets/sec

5 minute output rate 4198000 bits/sec, 446 packets/sec

874097 packets input, 667629792 bytes

Received 89585 broadcasts, 0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

0 watchdog

0 input packets with dribble condition detected

1028371 packets output, 1056901816 bytes, 0 underruns

0 output errors, 0 collisions, 3 interface resets

0 babbles, 0 late collision, 0 deferred

0 lost carrier, 0 no carrier

0 output buffer failures, 0 output buffers swapped out

Bilal Nawaz · ‎05-10-2013

Hello, your mac address for the actual router interface is displayed in show interface fe4

show int fa4
FastEthernet4 is up, line protocol is up
Hardware is PQUICC_FEC, address is 0001.4af9.8b83 (bia 001f.ca6b.d8c8)

Here we can see that the BIA (burnt in address) is a MAC address of a Cisco device - being the router itself. However, because you have configured it to use the MAC address of the Sony device the router is now using that to communicate with the modem. 0001.4af9.8b83 belongs to your sony device. So the router will see the MAC address of the Sony device, but it may get confused because its own MAC address is configured to be the same!

The MAC address should be FE4 so it can get an IP from the modem as 'itself' and not appear to be the Sony device.

It's working with PC1 because you're not using the MAC address of PC1, so I think this is what's happening! :-)

Router(config-if)#mac-address 001f.ca6b.d8c8

So please try this and see if there are any changes in the results

Hope this helps.

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Bilal Nawaz · ‎05-10-2013

Once you've made the changes, it would be best to save the config, and reboot the router so it comes up in a 'clean state'

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Edgar Khachatrian · ‎05-10-2013

If you can ping any web site from the router than make sure under the dhcp_pool config you have a dns server setup...

Also double check you NAT config.....

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David Belmont · ‎05-11-2013

Hello everybody,

Bilal: thank you for a brief explanation it totally makes sense! I do use my PC2s MAC on FE4 because my modem's CPE port learned my PC2s MAC for good and there is only one allowed! Maybe that's why I'm losing connection to my router every 10 mins only from PC2! I've tried to reset my Motorola SB6141 to defaults so it could learn my 871w MAC instead but nothing happened! And I couldn't find any firmware on their website. Thx again for explanation, helped a lot!

Ed Kh:

My DNS server configs are: 75.75.75.75

75.75.76.76

Not sure about NAT:

Point38#show ip nat statistics

Total active translations: 107 (0 static, 107 dynamic; 107 extended)

Outside interfaces:

FastEthernet4

Inside interfaces:

Vlan1

Hits: 105542 Misses: 2014

CEF Translated packets: 103847, CEF Punted packets: 7340

Expired translations: 3545

Dynamic mappings:

-- Inside Source

[Id: 1] access-list 1 interface FastEthernet4 refcount 107

Queued Packets: 0

Edit:

1. Just now I've tried turning off my modem for 2 mins. It released my PC2s mac and learned my 871W real mac as I wanted it to - It gave me no web access.

2. Turned off my modem for 2 mins. It released my 871W MAC and learned PC1s MAC which I've plugged in directly to the modem - I've accessed the web with my PC1 MAC!

3. I've changed my 871w FE4 MAC back to the way it was before (Assigned PC2s MAC). Changed my PC2s mac to some other MAC and I don't have any problems with losing connection to my router every 10 mins and able to access the web.

So, I'm wondering now, why it doesn't work with my router's MAC while it works with any PC for example when directly connected to the modem after clearing previous learend mac by the modem...

Bilal Nawaz · ‎05-11-2013

Hello David, some good troubleshooting tests there. I'm interested in no.1
How were you able to tell that the MAC address was learnt properly by the Motorola? Do you get any IP address on the router at this stage?

Do you mind showing us a screenshot of this. Also kindly request you show us the output of 'show run int fa4' and 'show int fa4'
So we're at a stage where if we use some other MAC address, it works, but if we use our own, it does not!

I do not think its a problem with NAT, you've configured this correctly.

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David Belmont · ‎05-12-2013

Hi Bilal,

I simply go to my Motorola's address http://192.168.100.1/ and on the picture below you can tell by looking at CPE MAC address which MAC it uses for web access. In this case it's my PC2s MAC. So, every time when I do this procedure I look at CPE MAC to make sure it has changed.

Point38#show running-config interface fa4

Building configuration...

Current configuration : 164 bytes

!

interface FastEthernet4

mac-address 0001.4af9.8b83

ip address dhcp client-id FastEthernet4

ip nat outside

ip virtual-reassembly

duplex auto

speed auto

end

Point38#show int fa4

FastEthernet4 is up, line protocol is up

Hardware is PQUICC_FEC, address is 0001.4af9.8b83 (bia 001f.ca6b.d8c8)

Internet address is 76.114.54.255/21

MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Full-duplex, 100Mb/s, 100BaseTX/FX

ARP type: ARPA, ARP Timeout 04:00:00

Last input 00:00:00, output 00:00:00, output hang never

Last clearing of "show interface" counters never

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 284000 bits/sec, 59 packets/sec

5 minute output rate 101000 bits/sec, 55 packets/sec

32570 packets input, 19466826 bytes

Received 4457 broadcasts, 0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

0 watchdog

0 input packets with dribble condition detected

32113 packets output, 6376725 bytes, 0 underruns

0 output errors, 0 collisions, 3 interface resets

0 babbles, 0 late collision, 0 deferred

0 lost carrier, 0 no carrier

0 output buffer failures, 0 output buffers swapped out

Learning some new commands here, like the first one!

So, why my Motorola doesn't want to give me the web access when using my 871w MAC stays a mystery.

Please help to configure 871W Router for internet connection!