01-30-2014 09:43 PM - edited 03-04-2019 10:13 PM
Hi,
I have recently changed ISP and had to configure my router to accomodate the new ISP. But for some reason I cannot seem to connect to the Internet.
My setup consists of the ISP's modem, my router and then a bunch of switches for the LAN.
With the old ISP, the config was as follows:
Interface FastEthernet 0/0
Description LAN Interface
ip address 192.168.5.1 255.255.255.0
ip nat inside
Interface Serial 0/0/0
Description ISP INTERNET LINK
ip address 10.88.96.212 255.255.255.252
ip nat outside
ip name-server 123.108.252.50
ip name-server 123.108.252.51
ip route 0.0.0.0 0.0.0.0 10.88.96.212
ip nat inside source list 1 interface serial 0/0/0 overload
access-list 1 permit 192.168.0.0 0.0.0.255
access-list 1 permit 192.168.5.0 0.0.0.255
Everything worked fine. With the new ISP, the cable modem they provided has one ethernet port which I connect to one of my FastEthernet ports.
I setup the router for the new ISP like so:
Interface FastEthernet 0/0
Description CRS LAN Interface
ip address 192.168.5.1 255.255.255.0
ip nat inside
Interface FastEthernet 0/1
Description ISP INTERNET LINK
ip address 192.167.18.222 255.255.255.252
ip nat outside
ip name-server 51.202.229.132
ip name-server 51.202.229.130
ip route 0.0.0.0 0.0.0.0 192.167.18.221
ip nat inside source list 1 interface FastEthernet 0/1 overload
access-list 1 permit 192.168.0.0 0.0.0.255
access-list 1 permit 192.168.5.0 0.0.0.255
From my router, I can ping the gateway 192.167.18.221. I can ping all devices in my LAN but I cannot connect to the Internet.
If I connect the ISP modem via ethernet cable directly to my laptop, the Internet works so there seems to be a problem with my config.
Would like some assistance. Thanks in advance
Solved! Go to Solution.
02-01-2014 01:18 AM
Hello
Can you try give the wan interface of the router the mac address of your laptop and try again
Possibly you can only register one MAC address with ISP and this way you are spoofing the ISP into thinking your laptop is attached
Res
Paul
Sent from Cisco Technical Support iPad App
02-01-2014 01:34 AM
How do I give the wan interface the mac address of my laptop ?
02-01-2014 01:53 AM
Hello
Int xxx(ISP link)
mac-address xxxx.xxxx.xxxx
To find MAC address of PC
====================
Start /run
Cmd
Get mac /v
Res
Paul
Sent from Cisco Technical Support iPad App
02-01-2014 02:51 AM
Entering the mac address doesn't help.
The problem still persists
02-01-2014 02:55 AM
Hi David,
Please remove mac-address command from WAN interface and please upload your running-config.
Also you mentioned that you can ping 8.8.8.8 from router. Can you upload ouput of traceroute/tracert 8.8.8.8 from some of your LAN device, thanks.
Best Regards
Please rate all helpful posts and close solved questions
02-01-2014 03:36 AM
tracert
------------
Tracing route to google-public-dns-a.google.com [8.8.8.8]
over a maximum of 30 hops:
1 5 ms 5 ms 5 ms 192.167.18.221
2 5 ms 5 ms 5 ms 41.202.226.93
3 4 ms 5 ms 5 ms 41.202.226.5
4 194 ms 195 ms 196 ms gigabitethernet1-0-3.marcr1.Marseille.opentransi
t.net [193.251.251.197]
5 189 ms 187 ms 199 ms gigabitethernet13-2-1.marcr2.Marseille.opentrans
it.net [193.251.133.209]
6 190 ms 189 ms 188 ms tengige2-15-0-9.pastr1.Paris.opentransit.net [19
3.251.131.217]
7 192 ms 187 ms 187 ms google-10.GW.opentransit.net [193.251.250.44]
8 205 ms 188 ms 189 ms 72.14.239.145
9 186 ms 189 ms 186 ms 209.85.245.70
10 193 ms 197 ms 192 ms 209.85.245.87
11 193 ms 192 ms 192 ms 72.14.238.43
12 * * * Request timed out.
13 193 ms 192 ms 192 ms google-public-dns-a.google.com [8.8.8.8]
Trace complete.
sh run
-----------
Current configuration : 1564 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname CATHOLIC_RELIEF
!
boot-start-marker
boot-end-marker
!
enable secret 5 xxxxxxxxxxxxxxxxxxxx
enable password xxxxxxxxxxxxxxxxxxxx
!
no aaa new-model
!
resource policy
!
mmi polling-interval 60
no mmi auto-configure
no mmi pvc
mmi snmp-timeout 180
ip subnet-zero
ip cef
!
!
no ip dhcp use vrf connected
!
!
ip name-server 51.202.229.132
ip name-server 51.202.229.130
!
username xxxxxxx privilege 15 secret 5 xxxxxxxxxxxxxxx
!
!
!
interface FastEthernet0/0
description CRS LAN Interface
ip address 192.168.5.1 255.255.255.0
ip nat inside
duplex auto
speed auto
!
interface FastEthernet0/1
description ISP Internet Link
ip address 192.167.18.222 255.255.255.252
ip nat outside
duplex auto
speed auto
!
interface Serial0/0/0
description OLD INTERNET LINK
ip address a.b.c.d 255.255.255.252
shutdown
!
interface Serial0/1/0
description redundant
ip address w.x.y.z 255.255.255.252
shutdown
!
interface Serial0/1/1
no ip address
shutdown
clockrate 2000000
!
ip classless
ip route 0.0.0.0 0.0.0.0 192.167.18.221
!
ip http server
ip http authentication local
ip nat inside source list 1 interface FastEthernet0/1 overload
!
access-list 1 permit 192.168.5.0 0.0.0.255
access-list 1 permit 192.168.0.0 0.0.0.255
!
control-plane
!
!
line con 0
password P0ssw0rd
login
line aux 0
line vty 0 4
privilege level 15
password xxxxxxxxxxx
login local
transport input telnet
!
end
02-01-2014 03:50 AM
Hi David,
Config looks good. traceroute output is from your router, right? Can you upload traceroute from PC in your LAN, I think that internet connection works but your DNS config is probably not correct.
Do you use DHCP in your LAN? I dont see any DHCP config on router. Did you staticly configure your LAN PC? Can you upload ipconfig with traceroute output which I asked earlier? thanks
Best Regards
Please rate all helpful posts and close solved questions
02-01-2014 04:09 AM
That tracert I uploaded is from a PC in the LAN
Yes I use DHCP in my LAN. DHCP is setup in windows server.
02-01-2014 04:15 AM
Hi David,
If traceroute output is from LAN PC, I would expect that first hop will be 192.168.5.1, not 192.167.18.221 which is ISP gateway.
Can you please upload these output from LAN PC:
ipconfig /all
route print
ping www.google.com
Also as pdriver suggested to try crosscable, I dont think it will be necessary cause it seems that connectivity is up.
Best Regards
Please rate all helpful posts and close solved questions
02-02-2014 01:52 AM
Yes you are correct. It was the router tracert..
02-01-2014 03:42 AM
Hello
Yes please remove the static mac
And try a crossover cable from router to modem
Res
Paul
Sent from Cisco Technical Support iPad App
02-01-2014 04:10 AM
Don't have a crossover cable here.
Will let you know when I try that
02-01-2014 07:01 AM
Hi,
Its a DNS issue....try to config 4.4.4.4 as ur DNS in your laptop and even in router. it should work.
Regards,
Satya.M
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