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Cable modem to Cisco 1921 Not working...

brianbaek29
Level 1
Level 1

‎05-07-2015 01:00 AM - last edited on ‎03-25-2019 03:44 PM by Community Manager

Hello world,

 

I am trying to configure my Cisco 1921 Router at home with my cable modem connection using DHCP. I am using a Arris SB6183 DOCSIS 3.0 on Time Warner Cable in Los Angeles.

 

I've been trying to get this to work for the last couple of hours but no success so I'm desperate for help.

 

I can ping inside. Still can't ping out. sh ip int brief shows outside int UP and UP

 

Any help would be greatly appreciated... If you have any questions, please ask me!

 

Here's my sh run below

 

 


Dubai#sh run
Building configuration...

Current configuration : 1442 bytes
!
version 15.1
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname Dubai
!
boot-start-marker
boot-end-marker
!
enable secret 5 $1$Podj$ytuWiSAK.mX69fQPRqUno1
!
no aaa new-model
!
no ipv6 cef
ip source-route
ip cef
!
!
ip dhcp excluded-address 192.168.10.201
ip dhcp excluded-address 192.168.10.202
ip dhcp excluded-address 192.168.10.203
ip dhcp excluded-address 192.168.10.204
ip dhcp excluded-address 192.168.10.205
!
ip dhcp pool home
   network 192.168.10.0 255.255.255.0
   default-router 192.168.10.1
   lease 3
!
!
multilink bundle-name authenticated
!
!
!
license udi pid CISCO1921/K9 sn **
!
!
!
!
!
!
!
!
interface GigabitEthernet0/0
 ip dhcp client update dns
 ip address dhcp
 ip nat outside
 ip virtual-reassembly
 duplex auto
 speed auto
 no cdp enable
!
interface GigabitEthernet0/1
 ip address 192.168.10.1 255.255.255.0
 ip nat inside
 ip virtual-reassembly
 duplex auto
 speed auto
!
ip forward-protocol nd
!
no ip http server
no ip http secure-server
!
ip nat inside source list 1 interface GigabitEthernet0/0 overload
ip nat inside source list 199 interface GigabitEthernet0/0 overload
ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/0
!
access-list 1 permit any
!
!
!
control-plane
!
!
line con 0
 logging synchronous
line aux 0
line vty 0 4
 password *****
 logging synchronous
 login
 transport input telnet ssh
!
scheduler allocate 20000 1000
end

 

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0 Helpful
4 Replies 4

vivek srivastava
Level 7
Level 7

‎05-07-2015 03:35 AM

pls provide outputs of below:

# sh ip int brie

# ping 4.2.2.2 sour gi0/0

0 Helpful

brianbaek29
Level 1
Level 1
In response to vivek srivastava

‎05-07-2015 07:37 AM

Hello,

 

I believe it's working now...

 

removing the default route fixed the issue?

 

0 Helpful

rosaho
Level 3
Level 3
In response to brianbaek29

‎07-23-2015 01:04 PM

This discussion has been reposted from Cisco On Demand to the WAN, Routing and Switching community.

0 Helpful

brianbaek29
Level 1
Level 1
In response to vivek srivastava

‎05-07-2015 07:56 AM

Here is my new config.

 

sh ip int brief

 

Dubai#sh ip int brief
Interface                  IP-Address      OK? Method Status                Protocol
GigabitEthernet0/0         1*.*.*.*   YES DHCP   up                    up
GigabitEthernet0/1         192.168.10.1    YES NVRAM  up                    up
NVI0                       unassigned      YES unset  administratively down down

 

 

ping 4.2.2.2 source g0/0

 

Dubai#ping 8.8.4.4 source g0/0

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 8.8.4.4, timeout is 2 seconds:
Packet sent with a source address of 1.*.*.*
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/9/12 ms

 

I've removed ip route 0.0.0.0 0.0.0.0 g0/0

and I noticed I was able to ping outside with the source of my outside int

and I hard coded the dns-servers

 

 

 

Here is my sh run

 

Building configuration...

Current configuration : 1440 bytes
!
! Last configuration change at 08:49:58 UTC Thu May 7 2015
!
version 15.1
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname Dubai
!
boot-start-marker
boot-end-marker
!
enable secret 5 $1$Podj$ytuWiSAK.mX69fQPRqUno1
!
no aaa new-model
!
no ipv6 cef
ip source-route
ip cef
!
!
ip dhcp excluded-address 192.168.10.201
ip dhcp excluded-address 192.168.10.202
ip dhcp excluded-address 192.168.10.203
ip dhcp excluded-address 192.168.10.204
ip dhcp excluded-address 192.168.10.205
!
ip dhcp pool home
   network 192.168.10.0 255.255.255.0
   default-router 192.168.10.1
   dns-server 209.18.47.61 209.18.47.62 8.8.4.4
   lease 3
!
!
multilink bundle-name authenticated
!
!
!
license udi pid CISCO1921/K9 sn *********
!
!
!
!
!
!
!
!
interface GigabitEthernet0/0
 ip dhcp client update dns
 ip address dhcp
 ip nat outside
 ip virtual-reassembly
 duplex auto
 speed auto
 no cdp enable
!
interface GigabitEthernet0/1
 ip address 192.168.10.1 255.255.255.0
 ip nat inside
 ip virtual-reassembly
 duplex auto
 speed auto
!
ip forward-protocol nd
!
no ip http server
no ip http secure-server
!
ip nat inside source list 1 interface GigabitEthernet0/0 overload
!
access-list 1 permit any
!
!
!
control-plane
!
!
line con 0
 logging synchronous
line aux 0
line vty 0 4
 password *****
 logging synchronous
 login
 transport input telnet ssh
!
scheduler allocate 20000 1000
end

0 Helpful
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