rscapp
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Need help with Cisco 1751 router and Cable Modem setup, cant access internet
I need some help with my home network setup. I have a Cisco 1751 router and 2950 switch. My internet is provided by Timewarner cable. Below is the setup:
The cable modem is directly connected to the 1751 WIC 1ENET card and has been assigned a dhcp addr of 10.114.184.83 from the cable modem. My 2950 is directly connected to the 1751 Fast Ethernet port (fa0/0) with a static ip of 192.168.100.3. My workstation is connected to the 2950 switch, with an ip of 192.168.100.6 and default gateway of 192.168.100.3 and I can ping both 192.168.100.3 and 10.114.184.83 interfaces, but I cant access the internet.
Whats weird is from the 10.114.184.83 interface I can ping www.timewarnersandieogo.com but thats it. The running config is below:
Building configuration...
Current configuration : 864 bytes
!
version 12.2
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname rscapp_1751
!
enable password firewall
!
memory-size iomem 20
mmi polling-interval 60
no mmi auto-configure
no mmi pvc
mmi snmp-timeout 180
ip subnet-zero
!
!
ip name-server 66.75.164.90
ip name-server 66.75.164.89
ip name-server 67.102.133.222
!
!
!
!
interface Ethernet0/0
ip address dhcp
ip nat outside
full-duplex
!
interface FastEthernet0/0
ip address 192.168.100.3 255.255.255.0
ip nat inside
speed auto
!
router rip
version 2
network 10.0.0.0
network 192.168.100.0
!
ip nat inside source list 102 interface Ethernet0/0 overload
ip classless
no ip http server
ip pim bidir-enable
!
access-list 102 permit ip 192.168.100.0 0.0.0.255 any
!
!
line con 0
line aux 0
line vty 0 4
Could this be a DNS issue on the workstation. I am using a public DNS server in the TCP\IP properties and the router IP also. I have a DNS server in my network but I dont know if its working correctly.
If any additional information is needed please let me know.
thanks
The cable modem is directly connected to the 1751 WIC 1ENET card and has been assigned a dhcp addr of 10.114.184.83 from the cable modem. My 2950 is directly connected to the 1751 Fast Ethernet port (fa0/0) with a static ip of 192.168.100.3. My workstation is connected to the 2950 switch, with an ip of 192.168.100.6 and default gateway of 192.168.100.3 and I can ping both 192.168.100.3 and 10.114.184.83 interfaces, but I cant access the internet.
Whats weird is from the 10.114.184.83 interface I can ping www.timewarnersandieogo.com but thats it. The running config is below:
Building configuration...
Current configuration : 864 bytes
!
version 12.2
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname rscapp_1751
!
enable password firewall
!
memory-size iomem 20
mmi polling-interval 60
no mmi auto-configure
no mmi pvc
mmi snmp-timeout 180
ip subnet-zero
!
!
ip name-server 66.75.164.90
ip name-server 66.75.164.89
ip name-server 67.102.133.222
!
!
!
!
interface Ethernet0/0
ip address dhcp
ip nat outside
full-duplex
!
interface FastEthernet0/0
ip address 192.168.100.3 255.255.255.0
ip nat inside
speed auto
!
router rip
version 2
network 10.0.0.0
network 192.168.100.0
!
ip nat inside source list 102 interface Ethernet0/0 overload
ip classless
no ip http server
ip pim bidir-enable
!
access-list 102 permit ip 192.168.100.0 0.0.0.255 any
!
!
line con 0
line aux 0
line vty 0 4
Could this be a DNS issue on the workstation. I am using a public DNS server in the TCP\IP properties and the router IP also. I have a DNS server in my network but I dont know if its working correctly.
If any additional information is needed please let me know.
thanks
Need to add a gateway of last resort. I think, let me check I have never done it with my public interface set to DHCP.
No, need a default route.
On the router -> ip route 0.0.0.0 0.0.0.0 <ip.other.end.of cable.connection>
Your ISP should either be providing a default route (check with "show ip route") or ask them what it is so that you can manually configure it.
On the router -> ip route 0.0.0.0 0.0.0.0 <ip.other.end.of cable.connection>
Your ISP should either be providing a default route (check with "show ip route") or ask them what it is so that you can manually configure it.
bhnmi is correct in that you need a gateway of last resort but using dhcp you will have to set it to an interface.
Ip route 0.0.0.0 0.0.0.0 e0/0
Jesper, your comment is setting a gateway of last resort.
Hope this helps
B
Ip route 0.0.0.0 0.0.0.0 e0/0
Jesper, your comment is setting a gateway of last resort.
Hope this helps
B
I've had to help too many people that use the incorrect statement. The correct statement is "default route".
ip default-gateway <ip.address>
is different from
ip route 0.0.0.0 0.0.0.0 <ip.address>
ip default-gateway <ip.address>
is different from
ip route 0.0.0.0 0.0.0.0 <ip.address>
ASKER
Sorry, but I am still confused. See the output below. It appears the cable modem ip is 10.113.160.1 which I set as the Gateway of last resort. However I see E0/0 directly connected to 10.113.160.0, so is that the IP I should be using. With this current config, I can ping www.timewarnersandiego.com, but not www.cnn.com. I still cant get out to the internet from the workstation.
rscapp_1751#sh ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter ar
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is 10.113.160.1 to network 0.0.0.0
10.0.0.0/19 is subnetted, 1 subnets
C 10.113.160.0 is directly connected, Ethernet0/0
C 192.168.100.0/24 is directly connected, FastEthernet0/0
S* 0.0.0.0/0 [254/0] via 10.113.160.1
rscapp_1751#sh arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 192.168.100.6 2 001a.9292.7d93 ARPA FastEthernet0/0
Internet 192.168.100.3 - 0009.435f.c2ab ARPA FastEthernet0/0
Internet 10.113.172.15 - 0004.dc0c.b539 ARPA Ethernet0/0
Internet 10.113.160.1 2 0030.b8c9.65b0 ARPA Ethernet0/0
rscapp_1751#ping www.timewarnersandiego.com
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 24.94.1.12, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/11/12 ms
rscapp_1751#ping www.cnn.com
Translating "www.cnn.com"...domain server (66.75.164.90) [OK]
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 64.236.91.24, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
rscapp_1751#ping 64.236.91.24
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 64.236.91.24, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
rscapp_1751#sh ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter ar
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is 10.113.160.1 to network 0.0.0.0
10.0.0.0/19 is subnetted, 1 subnets
C 10.113.160.0 is directly connected, Ethernet0/0
C 192.168.100.0/24 is directly connected, FastEthernet0/0
S* 0.0.0.0/0 [254/0] via 10.113.160.1
rscapp_1751#sh arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 192.168.100.6 2 001a.9292.7d93 ARPA FastEthernet0/0
Internet 192.168.100.3 - 0009.435f.c2ab ARPA FastEthernet0/0
Internet 10.113.172.15 - 0004.dc0c.b539 ARPA Ethernet0/0
Internet 10.113.160.1 2 0030.b8c9.65b0 ARPA Ethernet0/0
rscapp_1751#ping www.timewarnersandiego.com
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 24.94.1.12, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/11/12 ms
rscapp_1751#ping www.cnn.com
Translating "www.cnn.com"...domain server (66.75.164.90) [OK]
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 64.236.91.24, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
rscapp_1751#ping 64.236.91.24
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 64.236.91.24, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
That means nothing :) That IP does not allow ICMP.
ASKER
So do you see anything wrong in my running config? I still cant get a any website, even timewarnersandiego.com. Could it be something with DNS? At this point I have no idea what to do next.
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ASKER
great, thanks for your help. I had the wrong default gateway. I did a direct connect to the cable modem, then took the IP and assigned it to e0/0, then added the ip route command, unpluged the cable modem, waited 30sec pluged back in and connected the router, now i have internet. thanks again.