Default Route cannot ping

Answered Question
Aug 10th, 2010
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Hi everybody. I have this scenario,


A 3500 cisco switch and 2900 cisco swtich. I have 3 Vlan in the 3500 and 2900 swithces, Vlan10, 20 and 30. In the 3500 also I have DHCP Server for the Vlan20 and 30, I get a valid IP address and I can ping between Vlan's. I have a Router connected to the Internet and the 3500 Switch.


On the 3500 I configured an Interface for route traffic to the Internet through the Router.


3500(config)# interface fastethernet 0/1

3500(config-if)# no switchport

3500(config-if)# ip address 10.0.10.2 255.255.255.0

3500(config-if)# no shutdown

3500(config-if)# exit

3500(cofnig)# ip route 0.0.0.0 0.0.0.0 10.0.10.1

3500(config)# exit

3500# show ip route


10.0.0.0/24 is subnetted, 3 subnets

C       10.0.10.0 is directly connected, Interface FastEthernet 0/1
C       10.0.20.0 is directly connected, Vlan20
C       10.0.30.0 is directly connected, Vlan30

S*      0.0.0.0/0 [1/0] via 10.0.10.1


3500# ping 10.0.10.1


Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.0.10.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/4 ms


The Problem:


From any PC that I try to ping the default gateway for the Internet 10.0.10.1 and Fail. Also I try to browse a web page do not work.


PC Vlan20:


IPv4 address: 10.0.20.10

Subnet Mask: 255.255.255.0

Default Gateway: 10.0.20.1         (3500 Vlan Interface)

DNS Server: 10.0.10.3


I can ping from a PC in the VLan20 to PC in the Vlan30, I can ping from PC in the VLan 20 to all Vlan Interface on the 3500 Switch. I can ping from the 3500 Switch to PC Vlan20 and 30, I can ping from 3500 Switch to Router 10.0.10.1 and DNS server 10.0.10.3. But I can NO ping from VLAN PC to Router 10.0.10.1 and the DNS Server 10.0.10.3 and also I can no browse any web page on the Internet.


Thank you for all.

Correct Answer by Jon Marshall about 6 years 7 months ago

You need to add routes for your 3550 vlans onto the router eg.


ip route 10.0.20.0 255.255.255.0 10.0.10.2

ip route 10.0.30.0 255.255.255.0 10.0.10.2


Jon

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Correct Answer
Jon Marshall Tue, 08/10/2010 - 09:44
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You need to add routes for your 3550 vlans onto the router eg.


ip route 10.0.20.0 255.255.255.0 10.0.10.2

ip route 10.0.30.0 255.255.255.0 10.0.10.2


Jon

Jerry Ye Tue, 08/10/2010 - 09:46
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Does your router has routes point back to 10.10.10.2 for 10.10.20.0/24 (VLAN20) and 10.10.30.0/24 (VLAN30)?


Regards,

jerry

goransh_pc Tue, 08/10/2010 - 09:56
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I don't Have any route on my Router, so I think that these are the Problems such as you said guys I have to add a route in my Router for this Vlans.
I will configure these route and try ping again.
Thank you Jon Marshal and Jeye for all your Help.

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