Default Route cannot ping

Answered Question
Aug 10th, 2010
User Badges:

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

3500(config-if)# no shutdown

3500(config-if)# exit

3500(cofnig)# ip route

3500(config)# exit

3500# show ip route is subnetted, 3 subnets

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

S* [1/0] via

3500# ping

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to, 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 and Fail. Also I try to browse a web page do not work.

PC Vlan20:

IPv4 address:

Subnet Mask:

Default Gateway:         (3500 Vlan Interface)

DNS Server:

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 and DNS server But I can NO ping from VLAN PC to Router and the DNS Server 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

ip route


  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 5 (2 ratings)
Correct Answer
Jon Marshall Tue, 08/10/2010 - 09:44
User Badges:
  • Super Blue, 32500 points or more
  • Hall of Fame,

    Founding Member

  • Cisco Designated VIP,

    2017 LAN, WAN

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

ip route

ip route


Jerry Ye Tue, 08/10/2010 - 09:46
User Badges:
  • Cisco Employee,

Does your router has routes point back to for (VLAN20) and (VLAN30)?



goransh_pc Tue, 08/10/2010 - 09:56
User Badges:
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.


This Discussion