Simple routing using a Cisco 871

Posted on 2009-05-13
Last Modified: 2012-05-06
I have just got a Cisco 871 which I am configuring through "Cisco Configuration Professional" and IOS commands where needed, both of which I am familiar enough with the use of.

I am trying to set up a simple route configuration between two laptops with the router in-between, however I cannot get the router to route!  Using ping, no response.

Here's the set up:

Laptop 1 - IP:  Subnet Mask: Default Gateway:

Router WAN interface - IP:  Subnet Mask:

Router VLAN Interface (Switched Port 3) - IP:  Subnet Mask:

Laptop 2 - IP:  Subnet Mask: Default Gateway:

All other settings are factory default.  I've tried setting up various static routes but they don't seem to help.  As I said, I'm new to Cisco, any help would be appreciated.  

Many thanks,
Question by:DownsIT
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LVL 43

Expert Comment

ID: 24375298
Try this:

conf t
ip routing

Can each PC ping its gateway?

If still not working, can you post a "show run" from the rotuer?

Author Comment

ID: 24375436
Each PC can ping it's Gateway and other sides gateway, ie Laptop 1 can ping both and, but not the other laptop.

Just a note, there are no other hardware or software firewalls active between the laptops.

The conf t and ip routing didn't help.

Show Run output attached in txt format.
LVL 43

Accepted Solution

JFrederick29 earned 500 total points
ID: 24375484
Give this a shot:

interface FastEthernet4
no zone-member security Downs
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Author Comment

ID: 24375514
Yep, that worked.  Could you quickly explain why it worked though, thanks.
LVL 43

Expert Comment

ID: 24375538
Yeah, you have the Zone Based Firewall enabled on the WAN interface with no policy defined which means it will block all traffic to and from that interface.  Once you have a policy defined, you can enable the Firewall if desired.

Author Comment

ID: 24375579
Excellent, understood.  Many thanks for you help.
LVL 43

Expert Comment

ID: 24375676
No prob.

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