10 Replies Latest reply on Feb 14, 2017 9:54 AM by jayh

    3448 VLAN Routing

    ya5e New Member
    ya5e Feb 11, 2017 4:12 PM

      Hi All

       

      I must be missing something stupid - the 3448 is layer 3 light - when VLANS have IP's they are routable. In other words a device in vlan 10 should be able to ping a device in vlan 1. In short I am not able to ping devices within different vlans. When troubleshooting from the 3448 i can ping the devices just fine. Computer A in vlan 10 cannot ping computer B in vlan 1 and vice versa.

       

      Note: eth0 the ISP uplink is not configured yet so there is no default route.

       

      What am I missing?

       

      Thanks

      • 1526 Views
      • Categories: Firewall, Routing
      • Tags:
        • Re: 3448 VLAN Routing
          ya5e New Member
          ya5e Feb 11, 2017 7:27 PM (in response to ya5e)

          What am I missing?

           

          VLAN 10 - 10.0.10.1

          VLAN 1 - 10.0.0.1

           

          ClientA - 10.0.0.2

          ClientB - 10.0.10.11

           

          DHCP Scopes for both the 10.0.0.0/24 and the 10.0.10.0/24 networks.

           

          When on 3448 I can ping all devices

           

           

           

          When on network 10.0.10.0/24 with port set to VLAN 10 (or trunk port with native 10) I'm not able to ping the client at 10.0.0.2. I can ping the other gateways such as 10.0.10.1 and 10.0.0.1

           

          Wjhen on network 10.0.0.0/24 with port set to VLAN 1 (or trunk port with native 1) Im not  able ot ping the client at 10.0.10.11 I can ping all other gateways such as 10.0.0.1, and 10.0.10.1

          • Re: 3448 VLAN Routing
            jayh Hall_of_Fame
            jayh Feb 12, 2017 11:43 AM (in response to ya5e)

            Because your DHCP scopes are local, remove the helper addresses from the VLAN interfaces.

             

            It may be just cosmetic, but your description of the DHCP pool for 10.0.0.0 says /29 and both the scope and interface are configured for /24.

             

            You should also allow subnets in the Private policy class to reach other subnets within the Private class.

             

            ip access-list extended allow-private

              permit ip any 10.0.0.0 0.255.255.255

             

            ip policy-class Private

              allow list self self

              allow list allow-private policy Private

              nat source list wizard-ics interface eth 0/1 overload

            !

              • Re: 3448 VLAN Routing
                ya5e New Member
                ya5e Feb 12, 2017 3:02 PM (in response to jayh)

                Jayh -

                 

                Thank you for replying! I've been banging my head against the wall. I have updated the config with your suggestions with no luck. I am still unable to ping across VLANs.

                 

                To clarify from the 3448 I can ping all the clients within any subnet.

                 

                From the 10.0.0.0/24 network I am unable to ping clients in the 10.0.10.0/24 network

                From the 10.0.10.0/24 network I am unable to ping clients in the 10.0.0.0/24 network

                 

                Updated Config Here

                 

                Any other ideas?

                 

                Thanks

                  • Re: 3448 VLAN Routing
                    jayh Hall_of_Fame
                    jayh Feb 13, 2017 8:29 AM (in response to ya5e)

                    Your web-acl-6 is wrong. All of your private subnets are within 10.0.0.0/8 so the mask should be /8 or in wildcard form 0.255.255.255. You have it as a /24. or 0.0.0.255.

                     

                    You've made VLAN 1 a /21 but your description still says /29. This is cosmetic assuming that you really want a /21 mask. If you're really going to have in excess of about 500 hosts on a subnet, you may run into some issues with excessive broadcasts.

                      • Re: 3448 VLAN Routing
                        ya5e New Member
                        ya5e Feb 13, 2017 6:15 PM (in response to jayh)

                        Hi Jayh -

                         

                        This makes sense - I have adjusted the config - thank you very much.

                         

                        Everything appears to be working aside from a single host on the 10.0.0.0 network. An access point 10.0.0.2 is only reachable from the 10.0.0.0 network. Granted the AP does pass DHCP for each VLAN from the NV3448. In other words clients get IP's and are placed in the correct VLAN. For some reason the management ip 10.0.0.2 is not reachable from other networks such as 10.0.10.0 however the clients on the AP are.

                         

                        Thanks again for the help!