Internet - 3550 - Vlans

[Andrewchandler1973]

Hi,

I'm playing with a 3550 switch.

I have created several vlans and can ping between those.

If I go onto the switch I can ping the gateway and the internet.

If I go on to a host connected to one of the vlans and try and ping the internet I get nothing.

The switch is attached to a router with the ip address 192.168.0.1. I've done the no switchport command on the interface and again I can ping anything from the switch I just can't ping from a host through the switch.

What have I done wrong?

Thanks.

3550#show run

Building configuration...

Current configuration : 3707 bytes

!

version 12.1

no service pad

service timestamps debug uptime

service timestamps log uptime

no service password-encryption

!

hostname 3550

!

enable secret 5 $1$YB2k$xsUyU5VDRZiEEaMgew45W0

!

username libby password 0 libby

no ip subnet-zero

ip routing

!

ip dhcp pool wireless

   network 192.168.2.0 255.255.255.0

   default-router 192.168.2.1

   domain-name wireless

   dns-server 8.8.8.8

!

ip dhcp pool vlan3

   network 192.168.3.0 255.255.255.0

   default-router 192.168.3.1

   domain-name accounts

   dns-server 8.8.8.8

!

ip dhcp pool vlan4

   network 192.168.4.0 255.255.255.0

   default-router 192.168.4.1

   dns-server 8.8.8.8

   domain-name marketing

!

ip dhcp pool vlan5

   network 192.168.5.0 255.255.255.0

   default-router 192.168.5.1

   dns-server 8.8.8.8

!

ip domain-name test

!

!

spanning-tree mode rapid-pvst

spanning-tree extend system-id

spanning-tree vlan 1 priority 24576

!

!

!

!

!

interface FastEthernet0/1

switchport mode access

spanning-tree portfast

!

interface FastEthernet0/2

switchport mode access

spanning-tree portfast

!

interface FastEthernet0/3

switchport access vlan 2

switchport mode access

spanning-tree portfast

!

interface FastEthernet0/4

switchport access vlan 2

switchport mode access

spanning-tree portfast

!

interface FastEthernet0/5

switchport access vlan 3

switchport mode access

spanning-tree portfast

!

interface FastEthernet0/6

switchport access vlan 3

switchport mode access

spanning-tree portfast

!

interface FastEthernet0/7

switchport access vlan 4

switchport mode access

spanning-tree portfast

!

interface FastEthernet0/8

switchport access vlan 4

switchport mode access

spanning-tree portfast

!

interface FastEthernet0/9

switchport access vlan 5

switchport mode access

spanning-tree portfast

!

interface FastEthernet0/10

switchport access vlan 5

switchport mode access

spanning-tree portfast

!

interface FastEthernet0/11

switchport mode dynamic desirable

spanning-tree portfast

!

interface FastEthernet0/12

switchport mode dynamic desirable

spanning-tree portfast

!

interface FastEthernet0/13

switchport mode dynamic desirable

spanning-tree portfast

!

interface FastEthernet0/14

switchport mode dynamic desirable

spanning-tree portfast

!

interface FastEthernet0/15

switchport mode dynamic desirable

spanning-tree portfast

!        

interface FastEthernet0/16

switchport mode dynamic desirable

spanning-tree portfast

!

interface FastEthernet0/17

switchport mode dynamic desirable

spanning-tree portfast

!

interface FastEthernet0/18

switchport mode dynamic desirable

spanning-tree portfast

!

interface FastEthernet0/19

switchport mode dynamic desirable

spanning-tree portfast

!

interface FastEthernet0/20

switchport mode dynamic desirable

spanning-tree portfast

!

interface FastEthernet0/21

switchport mode dynamic desirable

spanning-tree portfast

!

interface FastEthernet0/22

switchport mode dynamic desirable

bandwidth 10

spanning-tree portfast

!

interface FastEthernet0/23

switchport access vlan 6

switchport mode access

spanning-tree portfast

!

interface FastEthernet0/24

no switchport

ip address 192.168.0.2 255.255.255.0

spanning-tree portfast

!

interface GigabitEthernet0/1

switchport mode dynamic desirable

!

interface GigabitEthernet0/2

switchport mode dynamic desirable

!

interface Vlan1

ip address 10.0.1.234 255.255.255.0

!

interface Vlan2

ip address 192.168.2.1 255.255.255.0

!

interface Vlan3

ip address 192.168.3.1 255.255.255.0

!

interface Vlan4

ip address 192.168.4.1 255.255.255.0

!

interface Vlan5

ip address 192.168.5.1 255.255.255.0

!

ip classless

ip route 0.0.0.0 0.0.0.0 192.168.0.1

ip http server

[Amit Singh]

Hi Andrew,

What is the Default Gateway on the host? Have you checked that the correct gateway is assigned?

Does you router has reverse static routes towards 3550 switch to reach the subnets configured on the 3550?

Also, Please could you paste " show ip route " from both the 3550 and router.

-amit singh

[Andrewchandler1973]

Thanks for the reply. The default gateway on the host is set by the dhcp as per the show run. The hosts seem to be able to communicate between each other fine, ping the switch etc.

The router is just a home router so can't post the config.

I think you are on to something re the reverse routes. I don't have any! I just plugged the home router into fa0/24, can I not do that?

Will post show ip route etc in a bit.

Thanks

[lgijssel]

Did you set the def gw on the host correctly?

regards,

Leo

[ajay chauhan]

where is you NAT configuration ? post router config as well.

[cadet alain]

Hi,

He can't have a NAT configuration on a 3550  He must be doing the NAT on the router

Regards.

Alain

[ajay chauhan]

Agree i asked for router config only .

where is you NAT configuration ? post router config as well.

[Amit Singh · Accepted solution]

Can you set the static routes on your router? If not, can a routing procotocol be configured on this router? Unless the router knows how to get to these subnets, it wont be able to forward the traffic towards 3550.

The only way you can make it work either

1. Have the static routes on the router for the subnets configured on the 3550 switch?

2. Run a routing protocol between 3550 and the router and include the subnets that you ahve configured on the 3550 under the routing proctocol config.

3. Have a single vlan configred and have all the hosts connected to this vlan only.

Hope this helps.

-amit singh

[Andrewchandler1973]

Thanks very much for your quick reply.

I will take a look at that in a bit.

[Andrewchandler1973]

It was the routes on the other router. I was being a moron and over looked the simply stuff.

Thanks again!

[Amit Singh]

No worries Andrew. Glad it worked. Thank you for using the rating system and marked the post as answered.

Please feel free to post any questions that you have doubts on.

Cheers,

-amit singh