InterVlan noob problem help

[WIZARD1325]

PC1-192.168.10.2

PC2- 192.168.10.3

under Vlan 10

PC3-192.168.20.3

PC4. 192.168.20.4

under Vlan 20

Router default gateway

192.168.10.1. for vlan 10

192.168.20.1 for vlan 20

I can ping 1 and 2 and 2 and 4 in the same Vlan but I cant ping across from vlan 1 to vlan 2  see attachments how i have it set up

I did input the default gateway info under ipconfig on each pc

What am i doing wrong?

thanks in advance

[Deepak Kumar]

Hi, 

I can see that you have connected L2 switch to system and L2 switches are connected to router. So your system default gateway must be your router interface IP. 

If you configured already default gateway as router interface IP then please share router routing or check for any ACL configuration. 

Why we need router interface IP as default gateway on your system?

Because your switch is L2 and could not perform inter vlan routing. 

Regards,

Deepak Kumar

[Mark Malone]

Hi
what way is this setup is it router on a stick design , with sub interfaces on the router or an actual trunk with vlan interfaces on the router , can you provide the config to see whats been setup , is ip routing enabled on the router it should be by default to allow intervlan communication

rns design guide
http://www.firewall.cx/cisco-technical-knowledgebase/cisco-routers/336-cisco-router-8021q-router-stick.html

[WIZARD1325]

whow whoowww whooowwwww fancy talking.....im just a noob here.

im just reading and following what the book tells me to do.

it said L2 switches cant do it so therefore i use a router to do it.

i inputed the numbers above made the vlans and such

but still cant ping from 1 vlan to another

I dont know what a stick design means or is I am just on chapter 2 here.

or sub interface what?  only sub i know is sub netting lol.

[Mark Malone]

Ok i dont know what book your reading off or what configuration is in place , if this is just a lab setup please provide the running config off the devices so we can see if there is something missing

Thats correct L2 device cant do it as its a l3 function but the router either needs to be in trunk mode or using sub interfaces for the design you provided by screenshot to work , thats why i provided a link to show you exactly what a router on stick design is

[WIZARD1325]

I am drawing a blank.  Says nothing about trunking here in the book

its an excercise  about connecting 3 ways

1. physical router

2. subinterfaces

3. switched virtual interfaces

right now im working on lab 1.

i did everything right but there is a section in the paragraph that talks about

vlan 10 has a subnet of 192.168.10.0

i dont remember putting in any subnets just ip address on the router and computers. could this be the missing link? 

[Mark Malone]

the sub interface is the trunk on the router , thats where the vlan tag gets inserted in config , so you would have as an example like belwo on the router

interface g0/0
no ip address
interface g0/0.10
encapsulation dot1q 10
ip address 192.168.10.254 255.255.255.0

Then on the switch uplink to the router
int g0/0
switchport mode trunk

whatr your doing there is whats described in the link i provided , it explains the subinterfaces and how it works when connected to a layer 2 switch

Im not sure what book your working off but without seeing what you have done in terms of configuration its difficult to assist

[WIZARD1325]

ok I attached the LAB

to this post  hopefully that clears any confusion.

pretty straight forward

[WIZARD1325]

the second page

[WIZARD1325]

ok so I am also noticing that I cant ping the router ether

hmmmmm.......but i can ping the computer in the vlan.....hmmmmm

[Jon Marshall]

You are not using a trunk, you are using a separate physical interface for each vlan on the router. 

So using vlan 10 as example, allocate ports for PCs and the port connecting to router into vlan 10 and assign IPs to PCs and an IP to router interface from vlan 10 subnet. 

The default gateway for the PCs in vlan 10 will be the IP assigned to the router interface.

Jon

[WIZARD1325]

i did that and it didnt work

1. I cant ping the router

2. I cant ping Vlan 10 to Vlan 20

3. none can ping router

I. I can ping inside vlan 10  and between vlan 20

[Jon Marshall]

Sorry you were obviously still typing. 

Post switch and router configs plus - 

“show vlan brief” 

from the switch. 

Jon

[WIZARD1325]

ok so i figured it out.  The wire from the router to the switch

needed to be trunked. I have been trunk the host to the switch LOL.

man why dont books just say that urghhhh  3 days to figure that crap out

[WIZARD1325]

thanks for everybodys help..

now gotta practice this to memory