Beginner Routing Question (Router on a stick / Inter VLAN routing)

[gregor.wolter]

Hello Community,

I hope this is the right category :)

Right now I am building a network for a project and for some reason my DHCP server does not work.

For a quick overview:

I have:
1x client (who should recieve a ip address)
1x Layer 3 switch
1x router
1x DHCP server

This setup is required, because the actual topologie is quite big and for training purposes.

So:

The client and the server are in different VLANs
The subinterfaces on the router are set up, got the ip addresses, the helper-address and the encapsulations
The DHCP-server has an ip-pool

When the request is sent it reaches the server over the gateway and the server sents the answer. Every packet sent from there on gets stuck on the router.

My .pkt file is attached.

Right now I have a Catalyst 3350 Switch and a 1700 router available.

Thanks in advance for the help,
Gregor

[Georg Pauwen · Accepted solution]

Hello,

the problem is simply that the default gateway of your DHCP server is set to 172.16.30.2. It should be 172.16.30.1. Also, your DHCP pool has 172.16.30.1 as default gateway, while that should be 172.16.20.1.

If you change that, it should work.

[gregor.wolter]

Thats for the tip. What a stupid mistake, and yes that works.
For some reason the actual build just worked as well after reading that messenge without doing anything...
So I highly appreciate the help.

[Georg Pauwen]

Gregor,

keep in mind that Packet Tracer is not really working with full IOS images, it is a very useful simulator, but with a limited command set. You might want to have a look at GNS3, it is free and uses valid IOS images. Great for testing purposes !

https://www.gns3.com/