How to configure Inter-VLAN Routing: Router-On-A-Stick

[mitsuyukiwashida]

Dear All,

This is my first time here and I would like an advice/help on this little project I created. I am studying for the CCENT (via a course on udemy.com), and I created this project to practice some commands, but this project I made in Packet Tracer is also something I am doing for fun as well. Right now, I am configuring Router-On-A-Stick for Inter-VLAN routing. I configured my network devices, but when I try to ping from PC6 from VLAN 30 to PC9 in VLAN40, it doesn't ping.

I made sure to check my setting and it looks to be right, but maybe there is something I am missing that I may not be noticing. Could anyone please take a look at my network project? I attach a zipped folder that contains file and some text files for the involved devices.

[Pawan Raut · Accepted solution]

Unfortunately, I am not able to open your topology but from router and switch configuration I could see you are duplicating the IP address of vlan 30 and 40 on router and SW3. You should first make sure where you want to have Layer 3 gateway on router or switch3 and assigned a unique IP address to each. Make sure your PC has that Layer3 VLAN as the gateway and your pc can ping that gateway.

[mitsuyukiwashida]

Hello Pawan,

So I changed the IP address where a duplicate address was occurring and now it is working. I confirmed that the PCs for both VLAN 30 and VLAN 40 can ping each other, and that they can ping the default gateway on the R1.

Also, I completed my goal of creating a DHCP/DNS server to assign IP address to the VLAN 30 and 40's PCs while still able to ping each other.

[Georg Pauwen]

Hello,

the problem was likely that you needed crossover cables between the switches. I have replaced the cables, and also removed all Vlan interfaces from the layer 2 switches, as these are not needed.

Check the revised, working project file...(you need PT version 7.3.0).

[mitsuyukiwashida]

I look into the revised project. Thank you for taking your time to make a correction, but however, now the PC members within VLAN cannot ping each other.

VLANs are actually needed to be created on every involved switches in the network. The solution was that I needed to assign an unique IP address whenever it is necessary.