Muftasoft TM

Let's dive into troubleshooting VLAN and Inter-VLAN Routing issues in your simulated network environment. Here are some steps to follow:

1. Check VLAN Configuration:

1. Verify that the VLANs are correctly configured on the switch (S1). Ensure that the VLAN IDs match across the switch and router (R1).
2. Use the following commands on S1 to check VLAN information:

```

      S1# show vlan brief
      ```

2. Verify VLAN Assignments:

1. Confirm that the correct VLANs are assigned to the switch ports (F0/6 and F0/11) where PC1 and PC3 are connected.
2. Use the following command on S1 to check port VLAN assignments:

```

      S1# show interfaces status
      ```

3. Check Trunk Configuration:

1. Ensure that the link between S1 and R1 is configured as a trunk port with 802.1Q encapsulation.
2. Verify that the subinterfaces on R1 (G0/0.10 and G0/0.30) are correctly associated with the VLANs.
3. Use the following command on R1 to check trunk configuration:

```

      R1# show interfaces trunk
      ```

4. Verify IP Addresses:

1. Confirm that the IP addresses assigned to the subinterfaces on R1 are correct.
2. Use the following command on R1 to check IP addresses:

```

      R1# show ip interface brief
      ```

5. Ping Tests:

1. Perform ping tests from PC1 to PC3 and vice versa. Ensure that both PCs can reach each other.
2. If pings fail, check the following:
   1. IP address configuration on PCs.
   2. Default gateways set on PCs (should point to the subinterface IP address on R1).
   3. Any access control lists (ACLs) or firewall rules blocking traffic.

6. Debugging:

1. Enable debugging on R1 to capture any routing-related issues:

```

      R1# debug ip packet
      ```

7. Check Routing Table:

1. Verify that R1 has routes for both VLAN subnets (10 and 30).
2. Use the following command on R1:

```

      R1# show ip route
      ```

8. Check Physical Connectivity:

1. Physically inspect the cables and connections between devices. Ensure they are securely connected.
2. Look for any link or port errors on the switch and router interfaces.

9. Review ACLs and Security Policies:

1. If you have any access control lists (ACLs) or security policies, ensure they allow traffic between VLANs.

10. Packet Captures:

1. Use packet capture tools (such as Wireshark) to analyze network traffic between PC1 and PC3. Look for any anomalies.

Remember to document your troubleshooting steps and any changes you make. If you encounter specific issues or error messages, feel free to share them, and we can troubleshoot further. 🛠️🔍