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Network Layer Troubleshooting
- Mismatched Maximum Transmission Unit (MTU)
- If a router with a higher MTU sends a packet to a router with a lower MTU, the receiving router will attempt top fragment the Packet
- If the packets “Don't Fragment bit is set, the Router will drop the packet and send a ICMP message about the reason
- If the router has been configured not to send out ICMP messages for dropped packets, you have a Black Hole Router Situation