Disadvantages of sending ICMP error packets
Sending ICMP error packets facilitates network control and management, but it has the following disadvantages:
Increases network traffic.
A device's performance degrades if it receives a lot of malicious packets that cause it to respond with ICMP error packets.
A host's performance degrades if the redirection function increases the size of its routing table.
End users are affected because of receiving ICMP destination unreachable packets caused by malicious users.
To prevent such problems, disable the device from sending ICMP error packets.