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Cisco Employee

What happens if a router

receives a packet larger than the defined MTU size and has the df (don't fragment) bit set to true? Will the router drop the packet?

Thanks

1 REPLY 1
Cisco Employee

Re: What happens if a router

The packet is dropped and an ICMP destination unreachable (type 3) fragmentation needed and don't FDF was set (code 4) is sent back to the source IP address.

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
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