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What happens if a router

aglowack
Cisco Employee
Cisco Employee

‎12-17-2003 03:33 PM - edited ‎03-02-2019 12:25 PM

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

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Harold Ritter
Cisco Employee
Cisco Employee

‎12-17-2003 03:46 PM

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
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