Building network automation solutions

9 module online course

Start now!


  1. Huge topic, nobody likes it, but difficult to avoid this (I am facing it for last 26 years of my life).

    Maybe you will find it interesting:

    - Multicasts and PMTUD - not sure if anything has changed since I last touched the topic (the big multicast packet is silently dropped w/o sending back any ICMP message and it was as RFC stated) and we need to fragment the multicast packets

    -if fragmentation is required on the tunnel we can either fragment inner (before encapsulation) or outer packets (encapsulated)- consequences are different.
    When inner packet is fragmented the endpoint can reassemble the packets; when outer packet is fragmented the other side of the tunnel is reponsible for it as we need to reassemble packet before de-encapsulating it

    - when fragmenting multicast packets - can the endpoint host reassemble them? Always?

    - implementation matters and all the kludges vendor have for this

    - etc
Add comment