Eduard, > On Mar 24, 2021, at 1:04 PM, Vasilenko Eduard <[email protected]> > wrote: > > Hi Joseph, > You have presented below (and in many other messages) a long list of policies > (extensive usage of “SHOULD”, “NEVER”, “MUST”) > That are new – would change how current tunnels operate
Some do, yes. To make them consistent and correct. > Why virtual link could not send ICMP PTB (like on a physical link)? Just > because… it is “unsolicited”. But one moment – any other PTB is unsolicited > too - It is an event. PTBs are only sent when a packet arrives at a router and the router decides to forward that packet to a link whose link MTU is too small. If the link MTU changes, there would never be an ICMP PTB *until* a new packet is sent. Go ahead - change the MTU of any interface (tunnel or not) of any router and tell me if you see a PTB being sent *ANYWHERE*. Nothing happens until the next packet goes to that interface. I.e., PTBs are always in response to an attempt to send a packet - not merely to an interface change. Joe
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