> On Feb 24, 2021, at 9:01 AM, Tom Herbert <tom@xxxxxxxxxxxxxxx> wrote: > > The problems have been caused by some > routers implementations that have assumed unwritten requirements (like > routers must access transport layer), For the record, I don't know that this is a "router implementation" issue as much as it is an "operator requirement" interacting with the design of IPv4/IPv6 and UDP/TCP/ICMP. The protocol number, which operators filter on in ACLs, is carried in the transport layer headers.
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