> On Sep 11, 2019, at 7:50 AM, Joe Touch <[email protected]> wrote: > > Second, the problem with the logic that “bigger avoids fragmentation” is that > the very specification of ANY minimum MTU, coupled with IP-in-IP tunnels (for > their own sake, or as part of IPsec tunnel mode), ends up then requiring > fragmentation. There’s no way around that - once there’s a required minimum > and once it’s recursive, the game is over.
Indeed. My perception is that the larger the difference between the packet size sent and the smallest link MTU the packet will encounter, the lower the probability that the packet will get fragmented in flight - in IPv4 - or will result in an ICMP PTB message. The only size that completely prevents those outcomes is to not send the packet. _______________________________________________ Int-area mailing list [email protected] https://www.ietf.org/mailman/listinfo/int-area
