Found it: tcp_mtu_probing
On Fri, Jan 22, 2016 at 11:39 AM, Tom Herbert <t...@herbertland.com> wrote: > This came up on in one of the IETF mailing lists in the context that > PMTUD doesn't really work on the Internet so PLPMTUD is the way to > go. Looking at the code I only see inet_csk_update_pmtu called from > ICMP PTB error. I am missing something? > > Thanks, > Tom