Jeremy Harris via Exim-users wrote: > On 28/09/2022 08:40, Victor Sudakov via Exim-users wrote: > > I wonder what I will lose if I leave net.ipv4.tcp_fastopen=0 on the > > mail server (not very loaded)? > > Not much unless your system also runs a high rate of TCP connections for > other services (eg. web). The bug (it's in the Linux firewall) might > be for client connections only; I'm not certain. Fix is in the 5.17 kernel. > However, all TCP-using services which are coded to try TFO will > be affected in the same way as SMTP.
Maybe I'd be better off setting hosts_try_fastopen to ":" in Exim only, just in case? -- Victor Sudakov VAS4-RIPE http://vas.tomsk.ru/ 2:5005/49@fidonet -- ## List details at https://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
