Andrey Osipuk 50b67a93d6 feat(server): client_mss_bulk — raise MSS after handshake to cut pps ...

client_mss (e.g. "tspu", MSS=92) fragments the whole connection to evade
DPI on the ServerHello, but it also fragments bulk payload, multiplying
outgoing packets-per-second ~10x. On hosts whose abuse detection counts
pps (not bandwidth) this trips packet-flood limits.

Add an optional [server].client_mss_bulk: keep the low client_mss for the
handshake (ServerHello stays fragmented => DPI bypass intact), then raise
the client socket MSS to client_mss_bulk once the connection enters the
post-handshake (bulk transfer) phase, so bulk data uses normal-size
segments and pps drops back to normal. Same preset/int grammar as
client_mss. Opt-in: when unset, the handshake MSS is kept for the whole
connection (unchanged behavior).

Linux-only (setsockopt TCP_MAXSEG via raw fd, mirroring TCP_USER_TIMEOUT);
no-op on other unix. Documented in CONFIG_PARAMS.{en,ru}.

2026-06-19 11:11:01 +03:00

..

CONFIG_PARAMS.en.md

feat(server): client_mss_bulk — raise MSS after handshake to cut pps

2026-06-19 11:11:01 +03:00

CONFIG_PARAMS.ru.md

feat(server): client_mss_bulk — raise MSS after handshake to cut pps

2026-06-19 11:11:01 +03:00