From 43162507e33e573f4cd4acd6d20a1297f3623e76 Mon Sep 17 00:00:00 2001 From: Romain Date: Wed, 23 Jul 2025 12:04:04 +0200 Subject: [PATCH] Add a note for the removal of default MPTCP enablement in the migration guide --- docs/content/migration/v3.md | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/docs/content/migration/v3.md b/docs/content/migration/v3.md index 6581b5f39..dc29ae058 100644 --- a/docs/content/migration/v3.md +++ b/docs/content/migration/v3.md @@ -319,3 +319,14 @@ and Traefik now keeps them encoded to avoid any ambiguity. | `/foo/../bar` | PathPrefix(`/bar`) | Match | Match | | `/foo/%2E%2E/bar` | PathPrefix(`/foo`) | Match | No match | | `/foo/%2E%2E/bar` | PathPrefix(`/bar`) | No match | Match | + +## v3.4.5 + +### MultiPath TCP + +Since `v3.4.5`, the MultiPath TCP support introduced with `v3.4.2` has been removed. +It appears that enabling MPTCP on some platforms can cause Traefik to stop with the following error logs message: + +- `set tcp X.X.X.X:X->X.X.X.X:X: setsockopt: operation not supported` + +However, it can be re-enabled by setting the `multipathtcp` variable in the GODEBUG environment variable, see the related [go documentation](https://go.dev/doc/godebug#go-124).