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-rw-r--r--nixos/modules/services/web-servers/caddy/default.nix3
1 files changed, 3 insertions, 0 deletions
diff --git a/nixos/modules/services/web-servers/caddy/default.nix b/nixos/modules/services/web-servers/caddy/default.nix
index e1456091717d4..50213ec252ff2 100644
--- a/nixos/modules/services/web-servers/caddy/default.nix
+++ b/nixos/modules/services/web-servers/caddy/default.nix
@@ -290,6 +290,9 @@ in
       }
     '';
 
+    # https://github.com/lucas-clemente/quic-go/wiki/UDP-Receive-Buffer-Size
+    boot.kernel.sysctl."net.core.rmem_max" = mkDefault 2500000;
+
     systemd.packages = [ cfg.package ];
     systemd.services.caddy = {
       wants = map (hostOpts: "acme-finished-${hostOpts.useACMEHost}.target") acmeVHosts;