add enet_mtu_1300.patch

.gitignore

@@ -27,6 +27,7 @@ encrypt_credentials.go
 src/anticheat/*credentials*
 src/anticheat/key*
 dist
+fly.io
 
 Dockertrigger
 !/**/.gitkeep

Makefile

@@ -82,6 +82,7 @@ apply-patches:
 	$(PATCH) < patches/serverbotbalanceearly.patch
 	$(PATCH) < patches/filterservers.patch
 	$(PATCH) < patches/bans.patch
+	$(PATCH) < patches/enet_mtu_1300.patch
 	cd src && make depend
 
 gzip-cfgs:

anticheat.sh

@@ -3,7 +3,6 @@
 cd $(dirname $0) # change into script directory in case it's called from somewhere else
 
 # SAUER_OPTIONS contains any command line options you would like to start Sauerbraten with.
-#SAUER_OPTIONS="-f"
 SAUER_OPTIONS="-q${HOME}/.sauerbraten"
 
 if [ "${XDG_SESSION_TYPE}" = wayland ]

patches/enet_mtu_1300.patch

@@ -0,0 +1,16 @@
+this patch is needed in order to run servers on fly.io. due to their anycast setup, they tunnel and encrypt the UDP traffic.
+see https://fly.io/docs/app-guides/udp-and-tcp/#you-might-need-to-be-mindful-of-mtus
+
+diff --git src/enet/include/enet/enet.h src/enet/include/enet/enet.h
+index fc45cbd..2246327 100644
+--- src/enet/include/enet/enet.h
++++ src/enet/include/enet/enet.h
+@@ -212,7 +212,7 @@ enum
+    ENET_HOST_RECEIVE_BUFFER_SIZE          = 256 * 1024,
+    ENET_HOST_SEND_BUFFER_SIZE             = 256 * 1024,
+    ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL  = 1000,
+-   ENET_HOST_DEFAULT_MTU                  = 1400,
++   ENET_HOST_DEFAULT_MTU                  = 1300,
+    ENET_HOST_DEFAULT_MAXIMUM_PACKET_SIZE  = 32 * 1024 * 1024,
+    ENET_HOST_DEFAULT_MAXIMUM_WAITING_DATA = 32 * 1024 * 1024,
+

src/enet/include/enet/enet.h

@@ -212,7 +212,7 @@ enum
    ENET_HOST_RECEIVE_BUFFER_SIZE          = 256 * 1024,
    ENET_HOST_SEND_BUFFER_SIZE             = 256 * 1024,
    ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL  = 1000,
-   ENET_HOST_DEFAULT_MTU                  = 1400,
+   ENET_HOST_DEFAULT_MTU                  = 1300,
    ENET_HOST_DEFAULT_MAXIMUM_PACKET_SIZE  = 32 * 1024 * 1024,
    ENET_HOST_DEFAULT_MAXIMUM_WAITING_DATA = 32 * 1024 * 1024,