Increase MTU by 4 bytes to allow VLAN tagged Ethernet frames in hub and switch mode.

[tinc] / src / net.h

diff --git a/src/net.h b/src/net.h
index 54663aa..b5692ef 100644 (file)
--- a/src/net.h
+++ b/src/net.h
@@ -28,9 +28,9 @@
 #include "ipv6.h"
 
 #ifdef ENABLE_JUMBOGRAMS
-#define MTU 9014                               /* 9000 bytes payload + 14 bytes ethernet header */
+#define MTU 9018                               /* 9000 bytes payload + 14 bytes ethernet header + 4 bytes VLAN tag */
 #else
-#define MTU 1514                               /* 1500 bytes payload + 14 bytes ethernet header */
+#define MTU 1518                               /* 1500 bytes payload + 14 bytes ethernet header + 4 bytes VLAN tag */
 #endif
 
 #define MAXSIZE (MTU + 4 + EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + MTU/64 + 20)       /* MTU + seqno + padding + HMAC + compressor overhead */