Don't send MTU probes smaller than 512 bytes.

[tinc] / src / net_packet.c

diff --git a/src/net_packet.c b/src/net_packet.c
index 1397060..626114c 100644 (file)
--- a/src/net_packet.c
+++ b/src/net_packet.c
@@ -927,13 +927,13 @@ static void try_mtu(node_t *n) {
                const length_t probes_per_cycle = 8;
 
                /* This magic value was determined using math simulations.
-                  It will result in a 1339-byte first probe, followed (if there was a reply) by a 1417-byte probe.
-                  Since 1417 is just below the range of tinc MTUs over typical networks,
+                  It will result in a 1329-byte first probe, followed (if there was a reply) by a 1407-byte probe.
+                  Since 1407 is just below the range of tinc MTUs over typical networks,
                   this fine-tuning allows tinc to cover a lot of ground very quickly. */
-               const float multiplier = 0.982;
+               const float multiplier = 0.97;
 
                const float cycle_position = probes_per_cycle - (n->mtuprobes % probes_per_cycle) - 1;
-               const length_t minmtu = MAX(n->minmtu, 64);
+               const length_t minmtu = MAX(n->minmtu, 512);
                const float interval = n->maxmtu - minmtu;
 
                /* The core of the discovery algorithm is this exponential.