/* This magic value was determined using math simulations.
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 = 0.97;
+ this fine-tuning allows tinc to cover a lot of ground very quickly.
+ This fine-tuning is only valid for maxmtu = MTU; if maxmtu is smaller,
+ then it's better to use a multiplier of 1. Indeed, this leads to an interesting scenario
+ if choose_initial_maxmtu() returns the actual MTU value - it will get confirmed with one single probe. */
+ const float multiplier = (n->maxmtu == MTU) ? 0.97 : 1;
const float cycle_position = probes_per_cycle - (n->mtuprobes % probes_per_cycle) - 1;
const length_t minmtu = MAX(n->minmtu, 512);