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Try bringing back TTL escalation -- may help with Docker (IP-MASQ) type NAT

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This commit is contained in:
Adam Ierymenko
2015-11-09 15:44:13 -08:00
parent 94f4316a0e
commit 2cc50bdb10
7 changed files with 58 additions and 19 deletions
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6
node/Switch.cpp
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@ -435,7 +435,7 @@ void Switch::rendezvous(const SharedPtr<Peer> &peer,const InetAddress &localAddr
{
TRACE("sending NAT-t message to %s(%s)",peer->address().toString().c_str(),atAddr.toString().c_str());
const uint64_t now = RR->node->now();
peer->sendHELLO(RR,localAddr,atAddr,now);
peer->sendHELLO(RR,localAddr,atAddr,now,2); // first attempt: send low-TTL packet to 'open' local NAT
{
Mutex::Lock _l(_contactQueue_m);
_contactQueue.push_back(ContactQueueEntry(peer,now + ZT_NAT_T_TACTICAL_ESCALATION_DELAY,localAddr,atAddr));
@ -509,8 +509,8 @@ unsigned long Switch::doTimerTasks(uint64_t now)
if (qi->strategyIteration == 0) {
// First strategy: send packet directly to destination
qi->peer->sendHELLO(RR,qi->localAddr,qi->inaddr,now);
} else if (qi->strategyIteration <= 4) {
// Strategies 1-4: try escalating ports for symmetric NATs that remap sequentially
} else if (qi->strategyIteration <= 3) {
// Strategies 1-3: try escalating ports for symmetric NATs that remap sequentially
InetAddress tmpaddr(qi->inaddr);
int p = (int)qi->inaddr.port() + qi->strategyIteration;
if (p < 0xffff) {