Always reply to MTU probes via UDP.
It could sometime happen that a node would return MTU probes via TCP, which does not make a lot of sense.
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@ -135,7 +135,7 @@ void mtu_probe_h(node_t *n, vpn_packet_t *packet, length_t len) {
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if(!packet->data[0]) {
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packet->data[0] = 1;
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send_packet(n, packet);
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send_udppacket(n, packet);
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} else {
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if(len > n->maxmtu)
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len = n->maxmtu;
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