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docs: document the global ip cache behaviour in quirky networking environments (#8696)

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Yat Ho
2026-03-20 07:01:27 +08:00
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commit 9387db8e3e
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8
libtransmission/ip-cache.h
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@@ -28,11 +28,17 @@
* This class caches 3 useful info:
* 1. Whether your machine supports the IP protocol
* 2. Source address used for global connections
* 3. Global address (IPv4 public address/IPv6 global unicast address)
* 3. Global address (IPv4 public address/IPv6 global unicast address) retrieved
* from HTTP IP query endpoints on the Internet.
*
* The idea is, if this class successfully cached a source address, that means
* your system is capable in that IP protocol. And if the global address is
* the same as the source address, then you are not behind a NAT.
*
* The global address cached in this class is not to be trusted 100%. Although
* uncommon, your BT packets might be routed differently than HTTP traffic such
* that your global address appears differently to other BT clients than the IP
* query services.
*/
class tr_ip_cache : public std::enable_shared_from_this<tr_ip_cache>
{