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diff --git a/doc/zmq.md b/doc/zmq.md index 3a1194de1c..ac26fc0a48 100644 --- a/doc/zmq.md +++ b/doc/zmq.md @@ -98,6 +98,20 @@ ZMQ_SUBSCRIBE option set to one or either of these prefixes (for instance, just `hash`); without doing so will result in no messages arriving. Please see [`contrib/zmq/zmq_sub.py`](/contrib/zmq/zmq_sub.py) for a working example. +The ZMQ_PUB socket's ZMQ_TCP_KEEPALIVE option is enabled. This means that +the underlying SO_KEEPALIVE option is enabled when using a TCP transport. +The effective TCP keepalive values are managed through the underlying +operating system configuration and must be configured prior to connection establishment. + +For example, when running on GNU/Linux, one might use the following +to lower the keepalive setting to 10 minutes: + +sudo sysctl -w net.ipv4.tcp_keepalive_time=600 + +Setting the keepalive values appropriately for your operating environment may +improve connectivity in situations where long-lived connections are silently +dropped by network middle boxes. + ## Remarks From the perspective of bitcoind, the ZeroMQ socket is write-only; PUB |