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An enterprise-grade Java-based, Apache 2.0 licensed Ethereum client https://wiki.hyperledger.org/display/besu
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50 lines
2.4 KiB
50 lines
2.4 KiB
description: Pantheon networking is about P2P discovery and communication between peers and access to the JSON RPC APIs
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# Networking
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Pantheon uses the network to find and connect to peers.
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## Firewalls and Incoming Connections
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The default logging configuration does not list node connection and disconnection messages.
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To enable listing of node connection and disconnection messages, specify the
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[`--logging`](../Reference/Pantheon-CLI-Syntax.md#logging) command line option `--logging=DEBUG`.
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For more verbosity, specify `--logging=TRACE`.
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The console logs connection and disconnection events when the log level is `DEBUG` or higher.
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If `Successfully accepted connection from ...` is displayed, connections are getting through the firewalls.
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!!! example "Example log output"
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`2018-10-16 12:37:35.479-04:00 | nioEventLoopGroup-3-1 | INFO | NettyP2PNetwork | Successfully accepted connection from 0xa979fb575495b8d6db44f750317d0f4622bf4c2aa3365d6af7c284339968eef29b69ad0dce72a4d8db5ebb4968de0e3bec910127f134779fbcb0cb6d3331163c`
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If connections are not getting through the firewalls, ensure the peer discovery port is open on your firewall.
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## Peer Discovery Port
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The [`--p2p-host`](../Reference/Pantheon-CLI-Syntax.md#p2p-host) and [`--p2p-port`](../Reference/Pantheon-CLI-Syntax.md#p2p-port)
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options specifies the host and port on which P2P peer discovery listens. The default is `127.0.0.1`
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for host and `30303` for port.
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## Limiting Peers
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Limiting peers reduces the bandwidth used by Pantheon. It also reduces the CPU time and disk access
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used to manage and respond to peers.
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Use the [`--max-peers`](../Reference/Pantheon-CLI-Syntax.md#max-peers) command line option to reduce
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the maximum number of peers. The default is 25.
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## No Discovery
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The [`--discovery-enabled`](../Reference/Pantheon-CLI-Syntax.md#discovery-enabled) command line option
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can be used to disable P2P peer discovery.
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Set this option to `false` if you are running a test node or a test network with fixed nodes.
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Use the [`admin_addPeer`](../Reference/JSON-RPC-API-Methods.md#admin_addpeer) JSON-RPC method to add peers when
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[`--discovery-enabled`](../Reference/Pantheon-CLI-Syntax.md#discovery-enabled) is set to false.
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## Monitoring Peer Connections
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Use the [`debug_metrics`](../Reference/JSON-RPC-API-Methods.md#debug_metrics) JSON-RPC API method
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to obtain information about peer connections. |