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# The devp2p command
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The devp2p command line tool is a utility for low-level peer-to-peer debugging and
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protocol development purposes. It can do many things.
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### ENR Decoding
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Use `devp2p enrdump <base64>` to verify and display an Ethereum Node Record.
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### Node Key Management
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The `devp2p key ...` command family deals with node key files.
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Run `devp2p key generate mynode.key` to create a new node key in the `mynode.key` file.
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Run `devp2p key to-enode mynode.key -ip 127.0.0.1 -tcp 30303` to create an enode:// URL
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corresponding to the given node key and address information.
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### Maintaining DNS Discovery Node Lists
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The devp2p command can create and publish DNS discovery node lists.
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Run `devp2p dns sign <directory>` to update the signature of a DNS discovery tree.
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Run `devp2p dns sync <enrtree-URL>` to download a complete DNS discovery tree.
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Run `devp2p dns to-cloudflare <directory>` to publish a tree to CloudFlare DNS.
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Run `devp2p dns to-route53 <directory>` to publish a tree to Amazon Route53.
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You can find more information about these commands in the [DNS Discovery Setup Guide][dns-tutorial].
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### Discovery v4 Utilities
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The `devp2p discv4 ...` command family deals with the [Node Discovery v4][discv4]
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protocol.
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Run `devp2p discv4 ping <enode/ENR>` to ping a node.
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Run `devp2p discv4 resolve <enode/ENR>` to find the most recent node record of a node in
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the DHT.
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Run `devp2p discv4 crawl <nodes.json path>` to create or update a JSON node set.
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### Discovery v5 Utilities
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The `devp2p discv5 ...` command family deals with the [Node Discovery v5][discv5]
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protocol. This protocol is currently under active development.
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Run `devp2p discv5 ping <ENR>` to ping a node.
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Run `devp2p discv5 resolve <ENR>` to find the most recent node record of a node in
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the discv5 DHT.
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Run `devp2p discv5 listen` to run a Discovery v5 node.
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Run `devp2p discv5 crawl <nodes.json path>` to create or update a JSON node set containing
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discv5 nodes.
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### Discovery Test Suites
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The devp2p command also contains interactive test suites for Discovery v4 and Discovery
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v5.
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To run these tests against your implementation, you need to set up a networking
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environment where two separate UDP listening addresses are available on the same machine.
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The two listening addresses must also be routed such that they are able to reach the node
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you want to test.
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For example, if you want to run the test on your local host, and the node under test is
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also on the local host, you need to assign two IP addresses (or a larger range) to your
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loopback interface. On macOS, this can be done by executing the following command:
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sudo ifconfig lo0 add 127.0.0.2
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You can now run either test suite as follows: Start the node under test first, ensuring
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that it won't talk to the Internet (i.e. disable bootstrapping). An easy way to prevent
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unintended connections to the global DHT is listening on `127.0.0.1`.
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Now get the ENR of your node and store it in the `NODE` environment variable.
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Start the test by running `devp2p discv5 test -listen1 127.0.0.1 -listen2 127.0.0.2 $NODE`.
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### Eth Protocol Test Suite
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The Eth Protocol test suite is a conformance test suite for the [eth protocol][eth].
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To run the eth protocol test suite against your implementation, the node needs to be initialized as such:
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1. initialize the geth node with the `genesis.json` file contained in the `testdata` directory
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2. import the `halfchain.rlp` file in the `testdata` directory
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3. run geth with the following flags:
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```
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geth --datadir <datadir> --nodiscover --nat=none --networkid 19763 --verbosity 5
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```
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Then, run the following command, replacing `<enode ID>` with the enode of the geth node:
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```
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devp2p rlpx eth-test <enode ID> cmd/devp2p/internal/ethtest/testdata/fullchain.rlp cmd/devp2p/internal/ethtest/testdata/genesis.json
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```
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[eth]: https://github.com/ethereum/devp2p/blob/master/caps/eth.md
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[dns-tutorial]: https://geth.ethereum.org/docs/developers/dns-discovery-setup
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[discv4]: https://github.com/ethereum/devp2p/tree/master/discv4.md
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[discv5]: https://github.com/ethereum/devp2p/tree/master/discv5/discv5.md
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