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---
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2020-09-01 15:14:13 +00:00
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layout: commands
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page_title: 'Commands: RTT'
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description: |
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The rtt command estimates the network round trip time between two nodes.
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---
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# Consul RTT
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Command: `consul rtt`
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2022-01-11 13:26:58 +00:00
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Corresponding HTTP API Endpoints: [\[GET\] /v1/coordinate/datacenters](/api-docs/coordinate#read-wan-coordinates), [\[GET\] /v1/coordinate/nodes](/api-docs/coordinate#read-lan-coordinates-for-all-nodes)
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2022-01-10 17:40:11 +00:00
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2015-10-22 00:29:43 +00:00
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The `rtt` command estimates the network round trip time between two nodes using
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Consul's network coordinate model of the cluster.
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2020-04-09 23:46:54 +00:00
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See the [Network Coordinates](/docs/internals/coordinates) internals guide
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for more information on how these coordinates are computed.
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2022-01-10 21:44:56 +00:00
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The table below shows this command's [required ACLs](/api#authentication). Configuration of
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[blocking queries](/api/features/blocking) and [agent caching](/api/features/caching)
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are not supported from commands, but may be from the corresponding HTTP endpoint.
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2022-01-11 14:41:54 +00:00
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| ACL Required |
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| ----------------------- |
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| `node:read`<sup>1</sup> |
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<p>
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<sup>1</sup> When referencing WAN coordinates, no ACL permission is needed.
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</p>
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## Usage
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Usage: `consul rtt [options] node1 [node2]`
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At least one node name is required. If the second node name isn't given, it
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is set to the agent's node name. These are the node names as known to
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Consul as the `consul members` command would show, not IP addresses.
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2017-02-10 00:38:06 +00:00
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#### API Options
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@include 'http_api_options_client.mdx'
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#### Command Options
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- `-wan` - Instructs the command to use WAN coordinates instead of LAN
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coordinates. By default, the two nodes are assumed to be nodes in the local
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datacenter and the LAN coordinates are used. If the -wan option is given,
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then the WAN coordinates are used, and the node names must be suffixed by a period
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and the datacenter (eg. "myserver.dc1"). It is not possible to measure between
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2017-03-14 05:56:24 +00:00
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LAN coordinates and WAN coordinates, so both nodes must be in the same area.
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2015-12-21 23:16:48 +00:00
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The following environment variables control accessing the HTTP server via SSL:
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- `CONSUL_HTTP_SSL` Set this to enable SSL
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- `CONSUL_HTTP_SSL_VERIFY` Set this to disable certificate checking (not recommended)
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## Output
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If coordinates are available, the command will print the estimated round trip
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time between the given nodes:
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2020-05-19 18:32:38 +00:00
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```shell-session
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$ consul rtt n1 n2
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Estimated n1 <-> n2 rtt: 0.610 ms (using LAN coordinates)
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$ consul rtt n2 # Running from n1
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Estimated n1 <-> n2 rtt: 0.610 ms (using LAN coordinates)
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$ consul rtt -wan n1.dc1 n2.dc2
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Estimated n1.dc1 <-> n2.dc2 rtt: 1.275 ms (using WAN coordinates)
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```
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