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---
title: "RFC2136"
date: 2019-03-03T16:39:46+01:00
draft: false
slug: rfc2136
---
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Since: v0.3.0
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Configuration for [RFC2136 ](https://tools.ietf.org/html/rfc2136 ).
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- Code: `rfc2136`
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_Please contribute by adding a CLI example._
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## Credentials
| Environment Variable Name | Description |
|-----------------------|-------------|
| `RFC2136_NAMESERVER` | Network address in the form "host" or "host:port" |
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| `RFC2136_TSIG_ALGORITHM` | TSIG algorithm. See [miekg/dns#tsig.go ](https://github.com/miekg/dns/blob/master/tsig.go ) for supported values. To disable TSIG authentication, leave the `RFC2136_TSIG*` variables unset. |
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| `RFC2136_TSIG_KEY` | Name of the secret key as defined in DNS server configuration. To disable TSIG authentication, leave the `RFC2136_TSIG*` variables unset. |
| `RFC2136_TSIG_SECRET` | Secret key payload. To disable TSIG authentication, leave the` RFC2136_TSIG*` variables unset. |
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The environment variable names can be suffixed by `_FILE` to reference a file instead of a value.
More information [here ](/lego/dns/#configuration-and-credentials ).
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## Additional Configuration
| Environment Variable Name | Description |
|--------------------------------|-------------|
| `RFC2136_DNS_TIMEOUT` | API request timeout |
| `RFC2136_POLLING_INTERVAL` | Time between DNS propagation check |
| `RFC2136_PROPAGATION_TIMEOUT` | Maximum waiting time for DNS propagation |
| `RFC2136_SEQUENCE_INTERVAL` | Interval between iteration |
| `RFC2136_TTL` | The TTL of the TXT record used for the DNS challenge |
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The environment variable names can be suffixed by `_FILE` to reference a file instead of a value.
More information [here ](/lego/dns/#configuration-and-credentials ).
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## More information
- [API documentation ](https://tools.ietf.org/html/rfc2136 )
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