GoWiki | daniel | INWX DynDNS

# Overview
One free user (subdomain) https://www.inwx.de/de/offer/dyndns

schema: `https://<username>:<password>@dyndns.inwx.com/nic/update?myip=<ip4addr>`

schema with ipv6: `https://<username>:<password>@dyndns.inwx.com/nic/update?myip=<ip4addr>&myipv6=<ip6addr>`

create user and password with subdomain https://www.inwx.de/de/nameserver2/dyndns

# Update command
Plain:
```
https://dyndns.inwx.com/nic/update?myip=<ip4addr>
```

cURL: 
```
curl -sf -u <username>:<password> "https://dyndns.inwx.com/nic/update?myip=<ip4addr>"
```

OpenBSD's [ftp](https://man.openbsd.org/ftp.1): 
```
ftp -o /dev/null "https://<username>:<password>@dyndns.inwx.com/nic/update?myip=<ip4addr>"
```

# crontab
as user nobody

## openbsd
asdf

```
#!/bin/sh
username=""
password=""
domain="dyndns.example.com"
ipv4=$(dig +short @ident.me)
dyn_ip=$(dig +short ${domain})

[ $ipv4 = $dyn_ip ] && exit 0

ftp -o /dev/null "https://${username}:${password}@dyndns.inwx.com/nic/update?myip=${ipv4}" && \
  logger "IP adress of DNS A Record from ${domain} updated to ${ipv4}"
```

## linux
asdf