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docs: add documentation for enabling reverse DNS lookup with systemd-resolved (#6731) 

* Remove trailing whitespace in DNS forwarding guide.
* Add example for enabling reverse lookup of IP addrseses to .consul domain on systemd-resolved platforms
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Tom Downes 2020-02-18 07:16:12 -06:00 committed by GitHub
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website/source/docs/guides/forwarding.html.md
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@ -185,8 +185,16 @@ Binding to port 53 will usually require running either as a privileged user (or
CAP_NET_BIND_SERVICE capability). If using the Consul docker image you will need to add the following to the
environment to allow Consul to use the port: `CONSUL_ALLOW_PRIVILEGED_PORTS=yes`
Note: With this setup, PTR record queries will still be sent out
to the other configured resolvers in addition to Consul.
Note: With this setup, PTR record queries will still be sent out to the other configured resolvers in
addition to Consul. If you wish to restrict this behavior, your `resolved.conf` should be modified to
```
DNS=127.0.0.1
Domains=~consul ~0.10.in-addr.arpa
```
where the example corresponds to reverse lookups of addresses in the IP range `10.0.0.0/16`. Your
configuration should match your networks.
## iptables Setup