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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 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` 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 Note: With this setup, PTR record queries will still be sent out to the other configured resolvers in
to the other configured resolvers in addition to Consul. 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 ## iptables Setup