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# reverse
The *reverse* middleware allows CoreDNS to respond dynamicly to an PTR request and the related A/AAAA request.
## Syntax
~~~
reverse NETWORK... {
hostname TEMPLATE
[ttl TTL]
[fallthrough]
~~~
* **NETWORK** one or more CIDR formatted networks to respond on.
* `hostname` inject the IP and zone to an template for the hostname. Defaults to "ip-{IP}.{zone[1]}". See below for template.
* `ttl` defaults to 60
* `fallthrough` If zone matches and no record can be generated, pass request to the next middleware.
### Template Syntax
The template for the hostname is used for generating the PTR for an reverse lookup and matching the
forward lookup back to an IP.
#### `{ip}`
The `{ip}` symbol is **required** to make reverse work.
For IPv4 lookups the "." is replaced with an "-", i.e.: 10.1.1.1 results in "10-1-1-1"
With IPv6 lookups the ":" is removed, and any zero ranged are expanded, i.e.:
"ffff::ffff" results in "ffff000000000000000000000000ffff"
#### `{zone[i]}`
The `{zone[i]}` symbol is **optional** and can be replaced by a fixed (zone) string.
The zone will be matched by the zones listed in *this* configuration stanza.
`i` needs to be replaced to the index of the configured listener zones, starting with 1.
## Examples
~~~ txt
arpa compute.internal {
# proxy unmatched requests
proxy . 8.8.8.8
# answer requests for IPs in this networks
# PTR 1.0.32.10.in-addr.arpa. 3600 ip-10-0-32-1.compute.internal.
# A ip-10-0-32-1.compute.internal. 3600 10.0.32.1
# v6 is also possible
# PTR 1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.1.0.d.f.ip6.arpa. 3600 ip-fd010000000000000000000000000001.compute.internal.
# AAAA ip-fd010000000000000000000000000001.compute.internal. 3600 fd01::1
reverse 10.32.0.0/16 fd01::/16 {
# template of the ip injection to hostname, zone resolved to compute.internal.
hostname ip-{ip}.{zone[2]}
ttl 3600
# Forward unanswered or unmatched requests to proxy # without this flag, requesting A/AAAA
records on compute.internal. will end here.
fallthrough
}
}
~~~
~~~ txt
32.10.in-addr.arpa.arpa arpa.company.org {
reverse 10.32.0.0/16 {
# template of the ip injection to hostname, zone resolved to arpa.company.org.
hostname "ip-{ip}.v4.{zone[2]}"
ttl 3600
# fallthrough is not required, v4.arpa.company.org. will be only answered here
}
# cidr closer to the ip wins, so we can overwrite the "default"
reverse 10.32.2.0/24 {
# its also possible to set fix domain suffix
hostname ip-{ip}.fix.arpa.company.org.
ttl 3600
}
}
~~~
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