User's Manual

https://www.peplink.com 73 Copyright @ 2019 Peplink
returned for every name ending with ".domain.name" except names that have their own
records.
TTL
This setting specifies the time to live of this record in external DNS caches.
In order to reflect any dynamic changes on the IP addresses in case of link failure and
recovery, this value should be set to a smaller value, e.g., 5 secs, 60 secs, etc.
Priority
This option specifies the priority of different connections.
Select the Default option to apply the Default Connection Priority (refer to the table
shown on the main DNS settings page) to an A record. To customize priorities, choose
the Custom option and a priority selection table will be shown at the bottom.
Included IP
Address(es)
This setting specifies lists of WAN-specific Internet IP addresses that are candidates to be
returned when the Peplink Balance responds to DNS queries for the domain name
specified by Host Name.
The IP addresses listed in each box as default are the Internet IP addresses associated
with each of the WAN connections. Static IP addresses that are not associated with any
WAN can be entered into the Custom IP list. A PTR record is also created for each custom
IP.
For WAN connections that operate under drop-in mode, there may be other routable IP
addresses in addition to the default IP address. Therefore, the Peplink Balance allows
custom Internet IP addresses to be added manually via filling the text box on the right-hand
side and clicking the button.
Only the checked IP addresses in the lists are candidates to be returned when responding
to a DNS query.
If a WAN connection is down, the corresponding set of IP addresses will not be returned.
However, the IP addresses in the Custom IP Address field will always be returned.
If the Connection Priority field is set to Custom, you can also specify the usage priority of
each WAN connection. Only selected IP address(es) of available connection(s) with the
highest priority, and custom IP addresses will be returned. By default, Connection Priority
is set to Default.
10.5.3.6
PTR Records
PTR records are created along with A records pointing to custom IPs. Please refer to Section
17.3.9 for details. For example, if you created an A record www.mydomain.com pointing to
11.22.33.44, then a PTR record 44.33.22.11.in-addr.arpa pointing to www.mydomain.com will
also be created. When there are multiple host names pointing to the same IP address, only one
PTR record for the IP address will be created. In order for PTR records to function, you also
need to create NS records. For example, if the IP address range 11.22.33.0 to 11.22.33.255 is
delegated to the DNS server on the Peplink Balance, you will also have to create a domain
33.22.11.in-addr.arpa and have its NS records pointing to your DNS server’s (the Peplink
Balance’s) public IP addresses. With the above records created, the PTR record creation is
complete.