Kerio Tech KERIO WINROUTE FIREWALL 6 User Manual download pdf (Page 120)

Chapter 8 Conﬁguration of network services

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• free — user can choose from several second level domains (e.g. no-ip.org,

ddns.info, etc.) and select a free host name for the domain (e.g.

company.ddns.info).

• paid service — user registers their own domain (e.g. company.com) and the service

provider then provides DNS server for this domain with the option of automatic up-

date of records.

User of the service gets an account which is used for access authentication (this will guarantee

that only authorized users can update DNS records. Update is performed via secured connec-

tion (typically HTTPS) to make sure that the traﬃc cannot be tapped. Dynamic DNS records

can be updated either manually by the user or (mostly) by a specialized software — WinRoute

in this case.

If WinRoute enables cooperation with dynamic DNS, a request for update of the IP address

in dynamic DNS is sent upon any change of the Internet interface’s IP address (including

switching between primary and secondary Internet connection — see chapter 6.3). This keeps

DNS record for the particular IP address up-to-date and mapped services may be accessed by

the corresponding host name.

Note:

1. Usage of DDNS follows conditions of the particular provider.

2. Dynamic DNS records use very short time-to-live (TTL) and, therefore, they are kept in

cache of other DNS servers or forwarders for a very short time. Probability that the client

receives DNS response with an invalid (old) IP address is, therefore, very low.

3. Some DDNS servers also allow concurrent update of more records. Wildcards are used for

this purpose.

Example: In DDNS there exist two host names, both linked to the public IP address of

the ﬁrewall: fw.company.com and server.company.com. If the IP address is changed,

it is therefore possible to send a single request for update of DNS records with name

.company.com. This requests starts update of DNS records of both names.

DDNS conﬁguration in WinRoute

To set cooperation with the dynamic DNS server, go to the Dynamic DNS folder in Conﬁgura-

tion → Advanced Options.

As already mentioned, the ﬁrst step is to make an account (i.e. required dynamic DNS record

with appropriate access rights) at a DDNS provider. WinRoute now supports these DDNS

providers:

• ChangeIP (http://www.changeip.com/),

• DynDNS (http://www.dyndns.org/),

• No-IP (

http://www.no-ip.com/).

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Kerio Tech KERIO WINROUTE FIREWALL 6 User Manual Page 120