Kerio Tech Firewall6 Manuel d'utilisateur télécharger pdf (Page 63)

5.3 DNS Forwarder

Figure 5.10 Speciﬁc settings of DNS forwarding

DNS server can be speciﬁed for:

• DNS name — queries requiring names of computers will be forwarded to this DNS

server (so called A queries)

• a subnet — queries requiring IP addresses of the particular domain will be forwarded

to the DNS server (reverse domain — PTR queries)

Click on the Add or the Edit button to open a dialog where custom DNS forwarding rules

can be deﬁned.

• The Name DNS query option allows speciﬁcation of a rule for name queries. Use the

If the queried name matches entry to specify a corresponding DNS name (name of

a host in the domain).

It is usually desirable to forward queries to entire domains rather than to speciﬁc

names. Speciﬁcation of a domain name may therefore contain

wildcard symbol

(asterisk — substitutes any number of characters) and/or ? (question mark — sub-

stitutes a single character). The rule will be applied to all names matching with the

string (hosts, domains, etc.).

Example: DNS name will be represented by the string ?erio.c

. The rule will be

applied to all names in domains kerio.cz, cerio.com, aerio.c etc., such as on

www.kerio.cz, secure.kerio.com, www.aerio.c, etc.

Warning: It is necessary that the expression speciﬁed in the If the query contains

domain entry is an entire DNS name! If, for example, the kerio.c

expression is

introduced, only names kerio.cz, kerio.com etc. would match the rule and host

names included in these domains (such as www.kerio.cz and secure.kerio.com)

would not!

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Kerio Tech Firewall6 Manuel d'utilisateur Page 63