Filter
Top Products
Chapter 5 Settings for Interfaces and Network Services
62
they are considered primary, secondary, etc.). This option should be used when
there is the need to monitor where DNS queries are forwarded to or to create a
more complex configuration.
Enable cache for faster response of repeated queries
If this option is on, all responses will be stored in local DNS Forwarder cache.
Responses to repeated queries will be much faster (the same query sent by various
clients is also considered as a repeated query).
Physically, the DNS cache is kept in RAM. However, all DNS records are also saved in
the DnsCache.cfg file (see chapter 23.2). This means that records in DNS cache are
kept even after WinRoute Firewall Engine is stopped or WinRoute is disconnected.
Notes:
1. Time period for keeping DNS logs in the cache is specified individually in each
log (usually 24 hours).
2. Use of DNS also speeds up activity of the built-in proxy server (see chapter 5.5).
Clear cache
Click this button to remove all records in the DNS Forwarder’s cache (regardless of
their lifetime). This feature can be helpful e.g. for configuration changes, dial-up
testing, error detection, etc.
Use custom forwarding
Use this option to enable settings for forwarding certain DNS queries to other DNS
servers.
Enable DNS forwarding
DNS forwarder allows forwarding of certain DNS requests to specific DNS servers. Re-
quest forwarding is defined by rules for DNS names or subnets. If a DNS name or a sub-
net in a request matches a rule, the request is forwarded to the corresponding DNS
server. Requests matching no rule are forwarded to DNS servers in accordance with
settings in the DNS forwarding section (see above).
Note: If the simple DNS resolution is enabled (see below), the forwarding rules are ap-
plied only if the DNS Forwarder is not able to respond by using the information in the
hosts system file and/or by the DHCP lease table.
DNS forwarding can be helpful for example when we intend to use a local DNS server
for the local domain (the other DNS queries will be forwarded to the Internet directly —
this will speed up the response). DNS forwarder’s settings also play role in configuration
of private networks where it is necessary to provide correct forwarding of requests for
names in domains of remote subnets (for details, check chapter
21).
Use the Define button to open the dialog for definition of DNS forwarding rules.