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AT-WR4500 Series - IEEE 802.11abgh Outdoor Wireless Routers 131
RouterOS v3 Configuration and User Guide
Description
The RouterOS has an embedded DNS server feature in DNS cache. It allows you to link the
particular domain names with the respective IP addresses and advertize these links to the DNS clients
using the router as their DNS server. This feature can also be used to provide fake DNS information to
your network clients. For example, resolving any DNS request for a certain set of domains (or for the
whole Internet) to your own page.
The server is capable of resolving DNS requests based on POSIX basic regular expressions, so that
multiple requets can be matched with the same entry. In case an entry does not conform with DNS
naming standards, it is considered a regular expression and marked with ‘R’ flag.
The list is ordered and is checked from top to bottom. Regular expressions are checked first, then the
plain records.
Property Description
address (IP address) - IP address to resolve domain name with
name (text) - DNS name to be resolved to a given IP address. May be a regular expression
ttl (time) - time-to-live of the DNS record
Reverse DNS lookup (Address to Name) of the regular expression entries is not possible. You can,
however, add an additional plain record with the same IP address and specify some name for
it.Remember that the meaning of a dot (.) in regular expressions is any character, so the expression
should be escaped properly. For example, if you need to match anything within example.com domain
but not all the domains that just end with example.com, like www.another-example.com, use
name=".*\\.example\\.com"Regular expression matching is significantly slower than of the plain entries,
so it is advised to minimize the number of regular expression rules and optimize the expressions
themselves.
Example
To add a static DNS entry for www.example.com to be resolved to 10.0.0.1 IP address:
[admin@AT-WR4562] ip dns static> add name www.example.com address=10.0.0.1
[admin@AT-WR4562] ip dns static> print
Flags: D - dynamic, X - disabled, R - regexp
# NAME ADDRESS TTL
0 www.example.com 10.0.0.1 1d
[admin@AT-WR4562] ip dns static>
6.6 Flushing DNS cache
Command name: /ip dns cache flush
Command Description
flush - clears internal DNS cache
Example
[admin@AT-WR4562] ip dns> cache flush
[admin@AT-WR4562] ip dns> print
primary-dns: 159.148.60.2
secondary-dns: 0.0.0.0
allow-remote-requests: yes
cache-size: 2048 KiB
cache-max-ttl: 1w
cache-used: 10 KiB
[admin@AT-WR4562] ip dns>