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The check is activated by default, but can be deactivated if required in the configuration in the menu DNS → Filter/Aliases → DNS Tunnel Filter. However, we recommend not deactivating the check.
Possible error pattern that can occur when the check is activated:
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The error pattern can be analysed with a DNS trace on the LANCOM router (see the following figure):
In this case, the following additional entries are written in the syslog of the LANCOM router:
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