I've heard various comments on this, so I want to double-check it.
Is it ok if only UDP/53 is left open, to serve DNS requests? As much as
I have understood, I can safely close TCP/53. The server in question is
a 'small' one (meaning: not so many requests per day, and only requests
for www/dns/mail will probably come there anyway).
I have been looking at the traffic for past 24 hours, and as much as I
can see, everything works fine (some requests come first to TCP/53, but
they are resent after few secs to UDP/53). However, I might break
something without knowing it :)
Any advices?
Thanks in advance.
Vanja
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