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IPTABLES rule in DNS rec running bind

ru flag

We have 4 DNS Recursive server and 2 authoritative server all of them running CentOs7 and Bind.

So we authorize only DNS 53 port for the anycast interface in rec servers. For iptables we found this rule:

4 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED

So my question is this a can security issue, it needed or no besides we are only need to allow a port53 for dns on the anycast interface.

anx avatar
fr flag
anx
Please [edit] to clarify a bit. As iptables rules are processed in order, a single rule does not say much about the full operation of your firewall rules, and *security issue* is a bit broad.
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