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6.6 Firewall
In this section we will look over the various firewall features that come with RUT950.
6.6.1 General Settings
The routers firewall is a standard Linux iptables package, which uses routing chains and policies to facilitate
control over inbound and outbound traffic.
Field Name
Sample value
Explanation
1.
Enable SYN-flood protection
Checked/Unchecked
When checked the router becomes more resistant
against SYN-flood attacks.
2.
Drop Invalid packets
Checked/Unchecked
A “Drop” action is performed on a packet that is
determined to be invalid
3.
Input
Reject/Drop/Accept
DEFAULT* action that is to be performed for
packets that pass through the Input chain.
4.
Output
Reject/Drop/Accept
DEFAULT* action that is to be performed for
packets that pass through the Output chain.
5.
Forward
Reject/Drop/Accept
DEFAULT* action that is to be performed for
packets that pass through the Forward chain.
*DEFAULT: When a packet goes through a firewall chain it is matched against all the rules for that specific chain. If
no rule matches said packet, an according Action (either Drop or Reject or Accept) is performed.
Accept Packet gets to continue down the next chain.
Drop Packet is stopped and deleted.
Reject Packet is stopped, deleted and, differently from Drop, an ICMP packet containing a message of rejection
is sent to the source of the dropped packet.
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