3/6/2018
Proprietary and Confidential - Technicolor
79
Figure 8.1
The following table explains the traffic restrictions while setting the firewall level to various
levels – High, Medium, Low and Off.
Firewall
level
Restrictions on inbound
traffic
Restrictions on outbound
traffic
Remarks
High
All
unsolicited
inbound
traffic is blocked, and
Intrusion
Detection
is
enabled.
All
traffic
except
the
following are restricted:
• HTTP and HTTPS (TCP
ports 80, 443)
• DNS (TCP/UDP port 53)
• NTP (UDP ports 119, 123)
• Email (TCP ports 25, 110,
143, 465, 587, 993, 995)
• VPN (GRE, UDP port 500,
TCP port 1723)
• iTunes (TCP port 3689)
Both
inbound
and
outbound traffic are
restricted
Medium
Inbound traffic is blocked for
the following services:
No restrictions - Outbound
connections are allowed by
the firewall regardless of the
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