Specifications

Firewall Protection
136
ProSAFE Gigabit Quad WAN SSL VPN Firewall SRX5308
Overview of Rules to Block or Allow Specific Kinds of
Traffic
• Outbound Rules (Service Blocking)
• Inbound Rules (Port Forwarding)
• Order of Precedence for Rules
Firewall rules are used to block or allow specific traffic passing through from one side to the
other
.
You can configure up to 600 firewall rules on the VPN firewall (see the following table).
Inbound rules (WAN to LAN) restrict access by outsiders to private resources, selectively
allowing only specific outside users to access specific resources. Outbound rules (LAN to
WAN) determine what outside resources local users can have access to.
A firewall has two default rules, one for inbound traffic and one for outbound. The default
rules of the VPN firewall are:
• Inbound. Block all access from outside except responses to requests from the LAN side.
• Outbound. Allow all access from the LAN side to the outside.
The firewall rules for blocking and allowing traf
fic on the VPN firewall can be applied to LAN
WAN traf
fic, DMZ WAN traffic, and LAN DMZ traffic.
The rules to block or allow traffic are based on the traffic’s category of service:
• Outbound rules (service blocking). Outbound traffic is allowed unless you configure
the firewall to block specific or all outbound traf
fic.
• Inbound rules (port forwarding). Inbound traffic is blocked unless the traf
fic is in
response to a request from the LAN side. You can configure the firewall to allow specific
or all inbound traffic.
• Customized services. Y
ou can add additional services to the list of services in the
factory defaults list. You can then define rules for these added services to either allow or
block that traffic (see Add Customized Services on page 177).
• Quality of Service (QoS) priorities. Each service has its own native priority that impacts
its quality of performance and tolerance for jitter or delays. Y
ou can change the QoS
priority, which changes the traffic mix through the system (see Create Quality of Service
Profiles for IPv4 Firewall Rules on page 184 and Quality of Service Priorities for IPv6
Firewall Rules on page 186).
Table 32. Number of supported firewall rule configurations
Traffic Rule Maximum Number of
Outbound Rules
Maximum Number of
Inbound Rules
Maximum Number of
Combined Supported Rules
LAN WAN 300 300 600
DMZ WAN 50 50 100
LAN DMZ 50 50 100
T
otal Rules 400 400 800