Network > Network Profiles
> Zone Protection > Protocol Protection
The firewall normally allows non-IP protocols between Layer 2
zones and between virtual wire zones. Protocol protection allows
you to control which non-IP protocols are allowed (include) or denied
(exclude) between or within security zones on a Layer 2 VLAN or
virtual wire. Examples of non-IP protocols include AppleTalk, Banyan
VINES, Novell, NetBEUI, and Supervisory Control and Data Acquisition
(SCADA) systems such as Generic Object Oriented Substation Event
After you configure protocol protection in a Zone Protection
profile, apply the profile to an ingress security zone on a Layer
2 VLAN or virtual wire.
Enable Protocol Protection on internet-facing
zones to prevent layer 2 traffic from protocols you don’t use from
getting on your network.
Zone Protection Profile Settings—Protocol Protection
Specify the type of list you are creating
for protocol protection:
the protocols on the list are allowed—in addition to IPv4 (0x0800),
IPv6 (0x86DD), ARP (0x0806), and VLAN tagged frames (0x8100). All
other protocols are implicitly denied (blocked).
—Only the protocols on
the list are denied; all other protocols are implicitly allowed.
You cannot exclude IPv4 (0x0800), IPv6 (0x86DD), ARP (0x0806), or
VLAN tagged frames (0x8100).
the Include List to allow only the layer 2 protocols you use and
to deny all other protocols. This reduces the attack surface by
denying the protocols you don’t use on the network. The firewall
denies only the protocols that you add to the Exclude List and allows
all other protocols that are not on the list. If you don’t configure
Protocol Protection, all layer 2 protocols are allowed.
Enter the protocol name that corresponds
to the Ethertype code you are adding to the list. The firewall does
not verify that the protocol name matches the Ethertype code but the
Ethertype code does determine the protocol filter.
code on the list. If you want to disable a protocol for testing
purposes but not delete it, disable it, instead.
Enter an Ethertype code (protocol) preceded
by 0x to indicate hexadecimal (range is 0x0000 to 0xFFFF). A list
can have a maximum of 64 Ethertypes.