Configure 5G Network Slice Security

Enable GTP security.
Select
Device
Setup
Management
General Settings
. Select
GTP Security
.
Click
OK
.
Commit
the change.
Select
Device
Setup
Operations
and
Reboot Device
.
Enable inspection of 5G HTTP/2 control packets; create a Mobile Network Protection profile.
Select
Objects
Security Profiles
Mobile Network Protection
.
Add
a profile by
Name
, for example, 5G Mobile security.
Enter a
Description
.
On the
GTP Inspection
tab, select
5G-C
.
Enable
5G-HTTP2
to enable inspection of 5G HTTP/2 control packets.

Select
GTP-U
and enable
GTP-U Content Inspection
to correlate context from 5G HTTP/2 control packets (Subscriber IDs and Equipment IDs) to IP user traffic inside a GTP-U tunnel.
Select
Filtering Options
and
RAT Filtering
; for example, you can allow
NR
(New Radio) and block other RATs.

Select
IMSI Filtering
and
Add
one or more
IMSI Prefix
(es) with the desired action.
Select
APN Filtering
and
Add
one or more
APN
s with the desired action.
(
Optional
) To troubleshoot, select
Other Log Settings
and select 5G Allowed Messages
N11
(the HTTP/2 control messages). You can also enable GTP-U Allowed Messages for
Tunnel Management
,
Path Management
, and
G-PDU
. You can
Log User Location
.
Click
OK
.
Create address objects for the IP addresses assigned to the network elements in your topology, such as the AMF on the N11 interface, the gNB on the N3 interface, the SMF on the N11 interface, and the UPF on the N3 interface.
Create a Security policy rule that applies your Mobile Network Protection profile to application traffic.
Select
Policies
Security
and
Add
a Security policy rule by
Name
.
Select
Source
tab and
Add
a
Source Zone
or select
Any
.
For
Source Address
,
Add
the address objects for the 5G element endpoints on the N3 and N11 interfaces that you want to allow.

For
Destination
,
Add
the
Destination Address
address objects for the 5G element endpoints on the N3 and N11 interfaces that you want to allow (the same ones you allowed for Source Address).
Add
the
Applications
to allow, such as the user plane, which is
gtp-u
and
web-browsing
, which has HTTP/2.
On the
Actions
tab, select the
Action
, such as
Allow
.
Select the
Mobile Network Protection
profile you created.
Select other profiles you want to apply, such as
Vulnerability Protection
.
Select Log Settings, such as
Log at Session Start
and
Log at Session End
.
Click
OK
.
Create another Security policy rule based on Network Slices, for example, to allow applications for a standardized or operator-specific SST.
Select
Policies
Security
and
Add
a Security policy rule by
Name
.
Select
Source
and
Add
one or more
Network Slices
in either of the following formats:
Standardized SST (select
eMBB
,
MIoT
, or
URLLC
).
Operator-specific SSTs in the format of
text,number
(number range is 128 to 255, in decimal). (The number appears in hexadecimal in logs.)

(
Optional
) You can add
Source Subscriber
and
Source Equipment
names to this Security policy rule to make the rule more restrictive.
Specify
Source Zone
,
Source Address
,
Source User
, and
Source Device
, or use the default
Any
setting for each.
Specify
Destination Zone
,
Destination Address
, and
Destination Device
, or use the default
Any
setting for each.
For
Applications
, select, for example,
modbus
and
web-browsing
.
On the
Actions
tab, select the
Action
, such as
Allow
.
Select profiles you want to apply, such as
Antivirus
,
Vulnerability Protection
,
Anti-Spyware
,
URL Filtering
,
File Blocking
, and
WildFire Analysis
.
Select Log Settings, such as
Log at Session Start
and
Log at Session End
.
Click
OK
.
Commit
.