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Oracle SBC Security Guide
Appendix D: DDoS Prevention for Access or Hybrid Environments
Configuration Models:
The settings outlined in this appendix apply to the following configuration models:
PBRB
Policy Based Realm Bridging Model
SNB
SIP NAT Bridge Model
SSNHTN
Single SIP NAT Hosted in Trusted Network Model
Supported platforms:
Platform
CAM
Memory
NN 4250
64K
1Gb
NN 4250
256K
2Gb
NN 4500 (CPU1)
256K
3Gb
NN 4500 (CPU2)
256K
3Gb
NN 3820
128K
3Gb
NN 6300
724k
16Gb
Configuration Parameters
The maximum signaling bandwidth per platform should be set to keep the CPU usage below 90%.
The following sections will discuss those “DDoS” parameter pertinent to the scope of this appendix. It’s
important to note: the parameters used to satisfy the requirements and scope of this appendix cannot be
considered to be exhaustive. The parameters used are those which will be modified for this basic
configuration. These parameters are in three configuration areas: Media Manager, Realm Configuration,
and SIP Interface.
DDoS Configuration Parameter Descriptions
Media Manager
The following media-manager parameters have been calculated for each configuration model.
Parameter
Value
max-untrusted-signaling
Maximum percentage of allocated total CPU usage
for untrusted traffic (%)
min-untrusted-signaling
Minimum percentage of allocated total CPU usage
for untrusted traffic (%)
max-signaling-bandwidth
The maximum bandwidth that the SBC can
withstand (bytes/sec)
These parameters are set to values that do not allow a SIP Register flood attack to increase the total CPU
utilization percentage to over 89%. The background trusted traffic must not be adversely affected.
The recommended values for these media-manager parameters for each test scenario are listed by system
model.
- SECURITY GUIDE 1
- Contents 3
- Related Documentation 7
- Part 1: Overview 8
- Figure 1: Net-SAFE Framework 9
- General Security Principles 10
- Monitor System Activity 11
- Session Border Controller 13
- Unified Session Manager 14
- Core Session Manager 15
- Session Router 16
- Realm Design Considerations 16
- Management Interfaces 17
- Passwords 18
- Boot Flags 18
- System ACLs 19
- Telnet/SSH 19
- FTP/SFTP 19
- GUI Management 19
- Resiliency 20
- Physical Link Redundancy 21
- Part 3: Security Features 22
- Security Specific Licenses 24
- Features 26
- Configuring AAA Integration 27
- SIP Interface Security 28
- Service ACLs 29
- TLS for SIP 31
- IPsec for SIP 33
- Call Admission Control (CAC) 34
- Media Policing 35
- DoS/DDoS Prevention 35
- Attack Tool Prevention 36
- Lawful Interception 36
- Part 4: Appendices 37
- Appendix B: Port Matrix 38
- Configuration Models: 40
- Supported platforms 40
- Configuration Parameters 40
- Realm Configuration 41
- SIP Interface 41
- Observations/Limitations 49
- Overview 61
- Deployment Archetypes 61
- Scanner Mitigation 63
- Peering Environments 68
- IDS License Details 70
- Dependencies 70
- Statistics 71
- SNMP MIB OIDS 71
- SNMP Traps 72
- Constraints Limiting 75
- Session-Constraints 75
- Rate constraints 76
- Message Rejections 78
- SNMP support 79
- Log Action 79
- Blacklist Table Maintentance 86
- SNMP OIDs 88
- System Management Statistics 88
- Realm Statistics 89
- Environmental Statistics 90
- Enterprise SNMP Traps 90
- SNMP Traps in HA environment 93
- Appendix I: Syslog 94
- Call Detail Records (CDR) 102
- Oracle SBC Security Guide 103
- System Statistics 106
- Application Statistics 106
- Introduction 108
- SRTP Topologies 108
- Requirements 110
- Design Aspects 111
- Secured/Unsecured Network 114
- Troubleshooting 122
- References 142
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