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1 Cisco Systems Korea 2008 Cisco Systems, Inc. All rights reserved. 1
2 (Cisco Integrated Security Features) - Port Security - DHCP Snooping - Dynamic ARP Inspection - IP Source Guard - Traffic Storm Control -CoPP Cisco TrustSec (CTS) ; Why Cisco 2008 Cisco Systems, Inc. All rights reserved. 2
3 2008 Cisco Systems, Inc. All rights reserved. 3
4 =,, 2 Application Presentation Session POP3, IMAP, IM, SSL, SSH Application Presentation Session Transport Protocols/Ports Transport Network IP Addresses Network Data Link Data Link Physical Physical Links Physical 2008 Cisco Systems, Inc. All rights reserved. 4
5 2? VLAN? VLAN? VLAN VLAN? VLAN? Layer 2? VLAN Layer 3???? 2008 Cisco Systems, Inc. All rights reserved. 5
6 UC (Web 2.0) Si Si Si Si Si Si Peer-to-Peer Si Si Si Si Application 2008 Cisco Systems, Inc. All rights reserved. 6
7 CSI Computer Crime & Security * CSI Survey Cisco Systems, Inc. All rights reserved. 7
8 (Cisco Integrated Security Features) - Port Security - DHCP Snooping - Dynamic ARP Inspection - IP Source Guard - Traffic Storm Control 2008 Cisco Systems, Inc. All rights reserved. 8
9 2MAC - Macof/dsniff - NIC / DHCP - Gobbler - / DHCP ARP - IDC / / ARP flooding -STP Cisco Systems, Inc. All rights reserved. 9
10 MAC = Port Security 00:0e:00:aa:aa:aa 00:0e:00:bb:bb:bb 3 MAC 132,000 Bogus MACs MAC MAC, SNMP NMS 2008 Cisco Systems, Inc. All rights reserved. 10
11 DHCP DHCP Client DHCP Discover (Broadcast) DHCP Offer (Unicast) DHCP Request (Broadcast) DHCP Ack k(unicast) 2008 Cisco Systems, Inc. All rights reserved. 11
12 DHCP = Port Security Client DHCP lease MAC MAC DHCP CatOS set port security 5/1 enable set port security 5/1 port max 1 set port security 5/1 violation restrict set port security 5/1 age 2 set port security 5/1 timer type inactivity IOS, switchport port security 1 switchport port security maximum 1 DHCP switchport port security violation restrict switchport port security aging time 2 switchport port security aging type inactivity 2008 Cisco Systems, Inc. All rights reserved. 12
13 / DHCP = DHCP Snooping Client Untrusted DHCP Snooping Trusted Untrusted OK DHCP Responses: offer, ack, nak DHCP BAD DHCP Responses: offer, ack, nak DHCP Snooping Binding show ip dhcp snooping binding MacAddress IpAddress Lease(sec) Type VLAN Interface :03:47:B5:9F:AD dhcp-snooping 4 FastEthernet3/18 t3/ Cisco Systems, Inc. All rights reserved. 13
14 ARP (Man-in-themiddle of attack) MAC A Is Now MAC C Transmit/Receive Traffic to MAC C Transmit/Receive Traffic to MAC C MAC C MAC B Is Now MAC C 2008 Cisco Systems, Inc. All rights reserved. 14
15 ARP : Dynamic ARP Inspection ARP Saying is MAC C DHCP Snooping Binding Dynamic ARP Inspection None ARP IP/MAC Matching Binding ARP s in the MAC A Bit Bucket, bit bucket Is this in my Binding NO! Table? DHCP Snooping + Dynamic ARP inspection MAC B MAC C ARP Saying is MAC C 2008 Cisco Systems, Inc. All rights reserved. 15
16 MAC Traffic Sent with MAC B Source Received Traffic Source Address Mac B MAC A MAC MAC Layer 2, MAC C MAC B 2008 Cisco Systems, Inc. All rights reserved. 16
17 IP Traffic Sent with IP Source Received Traffic Source IP Mac C MAC A IP IP MAC C MAC B 2008 Cisco Systems, Inc. All rights reserved. 17
18 IP/MAC : IP Source Guard Traffic Sent with IP Mac B Non Is Matching this in my Binding NO! Traffic Table? Dropped MAC A DHCP Snooping Binding IP Source Guard Dynamic ARP Inspection (DAI) DAI ARP, IP Source Guard DHCP Snooping Dynamic ARP inspection IP Source Guard MAC C Received Traffic Source IP Mac B Traffic Sent with IP Mac C MAC B 2008 Cisco Systems, Inc. All rights reserved. 18
19 Traffic Storm Control Flooding DoS Packets Dropped Traffic Storm = VLAN flooding Broadcast, multicast, unicast flooding ) STP, 0 T1 T2 T3! Storm control storm-control broadcast level 1.0 storm-control multicast level Cisco Systems, Inc. All rights reserved. 19
20 Building the Layers Port Security Port security: MAC flooding DHCP DHCP Snooping: / DHCP Dynamic ARP Inspection: ARP IP source guard: IP/MAC Traffic Storm Control: Flooding DoS 2008 Cisco Systems, Inc. All rights reserved. 20
21 : CoPP (Control Plane Policing) 2008 Cisco Systems, Inc. All rights reserved. 21
22 Control Plane Control Plane MGMT SNMP, Telnet ICMP Routing Updates Logging ARP IP Options Arriving packets CONTROL PLANE DATA PLANE CPU - Routing neighbor - - STP / - HSRP - Logging - ARP - CLI - Switch Hang Cisco Systems, Inc. All rights reserved. 22
23 CoPP Control Plane Policing (CoPP) : Data Plane Control Plane, Control Plane Control Plane CONTROL PLANE CONTROL PLANE INTERFACE DATA PLANE Linecard Linecard Switch(config)#control plane Switch(config cp)#service policy input <name> : the control-plane interface QoS (MQC) config DoS 2008 Cisco Systems, Inc. All rights reserved. 23
24 Cisco TrustSec 2008 Cisco Systems, Inc. All rights reserved. 24
25 Security and Compliance Driving Need for Increased Security with Pervasive Identity New and Changing Regulations Mobility and Uniformity of Experience Consistent Service Delivery Customer and Partner Interactions 2008 Cisco Systems, Inc. All rights reserved. 25
26 Cisco TrustSec (CTS) Cisco TrustSec (CTS)? Topology-aware Role-aware 1 Role-aware & 2 Framework 3 Hop-by-hop 2008 Cisco Systems, Inc. All rights reserved. 26
27 CTS: SGACL Employee E C CRM Partner P G U I Internet Guest Process Authorization Rules Cisco ACS Verify Identity Credentials and Obtain Additional Attributes Legend Link/Port Status Unauthenticated Failed Authentication Authenticated Shutdown Ingress Tagging Egress Filtering Security Group Classifications E Employee Group C Confidential Group P Partner Group U Unrestricted Group G Guest Group I Internet Group Radius / AD SGACL Cisco Systems, Inc. All rights reserved. 27
28 Cisco TrustSec : Link Layer Encryption IEEE 802.1ae Hop-by-Hop p / Bump-in-the-wire packet inspection (NetFlow, CISF, IDS) TrustSec /802.1 AE Encrypted In the Clear Cipher Data In the Clear TrustSec /802.1 AE Encrypted Cipher Data TrustSec /802.1 AE Encrypted Decrypt On Ingress Interface Encrypt On Egress Interface Decrypt Encrypt 2008 Cisco Systems, Inc. All rights reserved. 28
29 ; Why Cisco 2008 Cisco Systems, Inc. All rights reserved. 29
30 ; Why Cisco Netflow System Under Attack Si Si Si Si Core Cisco TrustSec Si Access Infected Source Cisco Security Agent Si Distribution Access End-To-End QoS Scavenger Class RACL/PBACL Storm Control IP Source Guard/uRPF NetFlow Rate Limiters CoPP NAC and IBNS PACLs CISF PISA FPM & NBAR NetFlow 2008 Cisco Systems, Inc. All rights reserved. 30
31 2008 Cisco Systems, Inc. All rights reserved. 31
32 Layer 2 Best Practices (1/2) (SSH, Out Of Band, permit lists,.) trunk VLAN ID Be paranoid: VLAN1! non trunking (Cisco IPT, Voice + Data VLAN) Port-Security SNMP community ARP (ARP inspection, IDS/IPS,.) 2008 Cisco Systems, Inc. All rights reserved. 32
33 Layer 2 Best Practices (2/2) STP (BPDU Guard, Root Guard, Loop Guard ) DHCP (DHCP Snooping, VACLs) VTP transparent ; MD5 CDP enable (IPT,, ), VLAN Best Practice!!! 2008 Cisco Systems, Inc. All rights reserved. 33
34 Matrix for Security Features (1/3) Feature/Platform Nexus 7K NXOS 6500/ Catalyst OS 6500/Cisco IOS 4500/Cisco IOS Dynamic Port Security (1) 12.1(13)E1(13)E 12.1(13)EW1(13)EW DHCP Snooping (1) 12.2(18)SXE 12.1(12c)EW ** DAI (1) 12.2(18)SXE 12.1(19)EW ** IP Source Guard (1)* 12.2(18)SXD22(18)SXD2 12.1(19)EW ** CoPP 4.0 N/A 12.2(18)SXD1 12.2(31)SG * Sup720 ** Sup2+ Supervisor 2008 Cisco Systems, Inc. All rights reserved. 34
35 Matrix for Security Features (2/3) Feature/Platform 3750/3560 EMI 3550 EMI 2960 EI 2950 EI 2950 SI Dynamic Port Security 12.1(25)SE 12.2(25)SEA 12.1(11)AX 12.0(5.2)WC1 12.0(5.2) WC1 DHCP Snooping 12.1(25)SE1(25)SE 12.2(25)SEA2(25)SEA 12.1(19)EA11(19)EA1 12.1(19)EA11(19)EA1 N/A DAI 12.2(25)SE 12.2(25)SEA N/A N/A N/A IP Source Guard 12.2(25)SE 12.2(25)SEA N/A N/A N/A Note: Old Names of the IOS for the 3000 Series Switches IOS Feature Finder Cisco Systems, Inc. All rights reserved. 35
36 Matrix for Security Features (3/3) Feature/ Platform 3750/3560 Advance IP 3550 Advanced IP 3750/3560 IP Base 3550 IP Base Dynamic Port Security 12.1(25)SE 12.2(25)SEA 12.1(25)SE 12.2(25)SEA DHCP Snooping 12.1(25)SE 12.1(25)SEA 12.1(25)SE 12.1(25)SEA DAI 12.2(25)SE 12.2(25)SEA 12.2(25)SE 12.2(25)SEA IP Source Guard 12.2(25)SE 12.2(25)SEA 12.1(25)SE 12.2(25)SEA Note: Name Change of the IOS on the 3000 Series Switches IOS Feature Finder Cisco Systems, Inc. All rights reserved. 36
37 2008 Cisco Systems, Inc. All rights reserved. 37
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