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© 2002, Cisco Systems, Inc. All rights reserved.
l2-security-bh.ppt
Normal CAM Behaviour 3/3
A->B
A->B
B Is on Port 2
I Do
Not
See
Traffic to B !
MAC A
MAC B
MAC C
Port 1
MAC
Port
A1
C3
MAC
Port
A1
C3
Port 2
Port 3
B2
B2
1
2
...
7
8
9
10
11
12
13
14
15
16
17
...
83
84
Hacking Layer 2: Fun with
1
Ethernet Switches
1
¥ Layer 2 Attack Landscape
2
¥ Summary and Case Study
2
The Domino Effect
5
The Numbers from CSI/FBI
7
MAC Attacks
8
MAC Address/CAM Table Review
9
Normal CAM Behaviour 1/3
10
Normal CAM Behaviour 2/3
11
Normal CAM Behaviour 3/3
12
CAM Overflow 1/3
13
CAM Overflow 2/3
14
CAM Overflow 3/3
15
Catalyst CAM Tables
16
CAM Table Full!
18
¥ Port Security
19
Port Security Details
20
VLAN ÒHoppingÓ Attacks
21
Trunk Port Refresher
22
0100.0ccc.cccc
24
Dynamic Trunk Protocol (DTP)
25
Basic VLAN Hopping Attack
26
Hopping Attack
27
Outer Tag, Attacker VLAN
28
Inner Tag, Victim VLAN
28
Disabling Auto-Trunking
29
Security Best Practices
30
ARP Attacks
31
ARP Refresher
32
Gratuitous ARP
33
Misuse of Gratuitous ARP
34
A Test in the Lab
35
¥ ARP spoofing
36
¥ MAC flooding
36
¥ Selective sniffing
36
¥ SSH/SSL interception
36
Arpspoof in Action
37
More on Arpspoof
38
Selective Sniffing
39
SSL/SSH Interception
40
Dsniff evolves: Ettercap
43
Can It Get Much Easier?
44
ARP Entries do not age out
46
Community Ports
46
Private VLAN Configuration
47
More ARP Spoof Mitigation
49
Spanning Tree Attacks
50
Spanning Tree Basics
51
STP Attack Mitigation
56
VLAN Trunking Protocol (VTP)
57
Potential VTP Attacks
58
Layer 2 Port Authentication
59
Dynamic VLAN Access Ports
60
VMPS Architecture
61
VMPS/VQP Attacks
62
VMPS/VQP Attack Mitigation
63
(TLS, MD5, OTP)
64
802.1X Port Authentication
65
Other Attacks
66
0100.0ccc.cccc
67
CDP Attacks
68
DHCP Starvation Attacks
69
Private VLAN Attacks 1/2
71
Private VLAN Attacks 2/2
72
PVLAN Attack Mitigation
73
Nice Try
74
Random Frame Stress Attack
75
IP Telephony Considerations
76
Switch Management
77
Summary and Case Study
78
Your Own Security Policy
80
A Relevant Case Study
81
A More Secure Alternative
82
Lessons Learned
83
Further Reading
84
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