Sticky secure MAC addresses: You can configure a port to dynamically learn MAC addresses and then save these MAC addresses to the running configuration.MAC addresses configured in this way are removed after restart. Dynamic secure MAC addresses: MAC addresses are dynamically learned by this system and stored in the address table.MAC addresses configured in this way are stored in the address table and are added to the running configuration on the switch. Switch1(config-if)#switchport port-security mac-address 01:23:46:68:88:AB Switch1(config)#interface FastEthernet 0/1 Static secure MAC addresses:MAC addresses are manually configured on the switch simply by using configuration command:.Now we will see what’s the difference and how you can configure port security on a Cisco switch: This means that there is three ways to configure port security. There are three different types of Secure MAC addresses. If a port is configured as a secure port and the maximum number of secure MAC addresses is reached, a security violation occurs when the MAC address of a machine attempting to access the port is different from any of the identified secure MAC addresses.
Cisco mac address security full#
If you limit the number of secure MAC addresses to one address and assign a single secure MAC address to that port, the machine attached to that port is assured the full bandwidth of the port, and only that machine with that particular secure MAC address can successfully connect to that switch port. In other words, you decide which machines with which specific MAC addresses can access the switch. When you assign secure MAC addresses to a secure port, the switch will not accept connections from machines that have different source MAC address from MAC addresses configured by you as secure MAC addresses. Port security reduces the number of valid MAC addresses allowed on a port. An attacker could collect traffic that contains all user data and private information, passwords or configuration information about the machines on the network.Īll switch ports or interfaces should have switch port security enabled before the switch is deployed into the real world use. In this case every system connected to the switch can potentially view all network traffic passing through the switch to all systems connected to the switch. On the switch that is not protected we can expect that attacker will easily perform a MAC address flooding attack in which a switch can be configured to act like a hub. Switch Security Attacks – Layer 2 SecurityĪ switch that does not provide port security allows an attacker to attach a system to an unused, enabled port and to perform information gathering or attacks.VoIP Security – Main Targets of VoIP Attacks.Attack on SIP protocol – VoIP Vulnerability.Vishing and Toll Fraud – VoIP Vulnerability.Implement Auxiliary VLANs to make VoIP Networks secure.Protecting a VoIP Network with Security Appliances.
DoS and DDoS – Denial of Service attacks.DDoS – Distributed Denial of Service attack.DoS Methods – ICMP and SYN flood, Teardrop and Low-rate DoS attacks.DoS Methods – PDoS, Permanent DoS attacks.Unidirectional communication filter between two VLANs.Source-based routing in IPv4 and IPv6 networks.What is the difference between tunnel | transport mode in IPsec.
Cisco mac address security how to#
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