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The default number of known secure MAC addresses is one. Sticky MAC addresses ("switchport port-security mac-address sticky") will allow us to enter dynamically learned MAC addresses to running config. We can do this by either hardcoding the MAC addresses of known devices (statically define the known MAC addresses) or configure "sticky" MAC Address. OmniSecuSW1(config-if)#switchport port-security maximum ?ģ) Define the MAC Addresses of known devices, which are going to access the network via that interface. Remember, it is possible that more that one genuine devices are connected to a switch interface (Example: a phone and a computer). OmniSecuSW1(config-if)#switchport port-securityĢ) Specify a maximum number of MAC addresses allowed on that interface.
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"switchport port-security" (at interface configuration mode) command can be used to enables Port Security. This goal is achieved by the following settings, which are related with a switch interface.ġ) Enable Port Security Feature. The goal of Port Security is to prevent a network attacker from sending large number of Ethernet Frames with forged fake source MAC addresses to a Switch interface.
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Port security feature is meant for access ports and it will not work on trunk ports, Ether-channel ports or SPAN (Switch Port Analyzer) ports. DHCP starvation attacks can result in depletion of available IP addresses in DHCP Server scope. Port security feature can also protect the switch from DHCP starvation attacks, where a client start flooding the network with very large number of DHCP requests, each using a different source MAC address. Port Security feature can protect the switch from MAC flooding attacks.
#What is mac address flooding for mac
MAC flooding attack can soon drain the memory resources allocated for MAC address table and later the switch will start behaving like a network Hub. MAC address flooding attack (CAM table flooding attack) is a type of network attack where an attacker connected to a switch port floods the switch interface with very large number of Ethernet frames with different fake source MAC address. It does not store any personal data.Before continuing, visit the following link to learn more about MAC flooding attack The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. The cookie is used to store the user consent for the cookies in the category "Performance". This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Other. The cookies is used to store the user consent for the cookies in the category "Necessary". The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional".
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The cookie is used to store the user consent for the cookies in the category "Analytics". These cookies ensure basic functionalities and security features of the website, anonymously. Necessary cookies are absolutely essential for the website to function properly. Enable or disable IGMP snooping by clicking the slider in the IGMP Snooping section. How do I block IGMP?įrom the menu at the top of the page, select ADVANCED SETTINGS. Figure 2 Switch Floods Traffic Sourced from PC-A to PC-D to All Interfaces. If this flooding is happening for unicast frames, network performance might be affected. What is VLAN flooding?įlooding to all ports in a VLAN always occurs for broadcast frames. In this case the switch marks the frame for flooding and sends it to all forwarding ports within the respective VLAN. Unknown-unicast traffic happens when a switch receives unicast traffic intended to be delivered to a destination that is not in its forwarding information base. Devices other than switches may create unicast floods as well. For example, set the MAC timeout to 360 seconds and the ARP timeout to 300 seconds. The solution to prevent this is to have the switch configured with a MAC address timeout longer than the ARP timeout.