Ip source guard
Category : Ip source guard
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These threats result from weaknesses in Layer 2 of the OSI model—the data-link layer. Switches act as arbiters to forward and control all the data flowing across the network.
The current trend is for network security to be solidified through the support of switch security features that build feature-rich, high-performance, and optimized networks.
Understanding IP Source Guard for Port Security on Switches
The chapter examines the integrated security features available on Cisco catalyst switches to mitigate threats that result from the weaknesses in Layer 2 of the OSI model. The chapter also provides guidelines and recommendations intended to help you understand and configure the Layer 2 security features available on Cisco switches to build robust networks.
With the rapid growth of IP networks in the past years, high-end switching has played one of the most fundamental and essential roles in moving data reliably, efficiently, and securely across networks. Cisco Catalyst switches are the leader in the switching market and major players in today's networks. The data-link layer Layer 2 of the OSI model provides the functional and procedural means to transfer data between network entities with interoperability and interconnectivity to other layers, but from a security perspective, the data-link layer presents its own challenges.
Security Features on Switches
Network security is only as strong as the weakest link, and Layer 2 is no exception. Applying first-class security measures to the upper layers Layers 3 and higher does not benefit your network if Layer 2 is compromised. Cisco switches offer a wide range of security features at Layer 2 to protect the network traffic flow and the devices themselves.
Understanding and preparing for network threats is important, and hardening Layer 2 is becoming imperative.
Cisco is continuously raising the bar for security, and security feature availability at Layer 2 is no exception. The sections that follow highlight the Layer 2 security features available on Cisco Catalyst switches. The configuration examples shown in this chapter are based on Cisco IOS Software syntax only also known as native mode. See All Related Articles.
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Home Shop By Cert New! Sample Chapter is provided courtesy of Cisco Press. Date: Jul 4, The port security functionality will be configured as part of the port level security configuration. This profile can be attached to the interface.Calori specifici
RA Router Advertisement. The RA messages are sent by the routers in the network when the hosts send multicast router solicitation to the multicast address of all routers. Guard functionality can be enabled at the port level. Configure the RA guard as part of the port level security configuration and attach to the interface.
A network protocol that enables a server to automatically assign an IP address to an IP-enabled device from a defined range of numbers configured for a given network. DHCP Trust can be enabled on any interface.
When no trust dhcp is configured the DHCP packets are dropped and a message is logged. Port Loop Protect functionality is configured as part of the port level security configuration.
You can attach the port-security profile to any Layer 2 interface. Enabling Loop Protect will disable a port when it detects a loop. You can automatically re-enable the port by setting the auto-recovery option.
Otherwise, you can recover the port manually using the clear command. A console interface with a command line shell that allows users to execute text input as commands and convert these commands to appropriate functions. Set a value for auto-recovery-time to enable the auto-recovery option.
The port automatically re-enables and recovers from the error after the specified time. By default, auto-recovery is disabled.
Auto-recovery remains disabled, if you enable loop-protect without setting the auto-recovery-time option or by setting the value to 0. It is recommended that you disable Spanning Tree using the following command before enabling Loop Protect on an interface: host config spanning-tree no mode Otherwise, you will see the following warning message: Warning: Port Loop Protect configured in the port-security-profile, will be inactive.
A MAC address is a unique identifier assigned to network interfaces for communications on a network. Limit functionality will be configured as part of the port level security configuration. You can attach this profile to an interface.
The maximum value for auto-recovery-time for all the port security functionalities is 65, seconds. You can apply auto-recovery-time option only if the action is shutdown.Arista Networks, Inc. If you click accept, you indicate that you consent to receive cookies from our website.
The IPSG configuration on port channels supersedes the configuration on the physical member ports. Hence, source IP MAC binding entries should be configured on port channels using the ip source binding command. When configured on a port channel member port, IPSG does not take effect until this port is deleted from the port channel configuration.
This command verifies the IPSG configuration and operational states. This command displays all VLANs configured in no ip verify source vlan. Hardware programming errors, e. A source binding entry is considered active if it is programmed in hardware. IP traffic matching any active binding entry will be permitted. Chapter PDF. X Arista Networks, Inc.If the user later puts a different static IP address, then that traffic will be dropped.
Note: 1. L-2 traffic ARP etc will still be allowed through. IPSG can only drop L-3 traffic. It should only be enabled on Downstream ports which connect to end devices. Welcome Back! Select your Aruba account from the following: Aruba Central Login to your cloud management instance. Partner Ready for Networking Login to access partner sales tools and resources.
Airheads Community Login to connect, learn, and engage with other peers and experts. What is IP Source Guard and how to enable it? AnandKumar Sukumar Aruba Employee. Version history. Revision :.
Last update:. Updated by:. AnandKumar Sukumar. View article history. Labels 3. AnandKumar Suk. Was this article helpful? Yes No. Thanks and regards, Ashok Kumar Sunkara.
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Did you mean:.This is to be expected, as IP source guard relies on a switch's knowledge of DHCP-assigned host addresses in order to validate and restrict spoofed source addresses. However, IP source guard can be implemented independent of DHCP, a useful ability on networks or subnets using only static addressing. IP source guard references this database when a packet is received on any of these interfaces and compares the source address to the assigned address listed in the database.
If the source address differs from the "allowed" address, the packet is assumed to spoofed and is discarded. Assuming DHCP isn't available or in use on a subnet, static IP bindings can be manually configured per access port to achieve the same effect. The following topology illustrates the lab on which this is being demonstrated. Note that for the purposes of the lab, IP source guard has only been enabled on the two relevant access ports. In a real-world deployment, IP source guard should be enabled consistently across all access ports.
The next step isn't immediately obvious, and in fact a bit counter-intuitive: enabling DHCP snooping. Despite our reliance solely on static bindings in this lab, the DHCP snooping feature must be turned on to enable the inspection of incoming packets. Next we'll define the static IP source address bindings, under global configuration.
Note that this also requires the source MAC address, which can be obtained from the switch's CAM table if not already known. The above output displays the bindings active in the database. However, to inspect the actual operation of IP source guard, the command show ip verify source is used:.
If Filter-mode above lists inactive-no-snooping-vlan for any entry, DHCP snooping has not been enabled for that VLAN which I totally already knew and wasn't at all a mistake I made in developing this lab. To verify that IP source guard is blocking spoofed traffic, we'll need to craft a custom packet. Scapy is a great tool for this:. The above command in the scapy interpreter sends an ICMP echo request to Although we're obviously unable to test for a response to this ping even if it got through, the reply would be to 1.
IP Source Guard is typically used to prevent users from setting a static IP address on their machine. This scenario doesn't seem to gain anything more than port security which is a lot less complexsince you need the MAC address for this method anyway.
IPv6Freely: In my opinion, the biggest advantage is mitigation of DDoS attacks, in which packets are typically sent from random source addresses to deter administrative filtering by the victim. Of course it's expected that an enterprise will only allow valid-sourced traffic out at the edge, but that does nothing to prevent internal attacks. IP source guard also prevents a malicious host from simply masquerading as another, such as a DNS server.
To me it seems that source guard is a mitigation of man-in-the-middle more than DOS attack. An attacker could try to become. I suppose. I just can't see ever using this in production. Maybe someone has a use for it, though Switch config ip source binding d. Thanks for pointing out the error, I've corrected the article.
Any news from Cisco on that? We were looking at implementing DHCP Snooping but some of the other guys on the team were concerned about the size of the binding table and what kind of performance if any depredation there was.
The size of the binding table was never really an issue. The number of entries should be roughly equivalent to your port density.
A couple of months ago I was called in to assist a client who had been hit with a virus that spoofed their default gateway.Control systems multiple choice questions pdf
They have a flat network with over nodes.You can also configure a static binding instead of using DHCP. Source guard is not a standalone tool. It relies on the information in the DHCP snooping database to do its work.
You can only use this on layer two access and trunk interfaces and it only works inbound. To enable this, you only need a single command:.
SW1 now only permits source IP address We can also check the source MAC address though. IP source guard uses port-security for this. The MAC address now shows up in the table:. What about that server? Fortunately, we can create a static binding.
Explained As Simple As Possible. Full Access to our Lessons. More Lessons Added Every Week! I configured the switch port for voice and data vlans. I was trying to use IP source guard for this port but it was failing. I configured static binding for the IP phone and it was working. Any suggestion to solve this issue without using the static binding?
Wired Intelligent Edge (Campus Switching and Routing)
Take a look at the following documentation from Cisco:. It does not work while you wanna check the source MAC address. Specifically, these can be found at this Cisco Documentation. Ask a question or join the discussion by visiting our Community Forum. Skip to content Search for: Search. You can also confi. Configurations Want to take a look for yourself?
Here you will find the startup configuration of each device. You may cancel your monthly membership at any time.Mongoloid face
No Questions Asked! Forum Replies I configured the switch port for voice and data vlans. Continue reading in our forum. Look especially at steps 5 through 7 in the procedure described. It works like a protection redundancy.
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