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Does ICMP support redirect?
Routers use ICMP redirect messages to notify hosts that a more direct route exists for a destination.
How does ICMP redirect attack work?
Unlike ARP spoofing where the attacker pretends to be the target host in the hopes of getting frames re-directed to them on the LAN, ICMP redirect attacks modify the routing table of victim hosts, by misleading victims that they provide a better metric to the target destination outside the LAN.
What is ICMP attack?
An Internet Control Message Protocol (ICMP) flood DDoS attack, also known as a Ping flood attack, is a common Denial-of-Service (DoS) attack in which an attacker attempts to overwhelm a targeted device with ICMP echo-requests (pings).
What is the purpose of redirect in ICMP How is it implemented?
ICMP redirect messages are used by routers to notify the hosts on the data link that a better route is available for a particular destination. For example, the two routers R1 and R2 are connected to the same Ethernet segment as Host H. The default gateway for Host H is configured to use router R1.
How are ICMP redirects used in the network?
ICMP redirects are used by routers to specify better routing paths out of one network, based on the host choice, so basically it affects the way packets are routed and destinations. Through ICMP redirects, a host can find out which networks can be accessed from within the local network, and which are the routers to be used for each such network.
Can a ICMP packet be used to attack a network?
There are certain cases where ICMP packets can be used to attack a network. Although this type of problem is not common today, there are situations where such problems do happen. This is the case with ICMP redirect, or ICMP Type 5 packet.
When to send a redirect message to a host?
If G2 and the host identified by the internet source address of the datagram are on the same network, a redirect message is sent to the host. The redirect message advises the host to send its traffic for network X directly to gateway G2 as this is a shorter path to the destination.
How does ICMP redirect work in Cisco Nexus 7000?
When ICMP Redirects are enabled on Layer 3 interface and incoming data packet uses this interface both to ingress and egress Layer3 switch, ICMP Redirect message is generated. While Layer 3 packet forwarding is done in hardware on Cisco Nexus 7000 platform, it is still the responsibility of switch’s CPU to construct ICMP Redirect messages.