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What is ICMP redirection enabled?
By default, many systems enable a feature called ICMP redirection, where the machine will alter its route table in response to an ICMP redirect message from any network device.
What is true about ICMP?
The Internet Control Message Protocol (ICMP) is a network layer protocol used by network devices to diagnose network communication issues. ICMP is mainly used to determine whether or not data is reaching its intended destination in a timely manner.
Which statement is not true ICMP?
Explanation: ICMP does NOT provide reliable transmission of data in an Internet Protocol (IP) environment.
Where does the ICMP redirect message go to?
The gateway, L3 Switch, checks its routing table and obtains the address 10.0.0.2 of the next gateway, G2, on the route to data packet’s destination network, X. 3. If G2 and the host identified by the source address of IP packet are on the same network, ICMP Redirect message is sent to the host.
Is the ICMP protocol dangerous to the network?
However, ICMP is also dangerous. Hackers can use it to map and attack networks, so it needs to be restricted. Like TCP and UDP, ICMP is a protocol within TCP/IP that runs over IP.
Why do I need to disable ICMP on my router?
Without getting into vendor specifics, disable IP-directed broadcasts to all of your routers to keep your network healthy. Letting traceroute, ping, or any of the other ICMP messages into and through your network from the Internet is an invitation for network mapping, and it could lead to an attack.
How does an attacker send a forged ICMP message?
ICMP packet magnification (or ICMP Smurf): An attacker sends forged ICMP echo packets to vulnerable networks’ broadcast addresses. All the systems on those networks send ICMP echo replies to the victim, consuming the target system’s available bandwidth and creating a denial of service (DoS) to legitimate traffic.