- What is the relationship between IP and ICMP?
- Where is ICMP protocol used?
- What port is used for ICMP ping?
- Can you have zero ping?
- Is ICMP a Layer 3?
- Can ICMP be blocked?
- Is a higher ping better?
- How does ping use ICMP?
- What happens if ICMP is disabled?
- What is ICMP attack?
- Should I enable ICMP?
- What ICMP types should I allow?
- How do I enable ICMP?
- What layer is ARP?
- What are the two types of ICMP messages?
What is the relationship between IP and ICMP?
ICMP packets occupy the data portion of an IP packet while being transported over the Internet.
Although ICMP messages are carried by IP, ICMP is regarded to be at the same level as IP, the network layer level..
Where is ICMP protocol used?
ICMP is used by a device, like a router, to communicate with the source of a data packet about transmission issues. For example, if a datagram is not delivered, ICMP might report this back to the host with details to help discern where the transmission went wrong.
What port is used for ICMP ping?
ICMP has no ports and is neither TCP nor UDP. ICMP is IP protocol 1 (see RFC792), TCP is IP protocol 6 (described in RFC793) and UDP is IP protocol 17(see RFC768). UDP and TCP have ports, ICMP has no ports, but types and codes.
Can you have zero ping?
In this case, you’ll often see a ping of “<1ms," which is essentially zero. This simply means that your computer can communicate with itself instantly. ... However, it's so low that we can round it down to 0ms and say we have a zero ping to our own computer.
Is ICMP a Layer 3?
So ICMP processing can be viewed as occurring parallel to, or as part of, IP processing. Therefore, in the topic on TCP/IP-based layered network, ICMP is shown as a layer 3 protocol. ICMP is probably most well known as the message protocol used for the command.
Can ICMP be blocked?
Because ICMP can also be used by a potential adversary to perform reconnaissance against a target network, and due to historical denial-of-service bugs in broken implementations of ICMP, some network administrators block all ICMP traffic as a network hardening measure.
Is a higher ping better?
A result below 100 ms should be expected from any decent broadband connection. Ping is the measure of latency (lag) from your computer to the server and back to your computer. … Lower ping is better than higher ping because it means that you will send information and receive the server’s response back quicker.
How does ping use ICMP?
The name comes from active sonar terminology that sends a pulse of sound and listens for the echo to detect objects under water. Ping operates by sending Internet Control Message Protocol (ICMP) echo request packets to the target host and waiting for an ICMP echo reply.
What happens if ICMP is disabled?
Disabling ICMP can cause network issues If Path MTU Discovery is unable to function, excessively large packets may be transmitted without fragmentation and will fail to reach the destination. This will lead to a retransmission loop with the same MTU only to be dropped again and again.
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).
Should I enable ICMP?
The Problem. Many network administrators feel that ICMP is a security risk, and should therefore always be blocked at the firewall. It is true that ICMP does have some security issues associated with it, and that a lot of ICMP should be blocked. But this is no reason to block all ICMP traffic!
What ICMP types should I allow?
The only essential ICMP traffic you need to allow in and out of your firewall is Type 3 and Type 4. Everything else is either optional or should be blocked. Notes: To send ping requests, allow type 8 OUT and type 0 IN.
How do I enable ICMP?
How to Enable ICMP (PING) through the Windows Firewall with Advanced Security using Group PolicyCheck the Custom radio button and click Next.Check the All Programs radio button and click Next.From the Protocol Type: drop down list select ICMPv4 and click Customize…Check the All ICMP types radio botton and click OK.More items…
What layer is ARP?
ARP works between network layers 2 and 3 of the Open Systems Interconnection model (OSI model). The MAC address exists on layer 2 of the OSI model, the data link layer, while the IP address exists on layer 3, the network layer.
What are the two types of ICMP messages?
Internet Control Message Protocol (ICMP) ParametersType 0 — Echo Reply.Type 1 — Unassigned.Type 2 — Unassigned.Type 3 — Destination Unreachable.Type 4 — Source Quench (Deprecated)Type 5 — Redirect.Type 6 — Alternate Host Address (Deprecated)Type 7 — Unassigned.More items…•