2020年12月29日 · Is there any relation between ICMP with TCP. Not directly. ICMP is IP protocol 1, TCP is IP protocol 6. Other common IP protocols are 17 (udp) and 47 (gre). In other can we guaranty their arrival in the network. Typically ICMP is not sent within any type of framework that uses acknowledgements and timeouts like TCP does. So the answer here is no.

2016年2月23日 · The best known example of ICMP in practice is the ping utility, that uses ICMP to probe remote hosts for responsiveness and overall round-trip time of the probe messages. Both Transmission Control Protocol (TCP) and User Datagram Protocol (UDP) are transportation protocols, they are used to pass the actual data.

2018年3月14日 · Ping, absent of any qualifiers, is colloquially always using ICMP to probe a remote host for a response. The term originated with SONAR - send out a signal, and if it’s there, it responds. TCP and UDP are used for data transmission primarily. TCP is slower but more reliable, with regular confirmations sent back and forth.

2012年12月27日 · For one you can use the "ping tcp" command to test that some service is reachable from the ASA itself. We also use this command sometimes to test a L2L VPN connection so that we can confirm a remote host behind a L2L VPN connection is answering on the TCP port needed.

2019年3月11日 · Hi there, Please excuse me for this simple question I am confused about extended ACLS when we use (permit|deny) for Protocol IP,TCP,UDP on an access list I have 2 Examples below 1. access-list 102 permit tcp any 192.168.10.10 OR access-list 102 permit ip a...

2022年12月8日 · By looking at the ICMP payload (the "returned" packet), you can see that the HTTPS server at 192.168.15.4:443 was trying to send a TCP FIN to the client host 172.16.30.3, but either the client host is down and the gateway couldn't do an ARP lookup, or the packet was blocked by the gateway, so the undelivered packet is being returned to the web ...

2015年1月15日 · Port 7 is assigned for both TCP and UDP as the echo protocol, but that's not the same sort of thing as ICMP echo (i.e., what the ping command does). It's a TCP/UDP service that repeats anything you say to it, and it's not nearly as common as having ICMP echo. "Port" is a concept defined in TCP, in UDP, and in a few other protocols.

2018年1月20日 · I know that if a port scanner or something is checking a TCP port it will send TCP syns for the port and will try to establish a 3 way handshake. For UDP I know that it will just send protocol data depending on the port, or random data hoping for a response or icmp type 3 code 3. However, I want to be sure about one thing.

The general consensus is that TCP is used for non-real time, action oriented games. While UDP is used for real time, action oriented games. Expanding on this; TCP vs UDP as many have stated are matter of "making sure it is received and in order" in case of TCP and UDP is more "no guarantee, no order".

ICMP packets are used to encapsulate IP datagrams. This IP datagram may be: a UDP packet, part of a TCP segment, part of an SCTP/GRE/MPLS protocol data unit,or any other protocol higher than layer 2. Tunneling TCP data via ICMP. ICMP packets are used to encapsulate TCP segments, or IP datagrams that consist only of TCP segments.