2009年6月10日 · The Internet Control Message Protocol (ICMP) is a network-layer Internet protocol that provides message packets to report errors and other information regarding IP packet processing back to the source. ICMP is documented in RFC 792.The version of ICMP for Internet Protocol version 4 is also known as ICMPv4, as it is part of IPv4.

2014年7月2日 · was doing some troubleshooting for allowing ICMP on one of our ASA (8.2) and got stuck with ICMP type and code. i've searched that ICMP type 11 is used by windows (link below). but would like to know what are the other ICMP types especially used by cisco devices.

2009年8月9日 · According to book, ICmp unreachable messages can includes fives seperate unreacable codes that further identify why the packet cannot be delivered. These codes are: Network unreachable: host unreacable. Can't fragment. protocol unreachable. port unreachable. what are the alphabitical codes to represent these above messages? thanks a lot.

2009年6月23日 · Solved: Hi every body! My book shows the following code: ! echo reply received. N network unreachable U destination unreachable M can not fragment the packet ? unknown packet received. ===== Who sends these codes? the

Hi Im trying to ping DMZ interface on ASA from INSIDE host and vise versa. It does not work :( Tried to debug icmp however the icmp packet did not even hit the DMZ interface from the particular host. Doing this with packet-tracer, ASA shows all results as ALLOW. Could one explain me how to permit ...

2003年6月25日 · ICMP: dst (198.186.40.64) administratively prohibited unreachable sent to 221.12.67.57 Question: How to tell my 2611XM router above, to allow these ICMP messages through, and what ICMP Protocol type can I let thru my CheckPoint firewall, in order to make Path-Discovery work properly?

2017年8月8日 · Here is another important syntax to test ICMP6 using packet tracer. ICMP (IPv4) and ICMP6 (IPv6) have different type and codes for echo request hence the correct code need to be used while testing ICMP echo request : Type 8 code 0 ICMP6 echo request : Type 128 code 0 FWL001/pri/act(config)# packe...

2004年5月14日 · ICMP: Type = 3 (Destination unreachable) ICMP: Code = 3 (UDP port 42309 unreachable. When doing DNS queries through a firewall. it seams to be fairly consistant that when ever the query takes longer than 5 - 10 Seconds. we receive the above ICMP response. Any ideas as to why this is happenning, and where is it exactly coming from. Many thanks

2009年7月10日 · So, it sends an ICMP message "Destination Unreachable" (ICMP Type: 3), with the additional information why it is unreachable (ICMP Code: 4), and includes the MTU of the interface that it was not able to send the packet on, alongside with the original IP header and 64 bits of the upper layer protocol (see RFC1191).

2006年9月23日 · Working with IPv6 and I received a return code of H. Anyone know where you can find what all the values for the ping reply mean including the H above?