2013年11月28日 · Here's documentation on how to compute the checksum of an ICMP header. ICMP Header Checksum. 16 bits. The 16-bit one's complement of the one's complement sum of the ICMP message, starting with the ICMP Type field. When the checksum is computed, the checksum field should first be cleared to 0.

2017年4月27日 · You can only ping an IP address, so you would have to resolve the IP via DNS if you have a hostname instead. Once you have an IP, you can use IcmpSendEcho() on Windows. On OSX, and maybe also Linux, you can use a UDP socket to send/receive ICMP echo packets without needing admin rights

The custom ICMP rule in the security group is not what it takes, a least for me. But the following rule will work: Type: All ICMP Protocol: TCP Port range: 0 - 65535 Source: Anywhere - 0.0.0.0/0 After doing this you will be able to ping other instances. You should see something like:

2013年10月23日 · The ICMP 'ping' packet, officially known as 'echo request', contains whatever the originating ping executable wants to have echoed back to it. In the Bad Old Days when the internet was first getting started up, the routers they had (and all computers, really) were subject to random memory failures.

2008年10月10日 · But that host still can't ping this interface or other hosts behind after I applied the ACL to the interface. Don't know why? I know this is a silly question:(access-list 110 deny icmp any any. access-list 110 permit ip any any. access-list 110 permit icmp host 10.10.1.1 any. access-list 110 permit icmp host 10.10.1.1 any echo-reply

2007年9月5日 · There are two options here: a) two host in the network configured with same ip address; b) check the IP address and make sure you are not pinging an SVI IP address ( IP address living on vlan interface, so to speak); in that care most likely all the host in that SVI might reply to your ping.

2009年5月29日 · ICMP packets are generally delivered slower (if there is a difference at all), because most networks deprioritise them, especially ping packets. Generally, if you are seeing such divergent results from ICMP and TCP responses, the issue is either an overloaded server or specific TCP shaping at a firewall along the way.

2013年11月12日 · Scapy ICMP echo request (Ping) is not replied while a Ping from the command line gets replies. 0.

2011年2月10日 · client --AJAX-- yourserver --ICMP ping-- targetservers Make an AJAX request to your server, which will then ping the target servers for you, and return the result in the AJAX result. Possible caveats: this tells you whether the target servers are pingable from your server, not from the user's client so the client won't be able to test hosts its LAN

2024年3月23日 · Using ping in C# is achieved by using the method Ping.Send(System.Net.IPAddress), which runs a ping request to the provided (valid) IP address or URL and gets a response which is called an Internet Control Message Protocol (ICMP) Packet. The packet contains a header of 20 bytes which contains the response data from the server …