Ping Amazon EC2 Server Instances – How To

By default Amazon EC2 instances don’t respond to ICMP requests, i.e. ping.  Of course there are several reasons why one may want to ping an Amazon EC2 instance, including verifying if it is online and to test latency.  As with most things there is more than one approach to this issue. First, you could enable […]

tcping for Linux

tcping does a TCP connect to the given ip/port combination. The user can specify a timeout in seconds. This is useful in shell scripts running in firewalled environments. Often SYNs are just being dropped by firewalls, thus connection establishment will be retried several times (for minutes) until a TCP timeout is reached. With tcping it […]

Ping Over TCP with tcping.exe in Windows

tcping.exe (tcp ping) is a small console application that operates similarly to ‘ping’, however it works over a tcp port. Works with all versions of Windows – Windows 7, Windows Vista, Windows XP, Windows 2008, Windows 2003. Download tcping.exe. tcping example: C:>tcping Probing – Port is open – time=26.241msProbing – Port is open […]