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 […]
Category: tcping
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 […]