Lately, Google mail servers are getting more extravagant in what mail they accept. Setting up a Sender Policy Framework (SPF) DNS record is a relatively low effort way to get mail though users of the Google mail service. (Those users aren't necessarily identifiable by the Gmail domain as it's also …
When sending a POST request with curl it sometimes automatically
adds an Expect: 100-continue header. The following summarizes under
which conditions curl/libcurl adds this header.
The Expect: 100-continue header is specified in HTTP 1.1 and
allows the server to acknowledge or reject a POST/PUT request
immediately …
The Link Layer Discovery Protocol (LLDP) probably isn't the most popular protocol but it can be useful for troubleshooting purposes and for mapping the neighbourhood of a host.
Its purpose is basically to send/receive key/value pairs that are of general interest. For example the switch port number the …