I had an assignment at university that dealt with the size of a message after being sent through two different types of networks with different packet sizes and network headers. That's all we were ...

[Part 1 of this article looks at the IP header, the IP checksum and fragmentation.] IPv6 The current IP address scheme of 32-bit words is fast becoming inadequate. It would appear that 2 32 = 4 294 ...

This is causing me some grief, because it's resulting in SPF failures. The FQDN in the mail headers is correct, but the resolved IP is not. It appears to be a gateway address or something (last valid ...

Have you ever performed surgery on data packets? There are times when that may be the best way to troubleshoot and optimize your network. This edition of the Packet Professor will get you started in ...

Voice over IP (VoIP) is the descriptor for the technology used to carry digitised voice over an IP data network. VoIP requires two classes of protocols: a signaling protocol such as SIP, H.323 or MGCP ...

The purpose of the network layer is to help route messages between different local networks. Central to this layer is the concept of exclusive network addresses, where every terminal connected to the ...

If you use Office 365's webmail interface to prevent email recipients from seeing your local IP address, you are out of luck. When sending email through Office 365, your local IP address will be ...