It is common to allocate /24 or /22 subnets to a single VLAN but William writes to ask why and whether is related to broadcasts. What is the best subnet size for VLAN allocation and why ? The answer isn’t what you think.
I’ve spent some hours taking a look at Docker containers and how they connect to the network. The short summary is “messy” and better description is “train wreck”. Chris Swan has a 30 minute presentation on his experiences with Docker as part of his company VNS3. Docker Networking | Chris Swan’s Weblog. At this point […]
These are two standards for single mode fibre optic cabling from a total of five types of fibre that are generically used today known of “OF types” (OM1, OM2, OM3 for multimode and OS1,OS2 for single mode.) OS1 is for indoor use i.e. Campus, Data Centre. Cabling is is tight buffered (i.e. manufactured into solid […]
Out of sheer frustration this week, I tweeted this and got a big response: The Back Story I’ve wasted about 60 hours of customers time working with resellers & vendors to get a quote for a relatively simple network upgrade. Neither the vendor staffers or the reseller employees knew how the product was licensed or […]
Kaspersky published a research note on Black Energy malware that uses backdoors and exploits on Cisco routers to install a TCL file, perform surveillance or destruction of the device configuration. And, they revealed that their Cisco routers with different IOS versions were hacked. They weren’t able to connect to the routers any more by […]