ISP Articles PapersBooksBGP TableCIDR ReportIETF DocsRecent ArticlesNANOG 66February 2016NANOG continues to be one of the major gatherings on network operators and admins, together with the folk who work to meet the various needs of this community. Here are my reactions to some of the presentations I heard at NANOG 66, held in San Diego in February. More...(Full Report)On the Internet Everyone is Connected to Everyone Else - Right?February 2016Are we seeing evidence of a fragmented Internet where some places on the Internet cannot reach other places? Are these differences in the perspectives of various routing vantage points signs of underlying fractures of the fabric of connectivity in the Internet? More...(Full Report)BGP in 2015January 2016The Border Gateway Protocol, or BGP, has been holding the Internet together, for more than two decades and nothing seems to be falling off the edge so far. But the past does not necessarily determine the future. How well is BGP coping with the ever-growing Internet? More...FragmentationJanuary 2016One of the more difficult design exercises in packet switched network architectures is that of the design of packet fragmentation. In this article I’d like to examine IP packet fragmentation in detail and look at the design choices made by IP version 4, and then compare that with the design choices made by IP version 6. More...Addressing 2015January 2016Time for another annual roundup from the world of IP addresses. What happened in 2015 and what is likely to happen in 2016? More...What's in a Name?December 2015What’s the difference between .local and .here? Or between .onion and .apple? All four of these labels are capable of being represented in the Internet’s Domain Name System as a generic Top Level Domains (gTLDs), but only two of these are in fact delegated names while the other two cannot be delegated. It seems that Internet no longer has a single coherent name space, but has developed a number of silent and unsignalled fracture lines, and instead of being administered by a single administrative body there are a number of folk who appear to want to have a hand on the tiller! How have we managed to get ourselves into this somewhat uncomfortable position? More...RIPE 71 Meeting ReportNovember 2015The RIPE 71 meeting took place in Bucharest, Romania in November. Here are my impressions from a number of the sessions I attended that I thought were of interest. It was a relatively packed meeting held over 5 days so this is by no means all that was presented through the week. More...IPv6 PerformanceNovember 2015Every so often I hear the claim that some service or other does not support IPv6 not because of some technical issue, or some cost or business issue, but simply because the service operator is of the view that IPv6 offers an inferior level service as compared to IPv4, and by offering the service over IPv6 they would be exposing their clients to an inferior level of performance of the service. But is this rea