Resilience

25 June 2014 at 2:15pm
So you've designed your redundant architecture and ensured that your data is being replicated across it? All set? Not quite. Within your DNS configuration there are two timers that we frequently see misconfigured -  TTL values and the SOA expire value. Frequently we see these left at default a default of one day (86400 seconds). Whilst these may suit many organisations it's worth taking a closer look to make sure that they match your expectation for your DNS services.
24 June 2014 at 1:53pm
Having designed a redundant DNS infrastructure, one of the most common mistakes is failing to ensure that secondary nameservers can successfully replicate data for the domains it is hosting. The most common way this is done on the Internet is though zone transfers - the AXFR command. This command causes a DNS server to reply with all the data it knows for a domain.
7 June 2013 at 10:33am
A wide-ranging panel discussion at the TERENA Networking Conference considered the stability of the Internet routing system at all levels from technology to regulation. The conclusion seemed to be that at the moment the Internet is stable because two systems, technical and human, compensate effectively for each others’ failings. While improvements to increase stability may be possible, they must beware of disrupting the current balance or introducing new ways that it can fail.
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