Category Archives: Article

IPv6 – too many addresses?

Talking with people about IPv6, I regularly hear the complaint that IPv6 subnets have “too many addresses”. That it is “wasteful” to use /64 subnets, and that we should subnet down to “more realistic” subnet sizes. The complaint comes from … Continue reading

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Why “why” matters

A participant on the NANOG mailing list recently made the comment that “with a small amount of conceptual knowledge, the differences between IPv4 and IPv6 become very very small.” True! And perhaps an anecdote will illustrate why conceptual knowledge, not … Continue reading

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Subnet Router Anycast Addresses – what are they, how do they work?

Discussions on several mailing lists have shown that there is still a lot of misunderstanding”out there” about what subnet router anycast addresses are, and how they work. This article aims to help out, because the concept is actually pretty simple.

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Mikrotik DNS case-INsensitivity issue

Got an email a while ago from a chap who was having some difficulty with a Pioneer device; specifically a Pioneer VSX-53 (http://www.pioneerelectronics.com/PUSA/Home/AV-Receivers/Elite+Receivers/VSX-53). The Pioneer was unable to resolve a particular name. The Pioneer was connected to the internet via … Continue reading

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/64 subnets – a waste of IPv6 address space?

The discussion pops up again and again – someone says “but /64 subnets are such a waste! Surely we only need n bits?” (where “n” is any number smaller than 64). Then someone chimes in and says “we should have … Continue reading

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MikroTik and NetInstall

Today I bricked a MikroTik router. I have no idea what went wrong, but after upgrading an RB951G to 5.25, it was, um, uncommunicative. No SSID visible, no DHCP happening on the Ethernet ports, no response even when I set … Continue reading

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DHCPv6 – is REBIND pointless?

As part of improving our course materials, I was refreshing my understanding of DHCPv6 a couple of days ago, and found myself thinking about the REBIND message. After close consideration of the relevant RFC (RFC 3315), and even posting a … Continue reading

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MikroTik, IPv6, GRE6 and OSPFv3

This is not a very interesting post, but perhaps it will show up in a search and save some poor soul the hour or two I wasted. I was trying to a get a GRE6 tunnel up between two MikroTik … Continue reading

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They keep amazing me… ssh tunnelling to a MikroTik

It amazes me when a $50 device supports ssh tunelling! I wanted to run the web interface on a MikroTik router I’d just installed. Command line access is all very well, but for a lot of stuff, the web interface … Continue reading

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A MikroTik router and Internode’s IPv6

Here is how I got my MikroTik RB951-2n working with Internode’s native IPv6 service over ADSL. I did not nut all this out myself; there was googling involved, but nothing I found was complete and many articles assumed I knew … Continue reading

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