Server addressing for renumbering ease

Mohacsi Janos mohacsi at
Sun Nov 7 21:22:24 CET 2010

On Sat, 6 Nov 2010, Ben Jencks wrote:

> According to [1], they used EUI-64 addressing on their servers so that
> they could renumber easily. The common objection to that is that you
> wouldn't want to change DNS anytime you swapped a NIC (and thus a mac
> address). The obvious alternative is static addressing, but that makes
> renumbering a pain. There's also DDNS, but that seems like a bigger
> headache than either of the above [2]. What are people here doing?

Using autoconfigured addresses on servers are bad idea. If you want to 
generate big problems for yourselves, use it on DNS servers....

In 6diss/6deploy training material we are advocating using static 
addresses for servers:

> Some other options:
> * Solaris lets you configure just the host-part, and it takes the
> network-part from RAs. This seems ideal, but it only works on solaris.
> * Use a configuration management system (puppet, chef, cfengine, etc)
> to assign addresses, so you can do find/replace in one place during
> renumbering. This would require being very careful as you risk
> breaking the connection to the config server itself.
> I know it's an old topic, but there doesn't seem to be a lot of
> guidance around. If there's a consensus I can see about making a page
> at
> [1]
> [2] You can give each server only the ability to update its own name,
> but you have to give them all free reign over the reverse zone. Seems
> like a security nightmare. Alternatively you can do it through DHCP,
> but then you're back to mac-address dependence (client-identifier is
> configurable, therefore not trustworthy).
> -Ben

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