Network2
This page proposes a fresh design for network configuration in a highly collaborative world, based on Scott's Network Principles in general and on these micro-principles in particular:
- Ease of debugging is paramount.
- Orthogonal pieces.
- Self-test functionality.
However, unlike the Network Principles situation, we also describe how to integrate several kinds of NAT-traversal technology, primarily to support dog-fooding and diagnosis by remote developers.
Client IPv6
Your job is to be an IPv6 node. Consequently, when you bring up your interfaces,
- You might discover an IPv6 router advertising on one of your links.
- (See sysctl net.ipv6.conf.all.accept_ra and related variables.)
- You might try out dhcp6c.
- You might have some kind of IPv4 connectivity. If so, connect to the Internet or to other internetworks (openvpn, ...) of your choice.
- Use dnshash to add guessable link-local addresses to all your links.
Server IPv6
Your job is to be an IPv6 router and a DNS server. One of several situations might obtain:
- You might discover an IPv6 router advertising one or more IPv6 prefixes on your outbound link(s).
- You might have some kind of IPv4 connectivity. If so, connect to the Internet or to other internetworks (openvpn, ...) of your choice.
- You might be under a tree. If so, generate a Unique Local Address prefix.
- (Use dnshash to add guessable link-local addresses to all your links?)
When done, use radvd or dhcp6d to share addresses.
Server DNS
One of the server's most important jobs is to get itself on appropriate internetworks so that it can dynamically map stable (DNS) names to unstable names [IPv6 addresses] for itself and its clients.
Unfortunately, the most reliable and secure means of updating these mappings is likely to be bespoke -- RFC 2136 is not widely implemented and specifies no concrete security protocol while DNSSEC seems immature at present.
Consequently, I propose the following strawman update protocol -- exchange an RFC-2136 UPDATE packet and response over your favorite authenticated RPC protocol with the nameserver.
(My favorite protocol for this sort of thing is currently "json-over-SSH-to-python-and-make", but variations (ucspi-ssl, 9p, etc.) make me smile.)