Tagged in: dns, projects

§ Switch

Recently switched over from Free to Orange.

§ Pros

• Fiber: 200Mbps Down, 50Mbps Up, up from 16Mbps Down and… nvm
• Cheaper. Yup.
• Customer-facing service actually exists. (Responds in < 2 months)

§ Cons

• No fixed IPv4 address
• No IPv6 configuration; only the on-off switch. Nothing like “Next Hop”, etc.
• No TFx channels, TF1 wants money, Orange won’t give in… let’s see where it goes

§ Consequences

• Downloading games has never been this fast
• DynDNS is stupid, simple, I like it
• Must use DynDNS
• Must deploy my own IPv6 tunnel
• IPv6-readiness and availability down (because it relies on a valid IPv4 address)
• Unhappy girlfriend

§ DynDNS

Problem: changing IPv4 address. My NAS would change IP regularly, because “The fixed IP option is not compatible with fiber” Orange Conseil.

Solution: DynDNS. Make a regular curl(1) call to the specific endpoint, and TADA.

#!/bin/sh

OVH_USER="domain.ovh-user"
OVH_KEY='123456abcdef'
OVH_HOST="local.domain.ovh"

PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin

*/5  *    *    *    *    curl -4s --user "$OVH_USER:$OVH_KEY" "https://www.ovh.com/nic/update?system=dyndns&hostname=${OVH_HOST}"

Thanks Wojciech Langiewicz

§ IPv6

§ It works…

As usual, HurricaneElectric provides! Click click click, new tunnel up and running.

Same as above for DynDNS updates:

*/5  *    *    *    *    curl -4s --user "$TB_USER:$TB_KEY" "https://ipv4.tunnelbroker.net/nic/update?hostname=${TB_ID}"

API is documented here.

§ …not!

Stupid issues, first identified because of very, very low speed when downloading from a FreeBSD repo. Some tcpdump(1), ping(1) later, here’s an issue that even Google doesn’t know about:

00:00:04.045368 AF IPv6 (28), length 84: version error: 0 != 6

Which, of course, is as helpful as it’s expressive. Maybe a broken config on my end? After all, I’m still at the beginner level of networking. Wrong prefixlen? Nope, changing it breaks even ping6. Oops.