| caribou | Hello, I have another IPv6 question around the new version of our DataSource. It looks like the network-manager renderer forces a /64 subnet when defining the default gateway (as seen in this example : https://paste.ubuntu.com/p/tMYZr8Mh5r/) | 15:46 |
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| caribou | on at least CentOS stream 8 it doesn't work. My current workaround is to use the deprecated gateway6 keywork which adds `gateway={IPv6 addr}` | 15:48 |
| waldi | you are talking about "::/64"? | 15:48 |
| caribou | yes. In the yaml config (and also what is passed by our DataSourceScaleway.py), the input is ::/0 | 15:49 |
| waldi | this is not "a /64 subnet" | 15:49 |
| waldi | and which version? | 15:49 |
| caribou | Jammy's 22.4-1 (sorry network hickup) | 15:51 |
| caribou | I have to problem with the netplan & ENI renderers on Ubuntu & Debian | 15:52 |
| caribou | If I manually add a ip -6 route add default via fe80::dc00:00ff:fe01:6552 dev eth0 everything works fine | 15:53 |
| waldi | ubuntu jammy contains cloud-init 22.4.2-0ubuntu0~22.04.1 as of now | 15:53 |
| caribou | yeah, I now, but this is network-manager rendering on CentOS, not on Jammy | 15:54 |
| waldi | irrelevant. i want to know which code you are using | 15:54 |
| caribou | When I started working on the DS, 22.4-1 was the most recent. Now COPR has 22.4-1 for the RH based and I need a minimum of 22.4 to get EphemeralIPv6Network | 15:56 |
| waldi | i can reproduce it on a debian 22.4.2-1. reason is cloudinit.net.network_state._normalize_route is called to times. in the first iteration /0 is split away, in the second this info is not used and prefix is overwiriten with 64. not sure why | 16:03 |
| caribou | ok, thanks for testing. So looks like this is not to be expected then | 16:05 |
| waldi | not at all | 16:06 |
| caribou | Want me to create a bug on this ? | 16:08 |
| waldi | please do | 16:15 |
| caribou | on my way | 16:16 |
| caribou | do you want the bug on Launchpad or GH ? | 16:16 |
| waldi | launchpad, see topic | 16:16 |
| caribou | that's what I thought | 16:17 |
| minimal | caribou: I'm currently looking into issues with the eni renderer and network config v2 "routes:" versus gateway4/gateway6 | 16:18 |
| caribou | minimal: ENI seems to work fine, I tested my DS on bullseye | 16:18 |
| minimal | caribou: eni sort of works - the eni created *should* use "gateway" for the default route, however it uses pre-up/post-up entries instead | 16:19 |
| caribou | yep, saw that while trying to figure out why it didn't work on CentOS | 16:20 |
| minimal | whilst this sort-of-works it means that for providers giving either a /32 IPv4 address or a /128 IPv6 address (i.e. where the gateway is NOT in the same subnet) then ifupdown/ifupdown-ng's workaround of always specifying the "onlink" option to "ip route add" does NOT happen for the default route (whereas if eni uses "gateway" it does | 16:22 |
| minimal | I'm in the process of investigating/working on a fix for this and some other eni-related issues | 16:22 |
| caribou | A few weeks back we had a discussion on a similar topic for IPv4 where I had to use the on-link option as the default gw is not in the same subnet. Turned out we went back to DHCPv4 so it was not needed anymore | 16:24 |
| minimal | right, but using "routes:" for IPv4 has the same issue with eni of "onlink" not being used | 16:25 |
| caribou | since it was early testing, I was using Jammy and the netplan renderer is a passthrough so I was able ot use on-link | 16:28 |
| minimal | I fixed Alpine's ifupdown-ng package to act the same as Debian's ifupdown in adding "onlink" for the default route, now there is this need for default routes specified via "routes" in cloud-init's v2 to use "gateway" rather than "pre-up/post-up" for eni for the rest of the fix | 16:29 |
| caribou | FYI : https://bugs.launchpad.net/ubuntu/+source/cloud-init/+bug/2003562 | 16:31 |
| -ubottu:#cloud-init- Launchpad bug 2003562 in cloud-init (Ubuntu) "network-manager renderer does not honour IPv6 default route subnet" [Undecided, New] | 16:31 | |
| caribou | Thanks for the attention : I'm heading out & will be checking the backlog & bug on monday ! | 16:42 |
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