!tCyGickeVqkHsYjWnh:nixos.org

NixOS Networking

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Declaratively manage your switching, routing, wireless, tunneling and more. | Don't rely on `networking.*` for interface and routing setup, use systemd-networkd, ifstate or NetworkManager instead. | Set `SYSTEMD_LOG_LEVEL=debug` to debug networking issues with networkd | No bad nft puns, please. | Room recommendations: #sysops:nixos.org259 Servers

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SenderMessageTime
9 May 2026
@raitobezarius:matrix.orgraitobezarius2*40G, 16*10G, 48*1G with PoE variants09:46:20
@raitobezarius:matrix.orgraitobezariusCan be found for ~100-200USD09:46:31
@raitobezarius:matrix.orgraitobezariusIt cannot run an Linux OS at all except if you want a fun porting project09:46:53
@raitobezarius:matrix.orgraitobezariusNewer Brocade have proper ARM but probably no upstream Linux support I'd argue, but it's not that hard to add it09:47:55
12 May 2026
@mrfoxpro:matrix.org@mrfoxpro:matrix.org left the room.17:45:43
@elisaado:elisaado.comEli Saado should I trust the networking.nat.* options or should I use raw nftables instead? 22:01:55
@me:m4rc3l.deMarcelI use it on my gateway without issues.22:14:34
@elisaado:elisaado.comEli Saadoyay22:33:14
13 May 2026
@hxr404:tchncs.de@hxr404:tchncs.de left the room.09:33:18
14 May 2026
@pederbs:pvv.ntnu.no@pederbs:pvv.ntnu.no left the room.01:35:52
16 May 2026
@catbrained:tchncs.decatbrained (she/her)

I just noticed a new interface show up when I do ip link:

ip6tnl0@NONE: <NOARP> mtu 1452 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/tunnel6 :: brd :: permaddr caf7:96db:24d5::

I'm not sure what this is and I have no clue why it's there. Doesn't seem to serve any purpose since it's DOWN and my internet is still working just fine. 🤷‍♀️
Not sure how long it's been there either.
I tried deleting it with ip link delete ip6tnl0 but it's still there.
Can anyone point me towards how I can figure out where this thing is coming from (and perhaps how to get rid of it)?

20:58:00
@rntpts:synapse.rntpts.derntptsUpdate: https://github.com/NixOS/nixpkgs/pull/51653921:01:16
@rntpts:synapse.rntpts.derntpts(to get rid of it)21:01:50
@catbrained:tchncs.decatbrained (she/her)Thank you! 🙏21:03:20
17 May 2026
@emilazy:matrix.orgemilyso what's the state of the art for exposing IPv4 ports when using NAT64?16:01:12
@emilazy:matrix.orgemilydoes PCP have a notion for that?16:02:07
@emilazy:matrix.orgemily(relatedly, what's the state of the art for NAT64 at this point? did that NetworkManager etc. stuff or the kernel-space stuff happen?)16:03:18
@hexa:lossy.networkhexa (clat on linux when)pcp is something your isp would need to support16:03:20
@hexa:lossy.networkhexa (clat on linux when)nm nat64 support did not land in the current release16:03:37
@hexa:lossy.networkhexa (clat on linux when)it will land in the next16:03:40
@emilazy:matrix.orgemilyin this situation I'm imagining the gateway/router doing the NAT6416:04:36
@emilazy:matrix.orgemilyso it has a public v416:04:41
@emilazy:matrix.orgemilyquestion is, how can clients ask "give me an exposed v4 port that forwards to this port on my v6, thanks"16:05:01
@hexa:lossy.networkhexa (clat on linux when)I only tried jool so far, and I don't think it supports pcp16:05:02
@emilazy:matrix.orgemilyoh yeah it would be a separate daemon for sure16:05:13
@raitobezarius:matrix.orgraitobezariusMAP-T16:05:13
@emilazy:matrix.orgemilyI mean it's really just a matter of port forwarding on the v4 end16:05:22
@emilazy:matrix.orgemilyright (omg why are there so many overlapping acronyms and similar-but-not-quite-identical mechanisms in this stuff)16:06:01
@raitobezarius:matrix.orgraitobezariussomething something about the people writing them16:06:16
@raitobezarius:matrix.orgraitobezariusjool supports MAP-T16:06:23

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