[systemd-devel] Bug or misconfiguration for systemd-networkd and VXLAN?

[Lukas Wolf]

It's working now, I had my understanding messed up a little. Thanks for the
clarification!

Kind regards,
Lukas Wolf

On Mon, 14 Nov 2022 at 20:05, Andrei Borzenkov <arvidjaar at gmail.com> wrote:

> On 14.11.2022 15:49, Lukas Wolf wrote:
> > Hi all and thanks a lot for all your work on systemd!
> >
> > I'm trying to setup a VXLAN configuration with multicast with
> > systemd-networkd but struggle to make it work. What I'm trying to
> replicate
> > is the following (working command):
> >
> > ip link add vxlan100 type vxlan id 100 dstport 4789 local 10.100.200.4
> > group 224.4.0.144 dev lo ttl 5
> > (this command fails without specifying 'dev lo')
> >
> > My config file, vxlan100.netdev:
> > [NetDev]
> > Name=vxlan100
> > Kind=vxlan
> >
> > [VXLAN]
> > VNI=100
> > TTL=5
> > DestinationPort=4789
> > Group=224.0.0.144
> > Local=10.100.200.4
> > Independent=true
> >
>
> If you want Group you need device and so cannot use Independent
> ...
> >
> > As seen in the last line of the log, it throws an invalid argument error
> > and no VXLAN device is created. This does not happen if I remove the
> > "Group=" part in the configuration.  As mentioned above, the "ip add
> link"
> > command needs a "dev=" argument to work but I have not found a way to
> > specify a device in the netdev config file...
> >
> > I have also tried it without Independent=true and having a network file
> > instead with VXLAN=vxlan100,
>
> Wat do you mean "instead"? You need network file for base interface that
> refers to vxlan and netdev file for vxlan.
>
> > but then it just silently fails without log
> > output.
> >
>
> Works for me (at least, to the extent that vxlan100 is created)
>
> bor at bor-Latitude-E5450:~$ ip l
> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode
> DEFAULT group default qlen 1000
>      link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
> 2: eno1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel
> state DOWN mode DEFAULT group default qlen 1000
>      link/ether 34:e6:d7:85:0b:1c brd ff:ff:ff:ff:ff:ff
>      altname enp0s25
> 3: wlp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
> state UP mode DORMANT group default qlen 1000
>      link/ether 5c:e0:c5:27:c7:70 brd ff:ff:ff:ff:ff:ff
> 4: br0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state
> DOWN mode DEFAULT group default qlen 1000
>      link/ether 6a:7b:d1:2a:ce:9d brd ff:ff:ff:ff:ff:ff
> 5: tap0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel
> master br0 state DOWN mode DEFAULT group default qlen 1000
>      link/ether 2a:7d:ac:33:fd:47 brd ff:ff:ff:ff:ff:ff
> bor at bor-Latitude-E5450:~$ sudo systemctl start systemd-networkd.service
> bor at bor-Latitude-E5450:~$ ip l
> ...
> 13: vxlan100: <BROADCAST,MULTICAST> mtu 1450 qdisc noop state DOWN mode
> DEFAULT group default qlen 1000
>      link/ether b6:1d:97:9f:e6:eb brd ff:ff:ff:ff:ff:ff
> bor at bor-Latitude-E5450:~$ cat /etc/systemd/network/eno1.network
> [Match]
> Name=eno1
>
> [Link]
> ActivationPolicy=always-up
>
> [Network]
> ConfigureWithoutCarrier=true
> Address=10.10.10.10/24
> VXLAN=vxlan100
> bor at bor-Latitude-E5450:~$ cat /etc/systemd/network/vxlan100.netdev
> [NetDev]
> Name=vxlan100
> Kind=vxlan
>
> [VXLAN]
> VNI=100
> TTL=5
> DestinationPort=4789
> Group=224.0.0.144
> Local=10.10.10.10
> bor at bor-Latitude-E5450:~$
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/systemd-devel/attachments/20221116/f4f99ace/attachment.htm>