Ich muss die bitrate manuell einstellen -> udev?
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/usr/sbin/ip link set can1 type can bitrate 125000

root 00:14 : /usr/lib/systemd/network # cat can0.network 
[Match]
Name=can0

[CAN]
BitRate=125K

Danach sieht es so aus
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root 00:14 : /usr/lib/systemd/network # networkctl 
IDX LINK TYPE     OPERATIONAL SETUP     
  1 lo   loopback carrier     unmanaged 
  2 can0 can      carrier     configured
  3 can1 can      carrier     configured
  4 eth0 ether    routable    unmanaged 
  5 sit0 sit      off         unmanaged 



root 00:16 : /usr/lib/systemd/network # ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UP group default qlen 10
    link/can 
3: can1: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UP group default qlen 10
    link/can 
4: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:05:7e:04:47:67 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.62/24 brd 192.168.1.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 fd5c:3d74:f4d7:beef:205:7eff:fe04:4767/64 scope global dynamic mngtmpaddr 
       valid_lft 6959sec preferred_lft 3359sec
    inet6 2a02:908:1965:8960:205:7eff:fe04:4767/64 scope global dynamic mngtmpaddr 
       valid_lft 6959sec preferred_lft 3359sec
    inet6 fe80::205:7eff:fe04:4767/64 scope link 
       valid_lft forever preferred_lft forever
5: sit0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN group default qlen 1000
    link/sit 0.0.0.0 brd 0.0.0.0