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Bullseye und bonding

Guten Morgen Liste,
ich versuche mit den aktuellen Programmversionen unter Bullseye ein bonding zu konfigurieren, aber ohne dauerhaften Erfolg. 

Die Einträge in /etc/network/interfaces siehen (anonymisiert) wie folgt aus:
source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback

auto eno1
iface eno1 inet static
    address d.e.f.110
    netmask 255.255.255.128
    network d.e.f.0
    broadcast d.e.f.127
    gateway d.e.f.1
    dns-nameservers ns3 ns4
    dns-search xxx.tld.de

auto bond0
iface bond0 inet static
    address a.b.c.2
    netmask 255.255.255.240
    network a.b.c.0
    broadcast a.b.c.15
    gateway a.b.c.1
    dns-nameservers ns1 ns2 ns3
    dns-search xxx.tld.de
    bond-mode balance-rr
    bond-slaves eno3 eno4
    bond-miimon 100
    bond-downdelay 200
    bond-updelay 200
Ein "systemctl restart networking" gefolgt von einem "journalctl -xe" erbringt: 
Nov 09 08:25:21 R720xd ifup[2340810]: RTNETLINK answers: File exists
Nov 09 08:25:21 R720xd ifup[2340791]: ifup: failed to bring up eno1
Nov 09 08:25:21 R720xd connmand[124278]: bond0 {RX} 1473 packets 165473 bytes 
Nov 09 08:25:21 R720xd connmand[124278]: bond0 {TX} 0 packets 0 bytes
Nov 09 08:25:21 R720xd connmand[124278]: bond0 {newlink} index 11 address 24:6E:96:0C:BD:4A mtu 1500 Nov 09 08:25:21 R720xd connmand[124278]: bond0 {newlink} index 11 operstate 2 <DOWN> Nov 09 08:25:21 R720xd connmand[124278]: bond0 {RX} 1473 packets 165473 bytes 
Nov 09 08:25:21 R720xd connmand[124278]: bond0 {TX} 0 packets 0 bytes
Nov 09 08:25:21 R720xd connmand[124278]: bond0 {newlink} index 11 address 24:6E:96:0C:BD:4A mtu 1500 Nov 09 08:25:21 R720xd connmand[124278]: bond0 {newlink} index 11 operstate 2 <DOWN> Nov 09 08:25:21 R720xd connmand[124278]: bond0 {RX} 1473 packets 165473 bytes 
Nov 09 08:25:21 R720xd connmand[124278]: bond0 {TX} 0 packets 0 bytes
Nov 09 08:25:21 R720xd connmand[124278]: bond0 {newlink} index 11 address 24:6E:96:0C:BD:4A mtu 1500 Nov 09 08:25:21 R720xd connmand[124278]: bond0 {newlink} index 11 operstate 2 <DOWN> Nov 09 08:25:21 R720xd kernel: bond0: option mode: unable to set because the bond device has slaves Nov 09 08:25:21 R720xd ifup[2340816]: /etc/network/if-pre-up.d/ifenslave: 39: echo: echo: I/O error 
Nov 09 08:25:21 R720xd ifup[2340821]: ifquery: unknown interface eno3
Nov 09 08:25:21 R720xd ifup[2340829]: ifquery: unknown interface eno4
Nov 09 08:25:21 R720xd ifup[2340838]: RTNETLINK answers: File exists
Nov 09 08:25:21 R720xd ifup[2340791]: ifup: failed to bring up bond0

Ändere ich die Konfiguration in:
auto eno3
iface eno3 inet manual
    bond-master bond0

auto eno4
iface eno4 inet manual
    bond-master bond0

auto bond0
iface bond0 inet static
    address a.b.c.2
    netmask 255.255.255.240
    network a.b.c.0
    broadcast a.b.c.15
    gateway a.b.c.1
    dns-nameservers ns1 ns2 ns3
    dns-search xxx.tld.de
    bond-mode balance-rr
    bond-miimon 100
    bond-downdelay 200
    bond-updelay 200
gefolgt von "systemctl restart networking" gefolgt von einem "journalctl -xe" ergibt dann: 
Nov 09 08:32:23 R720xd ifup[2354487]: RTNETLINK answers: File exists
Nov 09 08:32:23 R720xd ifup[2354468]: ifup: failed to bring up eno1
Nov 09 08:32:23 R720xd connmand[124278]: bond0 {RX} 1473 packets 165473 bytes 
Nov 09 08:32:23 R720xd connmand[124278]: bond0 {TX} 0 packets 0 bytes
Nov 09 08:32:23 R720xd connmand[124278]: bond0 {newlink} index 11 address 24:6E:96:0C:BD:4A mtu 1500 Nov 09 08:32:23 R720xd connmand[124278]: bond0 {newlink} index 11 operstate 2 <DOWN> Nov 09 08:32:23 R720xd connmand[124278]: bond0 {RX} 1473 packets 165473 bytes 
Nov 09 08:32:23 R720xd connmand[124278]: bond0 {TX} 0 packets 0 bytes
Nov 09 08:32:23 R720xd connmand[124278]: bond0 {newlink} index 11 address 24:6E:96:0C:BD:4A mtu 1500 Nov 09 08:32:23 R720xd connmand[124278]: bond0 {newlink} index 11 operstate 2 <DOWN> Nov 09 08:32:23 R720xd connmand[124278]: bond0 {RX} 1473 packets 165473 bytes 
Nov 09 08:32:23 R720xd connmand[124278]: bond0 {TX} 0 packets 0 bytes
Nov 09 08:32:23 R720xd connmand[124278]: bond0 {newlink} index 11 address 24:6E:96:0C:BD:4A mtu 1500 Nov 09 08:32:23 R720xd connmand[124278]: bond0 {newlink} index 11 operstate 2 <DOWN> Nov 09 08:32:23 R720xd ifup[2354493]: /etc/network/if-pre-up.d/ifenslave: 39: echo: echo: I/O error Nov 09 08:32:23 R720xd kernel: bond0: option mode: unable to set because the bond device has slaves 
Nov 09 08:32:23 R720xd ifup[2354499]: RTNETLINK answers: File exists
Nov 09 08:32:23 R720xd ifup[2354468]: ifup: failed to bring up bond0
Ein "systemctl stop connman" mit anschließendem "systemctl restart networking" erbringt zwar das "ifup: failed to bring up eno1" verschwindet (und eno1 auch wieder nutzbar ist), aber die bond0 Problematik bleibt bestehen ... 
Also entweder:
Nov 09 09:12:06 R720xd ifup[2431415]: /etc/network/if-pre-up.d/ifenslave: 39: echo: echo: I/O error Nov 09 09:12:06 R720xd kernel: bond0: option mode: unable to set because the bond device has slaves Nov 09 09:12:06 R720xd postfix/postfix-script[2431426]: refreshing the Postfix mail system 
Nov 09 09:12:06 R720xd ifup[2431434]: RTNETLINK answers: File exists
Nov 09 09:12:06 R720xd ifup[2431172]: ifup: failed to bring up bond0

oder:
Nov 09 09:13:22 R720xd ifup[2434127]: /etc/network/if-pre-up.d/ifenslave: 39: echo: echo: I/O error Nov 09 09:13:22 R720xd kernel: bond0: option mode: unable to set because the bond device has slaves 
Nov 09 09:13:22 R720xd ifup[2434133]: RTNETLINK answers: File exists
Nov 09 09:13:22 R720xd ifup[2434113]: ifup: failed to bring up bond0

Hat jemand einen Tip, oder eine unter Bullseye nutzbar Konfig?

Mit Dank und Gruß
Torsten
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