I'd just suspect some rogue dhclient running on the system.
Check the process list for dhclient instances and their cmdlines.
NetworkManager should not be running any dhclient for that interface
with this config.
-yoctozepto
On Tue, Sep 22, 2020 at 3:38 PM Simon Matter <simon.matter@xxxxxxxxx> wrote:
>
> Hi Felix
>
> > Dear Simon,
> >
> > every second IP-address is unwanted. We restarted eno4:
> >
> > nmcli con down eno4; nmcli con up eno4
> >
> > and the second address vanishes. Then after a few ours, the second ip
> > address reappears.
>
> That's really interesting. Doesn't NetworkManager also store other
> settings in a different location, not the ifcfg files? I think it does so
> and you may have to check there.
>
> Also, don't forget that there could be other tools running on the host
> which fiddle with NetworkManager.
>
> That said, I usually don't use NetworkManager on my servers so I don't
> really know much about it.
>
> Hope some NM experts can help you more.
>
> Regards,
> Simon
>
> >
> >
> > This is the config-file of eno2:
> >
> > # cat ifcfg-eno2
> > TYPE=Ethernet
> > PROXY_METHOD=none
> > BROWSER_ONLY=no
> > BOOTPROTO=none
> > DEFROUTE=yes
> > IPV4_FAILURE_FATAL=yes
> > IPV6INIT=no
> > IPV6_AUTOCONF=yes
> > IPV6_DEFROUTE=yes
> > IPV6_FAILURE_FATAL=no
> > IPV6_ADDR_GEN_MODE=stable-privacy
> > NAME=eno2
> > UUID=cb6fcb54-be52-4ab6-8324-88091a0ea1a0
> > DEVICE=eno2
> > ONBOOT=yes
> > IPV6_PRIVACY=no
> > IPADDR=10.10.100.205
> > PREFIX=24
> > GATEWAY=10.10.100.254
> > DNS1=10.10.100.1
> > DNS2=10.10.100.2
> > DOMAIN=ourDomain
> >
> > I am not aware of this setting:
> >
> > scope global secondary dynamic
> >
> >
> > So maybe you are able to find it in the nmcli output:
> >
> > # nmcli con edit eno2
> >
> > ===| nmcli interactive connection editor |===
> >
> > Editing existing '802-3-ethernet' connection: 'eno2'
> >
> >
> > nmcli> p
> > ===============================================================================
> > Connection profile details (eno2)
> > ===============================================================================
> > connection.id: eno2
> > connection.uuid: cb6fcb54-be52-4ab6-8324-88091a0ea1a0
> > connection.stable-id: --
> > connection.type: 802-3-ethernet
> > connection.interface-name: eno2
> > connection.autoconnect: yes
> > connection.autoconnect-priority: 0
> > connection.autoconnect-retries: -1 (default)
> > connection.multi-connect: 0 (default)
> > connection.auth-retries: -1
> > connection.timestamp: 1600780222
> > connection.read-only: no
> > connection.permissions: --
> > connection.zone: --
> > connection.master: --
> > connection.slave-type: --
> > connection.autoconnect-slaves: -1 (default)
> > connection.secondaries: --
> > connection.gateway-ping-timeout: 0
> > connection.metered: unknown
> > connection.lldp: default
> > connection.mdns: -1 (default)
> > connection.llmnr: -1 (default)
> > connection.wait-device-timeout: -1
> > -------------------------------------------------------------------------------
> > 802-3-ethernet.port: --
> > 802-3-ethernet.speed: 0
> > 802-3-ethernet.duplex: --
> > 802-3-ethernet.auto-negotiate: no
> > 802-3-ethernet.mac-address: --
> > 802-3-ethernet.cloned-mac-address: --
> > 802-3-ethernet.generate-mac-address-mask:--
> > 802-3-ethernet.mac-address-blacklist: --
> > 802-3-ethernet.mtu: auto
> > 802-3-ethernet.s390-subchannels: --
> > 802-3-ethernet.s390-nettype: --
> > 802-3-ethernet.s390-options: --
> > 802-3-ethernet.wake-on-lan: default
> > 802-3-ethernet.wake-on-lan-password: --
> > -------------------------------------------------------------------------------
> > ipv4.method: manual
> > ipv4.dns: 10.10.100.1,10.10.100.2
> > ipv4.dns-search: ourDomain
> > ipv4.dns-options: --
> > ipv4.dns-priority: 0
> > ipv4.addresses: 10.10.100.205/24
> > ipv4.gateway: 10.10.100.254
> > ipv4.routes: --
> > ipv4.route-metric: -1
> > ipv4.route-table: 0 (unspec)
> > ipv4.routing-rules: --
> > ipv4.ignore-auto-routes: no
> > ipv4.ignore-auto-dns: no
> > ipv4.dhcp-client-id: --
> > ipv4.dhcp-iaid: --
> > ipv4.dhcp-timeout: 0 (default)
> > ipv4.dhcp-send-hostname: yes
> > ipv4.dhcp-hostname: --
> > ipv4.dhcp-fqdn: --
> > ipv4.dhcp-hostname-flags: 0x0 (none)
> > ipv4.never-default: no
> > ipv4.may-fail: no
> > ipv4.dad-timeout: -1 (default)
> > -------------------------------------------------------------------------------
> > ipv6.method: ignore
> > ipv6.dns: --
> > ipv6.dns-search: --
> > ipv6.dns-options: --
> > ipv6.dns-priority: 0
> > ipv6.addresses: --
> > ipv6.gateway: --
> > ipv6.routes: --
> > ipv6.route-metric: -1
> > ipv6.route-table: 0 (unspec)
> > ipv6.routing-rules: --
> > ipv6.ignore-auto-routes: no
> > ipv6.ignore-auto-dns: no
> > ipv6.never-default: no
> > ipv6.may-fail: yes
> > ipv6.ip6-privacy: 0 (disabled)
> > ipv6.addr-gen-mode: stable-privacy
> > ipv6.ra-timeout: 0 (default)
> > ipv6.dhcp-duid: --
> > ipv6.dhcp-iaid: --
> > ipv6.dhcp-timeout: 0 (default)
> > ipv6.dhcp-send-hostname: yes
> > ipv6.dhcp-hostname: --
> > ipv6.dhcp-hostname-flags: 0x0 (none)
> > ipv6.token: --
> > -------------------------------------------------------------------------------
> > proxy.method: none
> > proxy.browser-only: no
> > proxy.pac-url: --
> > proxy.pac-script: --
> > -------------------------------------------------------------------------------
> > nmcli>
> >
> >
> > Felix
> >
> > On 22/09/2020 14:35, Simon Matter wrote:
> >>> Dear Simon,
> >>>
> >>>
> >>>> And can you diff the config of eno1 and eno4.
> >>> # pwd
> >>> /etc/sysconfig/network-scripts
> >> Okay, nothing to find here.
> >>
> >> What about eno2, you also have two IP addresses there and even in the
> >> same
> >> subnet, is this wanted or not? Can the second address of eno2 be found
> >> in
> >> the ifcfg file?
> >>
> >> Both eno2 and eno4 have "scope global secondary dynamic" with the
> >> second
> >> address and it doesn't seem to come from the base configuration.
> >>
> >> Simon
> >>
> >>> # diff -u ifcfg-eno1 ifcfg-eno4
> >>> --- ifcfg-eno1 2020-09-21 17:23:25.576672703 +0200
> >>> +++ ifcfg-eno4 2020-09-22 07:18:43.160532532 +0200
> >>> @@ -3,15 +3,20 @@
> >>> BROWSER_ONLY=no
> >>> BOOTPROTO=none
> >>> DEFROUTE=no
> >>> -IPV4_FAILURE_FATAL=yes
> >>> -IPV6INIT=no
> >>> -IPV6_AUTOCONF=no
> >>> +IPV4_FAILURE_FATAL=no
> >>> +IPV6INIT=yes
> >>> +IPV6_AUTOCONF=yes
> >>> IPV6_DEFROUTE=no
> >>> IPV6_FAILURE_FATAL=no
> >>> IPV6_ADDR_GEN_MODE=stable-privacy
> >>> -NAME=eno1
> >>> -UUID=1e382037-fec9-493d-a4f2-ace7d73a1e7b
> >>> -DEVICE=eno1
> >>> +NAME=eno4
> >>> +UUID=dbd95c24-1ed7-4292-8dba-3934bd1476a0
> >>> +DEVICE=eno4
> >>> ONBOOT=yes
> >>> -IPADDR=192.168.1.90
> >>> +IPADDR=192.168.2.98
> >>> PREFIX=24
> >>> +DNS1=10.10.100.1
> >>> +DNS2=10.10.100.2
> >>> +#DNS3=8.8.8.8
> >>> +PEERDNS=no
> >>> +PEERROUTES=no
> >>>
> >>>> Can you show the config of eno4?
> >>> # cat ifcfg-eno4
> >>> TYPE=Ethernet
> >>> PROXY_METHOD=none
> >>> BROWSER_ONLY=no
> >>> BOOTPROTO=none
> >>> DEFROUTE=no
> >>> IPV4_FAILURE_FATAL=no
> >>> IPV6INIT=yes
> >>> IPV6_AUTOCONF=yes
> >>> IPV6_DEFROUTE=no
> >>> IPV6_FAILURE_FATAL=no
> >>> IPV6_ADDR_GEN_MODE=stable-privacy
> >>> NAME=eno4
> >>> UUID=dbd95c24-1ed7-4292-8dba-3934bd1476a0
> >>> DEVICE=eno4
> >>> ONBOOT=yes
> >>> IPADDR=192.168.2.98
> >>> PREFIX=24
> >>> DNS1=10.10.100.1
> >>> DNS2=10.10.100.2
> >>> #DNS3=8.8.8.8
> >>> PEERDNS=no
> >>> PEERROUTES=no
> >>>
> >>> Regards,
> >>>
> >>> Felix
> >>>
> >>> _______________________________________________
> >>> CentOS mailing list
> >>> CentOS@xxxxxxxxxx
> >>> https://lists.centos.org/mailman/listinfo/centos
> >>>
> >>
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> >
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>
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