Ubuntu 18.04 minimal server has two IP addresses!Second IP via DHCP. Why?ubuntu 18.04: not releasing old IPs from DHCP14.04 no internet connection when I up the bridge interface (for LXC container)Dual NIC not workingCannot find device “eth0”. Failed to bring up eth0Pages loading too long on new router (Ubuntu 18.04)

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Ubuntu 18.04 minimal server has two IP addresses!


Second IP via DHCP. Why?ubuntu 18.04: not releasing old IPs from DHCP14.04 no internet connection when I up the bridge interface (for LXC container)Dual NIC not workingCannot find device “eth0”. Failed to bring up eth0Pages loading too long on new router (Ubuntu 18.04)






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margin-bottom:0;









2

















I'm seeing two different IP addresses on my Odroid XU4. I only noticed after I set up a Unifi controller on the box, but then tried to ssh into both of the addresses with success. I only want 192.168.2.3, and no IPv6.



mike@odroid:~$ ip addr show
1: lo: 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: eth0: mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether 00:1e:06:30:1e:f5 brd ff:ff:ff:ff:ff:ff
inet 192.168.2.3/24 brd 192.168.2.255 scope global dynamic noprefixroute eth0
valid_lft 3069558340sec preferred_lft 3069558340sec
inet 192.168.2.9/24 brd 192.168.2.255 scope global secondary eth0
valid_lft forever preferred_lft forever

mike@odroid:~$ ifconfig
eth0: flags=4163 mtu 1500
inet 192.168.2.3 netmask 255.255.255.0 broadcast 192.168.2.255
ether 00:1e:06:30:1e:f5 txqueuelen 1000 (Ethernet)
RX packets 12821 bytes 2393432 (2.3 MB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 13336 bytes 9323830 (9.3 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

lo: flags=73 mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10
loop txqueuelen 1000 (Local Loopback)
RX packets 10593 bytes 4855090 (4.8 MB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 10593 bytes 4855090 (4.8 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0


As we can see here eth0 has two IP address and is only shown by ip command and not by ifconfig. I am unable to understand where this is coming from or how to disable the 2nd IP permanently. I would like to get rid of the 2nd IP address permanently.



mike@odroid:~$ cat /etc/network/interfaces
# interfaces(5) file used by ifup(8) and ifdown(8)
# Include files from /etc/network/interfaces.d:
source-directory /etc/network/interfaces.d

mike@odroid:~$ cat /etc/netplan/*.yaml
cat: '/etc/netplan/*.yaml': No such file or directory









share|improve this question




























  • eth0 seems unusual for an interface in 18.04. Please edit your question to add the result of the terminal commands: cat /etc/network/interfaces and also: cat /etc/netplan/*.yaml Welcome to Ask Ubuntu.

    – chili555
    Aug 17 '18 at 20:14











  • mike@odroid:~$ cat /etc/network/interfaces # interfaces(5) file used by ifup(8) and ifdown(8) # Include files from /etc/network/interfaces.d: source-directory /etc/network/interfaces.d

    – Mike Tarbox
    Aug 23 '18 at 13:48











  • mike@odroid:~$ cat /etc/netplan/*.yaml cat: '/etc/netplan/*.yaml': No such file or directory

    – Mike Tarbox
    Aug 23 '18 at 13:49






  • 2





    Are you 100% certain this is Ubuntu 18.04? What's the output of lsb_release -a (to confirm the version of Ubuntu you're using)? Have you checked /etc/network/interfaces.d/ for any configuration items there that might be the network config?

    – Thomas Ward
    Aug 23 '18 at 14:17











  • mike@odroid:~$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 18.04.1 LTS Release: 18.04 Codename: bionic

    – Mike Tarbox
    Aug 23 '18 at 14:25

















2

















I'm seeing two different IP addresses on my Odroid XU4. I only noticed after I set up a Unifi controller on the box, but then tried to ssh into both of the addresses with success. I only want 192.168.2.3, and no IPv6.



mike@odroid:~$ ip addr show
1: lo: 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: eth0: mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether 00:1e:06:30:1e:f5 brd ff:ff:ff:ff:ff:ff
inet 192.168.2.3/24 brd 192.168.2.255 scope global dynamic noprefixroute eth0
valid_lft 3069558340sec preferred_lft 3069558340sec
inet 192.168.2.9/24 brd 192.168.2.255 scope global secondary eth0
valid_lft forever preferred_lft forever

mike@odroid:~$ ifconfig
eth0: flags=4163 mtu 1500
inet 192.168.2.3 netmask 255.255.255.0 broadcast 192.168.2.255
ether 00:1e:06:30:1e:f5 txqueuelen 1000 (Ethernet)
RX packets 12821 bytes 2393432 (2.3 MB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 13336 bytes 9323830 (9.3 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

lo: flags=73 mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10
loop txqueuelen 1000 (Local Loopback)
RX packets 10593 bytes 4855090 (4.8 MB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 10593 bytes 4855090 (4.8 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0


As we can see here eth0 has two IP address and is only shown by ip command and not by ifconfig. I am unable to understand where this is coming from or how to disable the 2nd IP permanently. I would like to get rid of the 2nd IP address permanently.



mike@odroid:~$ cat /etc/network/interfaces
# interfaces(5) file used by ifup(8) and ifdown(8)
# Include files from /etc/network/interfaces.d:
source-directory /etc/network/interfaces.d

mike@odroid:~$ cat /etc/netplan/*.yaml
cat: '/etc/netplan/*.yaml': No such file or directory









share|improve this question




























  • eth0 seems unusual for an interface in 18.04. Please edit your question to add the result of the terminal commands: cat /etc/network/interfaces and also: cat /etc/netplan/*.yaml Welcome to Ask Ubuntu.

    – chili555
    Aug 17 '18 at 20:14











  • mike@odroid:~$ cat /etc/network/interfaces # interfaces(5) file used by ifup(8) and ifdown(8) # Include files from /etc/network/interfaces.d: source-directory /etc/network/interfaces.d

    – Mike Tarbox
    Aug 23 '18 at 13:48











  • mike@odroid:~$ cat /etc/netplan/*.yaml cat: '/etc/netplan/*.yaml': No such file or directory

    – Mike Tarbox
    Aug 23 '18 at 13:49






  • 2





    Are you 100% certain this is Ubuntu 18.04? What's the output of lsb_release -a (to confirm the version of Ubuntu you're using)? Have you checked /etc/network/interfaces.d/ for any configuration items there that might be the network config?

    – Thomas Ward
    Aug 23 '18 at 14:17











  • mike@odroid:~$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 18.04.1 LTS Release: 18.04 Codename: bionic

    – Mike Tarbox
    Aug 23 '18 at 14:25













2












2








2








I'm seeing two different IP addresses on my Odroid XU4. I only noticed after I set up a Unifi controller on the box, but then tried to ssh into both of the addresses with success. I only want 192.168.2.3, and no IPv6.



mike@odroid:~$ ip addr show
1: lo: 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: eth0: mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether 00:1e:06:30:1e:f5 brd ff:ff:ff:ff:ff:ff
inet 192.168.2.3/24 brd 192.168.2.255 scope global dynamic noprefixroute eth0
valid_lft 3069558340sec preferred_lft 3069558340sec
inet 192.168.2.9/24 brd 192.168.2.255 scope global secondary eth0
valid_lft forever preferred_lft forever

mike@odroid:~$ ifconfig
eth0: flags=4163 mtu 1500
inet 192.168.2.3 netmask 255.255.255.0 broadcast 192.168.2.255
ether 00:1e:06:30:1e:f5 txqueuelen 1000 (Ethernet)
RX packets 12821 bytes 2393432 (2.3 MB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 13336 bytes 9323830 (9.3 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

lo: flags=73 mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10
loop txqueuelen 1000 (Local Loopback)
RX packets 10593 bytes 4855090 (4.8 MB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 10593 bytes 4855090 (4.8 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0


As we can see here eth0 has two IP address and is only shown by ip command and not by ifconfig. I am unable to understand where this is coming from or how to disable the 2nd IP permanently. I would like to get rid of the 2nd IP address permanently.



mike@odroid:~$ cat /etc/network/interfaces
# interfaces(5) file used by ifup(8) and ifdown(8)
# Include files from /etc/network/interfaces.d:
source-directory /etc/network/interfaces.d

mike@odroid:~$ cat /etc/netplan/*.yaml
cat: '/etc/netplan/*.yaml': No such file or directory









share|improve this question

















I'm seeing two different IP addresses on my Odroid XU4. I only noticed after I set up a Unifi controller on the box, but then tried to ssh into both of the addresses with success. I only want 192.168.2.3, and no IPv6.



mike@odroid:~$ ip addr show
1: lo: 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: eth0: mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether 00:1e:06:30:1e:f5 brd ff:ff:ff:ff:ff:ff
inet 192.168.2.3/24 brd 192.168.2.255 scope global dynamic noprefixroute eth0
valid_lft 3069558340sec preferred_lft 3069558340sec
inet 192.168.2.9/24 brd 192.168.2.255 scope global secondary eth0
valid_lft forever preferred_lft forever

mike@odroid:~$ ifconfig
eth0: flags=4163 mtu 1500
inet 192.168.2.3 netmask 255.255.255.0 broadcast 192.168.2.255
ether 00:1e:06:30:1e:f5 txqueuelen 1000 (Ethernet)
RX packets 12821 bytes 2393432 (2.3 MB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 13336 bytes 9323830 (9.3 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

lo: flags=73 mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10
loop txqueuelen 1000 (Local Loopback)
RX packets 10593 bytes 4855090 (4.8 MB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 10593 bytes 4855090 (4.8 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0


As we can see here eth0 has two IP address and is only shown by ip command and not by ifconfig. I am unable to understand where this is coming from or how to disable the 2nd IP permanently. I would like to get rid of the 2nd IP address permanently.



mike@odroid:~$ cat /etc/network/interfaces
# interfaces(5) file used by ifup(8) and ifdown(8)
# Include files from /etc/network/interfaces.d:
source-directory /etc/network/interfaces.d

mike@odroid:~$ cat /etc/netplan/*.yaml
cat: '/etc/netplan/*.yaml': No such file or directory






networking server ethernet dhcp






share|improve this question
















share|improve this question













share|improve this question




share|improve this question








edited Aug 23 '18 at 14:24









Melebius

7,4275 gold badges29 silver badges54 bronze badges




7,4275 gold badges29 silver badges54 bronze badges










asked Aug 17 '18 at 18:36









Mike TarboxMike Tarbox

114 bronze badges




114 bronze badges















  • eth0 seems unusual for an interface in 18.04. Please edit your question to add the result of the terminal commands: cat /etc/network/interfaces and also: cat /etc/netplan/*.yaml Welcome to Ask Ubuntu.

    – chili555
    Aug 17 '18 at 20:14











  • mike@odroid:~$ cat /etc/network/interfaces # interfaces(5) file used by ifup(8) and ifdown(8) # Include files from /etc/network/interfaces.d: source-directory /etc/network/interfaces.d

    – Mike Tarbox
    Aug 23 '18 at 13:48











  • mike@odroid:~$ cat /etc/netplan/*.yaml cat: '/etc/netplan/*.yaml': No such file or directory

    – Mike Tarbox
    Aug 23 '18 at 13:49






  • 2





    Are you 100% certain this is Ubuntu 18.04? What's the output of lsb_release -a (to confirm the version of Ubuntu you're using)? Have you checked /etc/network/interfaces.d/ for any configuration items there that might be the network config?

    – Thomas Ward
    Aug 23 '18 at 14:17











  • mike@odroid:~$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 18.04.1 LTS Release: 18.04 Codename: bionic

    – Mike Tarbox
    Aug 23 '18 at 14:25

















  • eth0 seems unusual for an interface in 18.04. Please edit your question to add the result of the terminal commands: cat /etc/network/interfaces and also: cat /etc/netplan/*.yaml Welcome to Ask Ubuntu.

    – chili555
    Aug 17 '18 at 20:14











  • mike@odroid:~$ cat /etc/network/interfaces # interfaces(5) file used by ifup(8) and ifdown(8) # Include files from /etc/network/interfaces.d: source-directory /etc/network/interfaces.d

    – Mike Tarbox
    Aug 23 '18 at 13:48











  • mike@odroid:~$ cat /etc/netplan/*.yaml cat: '/etc/netplan/*.yaml': No such file or directory

    – Mike Tarbox
    Aug 23 '18 at 13:49






  • 2





    Are you 100% certain this is Ubuntu 18.04? What's the output of lsb_release -a (to confirm the version of Ubuntu you're using)? Have you checked /etc/network/interfaces.d/ for any configuration items there that might be the network config?

    – Thomas Ward
    Aug 23 '18 at 14:17











  • mike@odroid:~$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 18.04.1 LTS Release: 18.04 Codename: bionic

    – Mike Tarbox
    Aug 23 '18 at 14:25
















eth0 seems unusual for an interface in 18.04. Please edit your question to add the result of the terminal commands: cat /etc/network/interfaces and also: cat /etc/netplan/*.yaml Welcome to Ask Ubuntu.

– chili555
Aug 17 '18 at 20:14





eth0 seems unusual for an interface in 18.04. Please edit your question to add the result of the terminal commands: cat /etc/network/interfaces and also: cat /etc/netplan/*.yaml Welcome to Ask Ubuntu.

– chili555
Aug 17 '18 at 20:14













mike@odroid:~$ cat /etc/network/interfaces # interfaces(5) file used by ifup(8) and ifdown(8) # Include files from /etc/network/interfaces.d: source-directory /etc/network/interfaces.d

– Mike Tarbox
Aug 23 '18 at 13:48





mike@odroid:~$ cat /etc/network/interfaces # interfaces(5) file used by ifup(8) and ifdown(8) # Include files from /etc/network/interfaces.d: source-directory /etc/network/interfaces.d

– Mike Tarbox
Aug 23 '18 at 13:48













mike@odroid:~$ cat /etc/netplan/*.yaml cat: '/etc/netplan/*.yaml': No such file or directory

– Mike Tarbox
Aug 23 '18 at 13:49





mike@odroid:~$ cat /etc/netplan/*.yaml cat: '/etc/netplan/*.yaml': No such file or directory

– Mike Tarbox
Aug 23 '18 at 13:49




2




2





Are you 100% certain this is Ubuntu 18.04? What's the output of lsb_release -a (to confirm the version of Ubuntu you're using)? Have you checked /etc/network/interfaces.d/ for any configuration items there that might be the network config?

– Thomas Ward
Aug 23 '18 at 14:17





Are you 100% certain this is Ubuntu 18.04? What's the output of lsb_release -a (to confirm the version of Ubuntu you're using)? Have you checked /etc/network/interfaces.d/ for any configuration items there that might be the network config?

– Thomas Ward
Aug 23 '18 at 14:17













mike@odroid:~$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 18.04.1 LTS Release: 18.04 Codename: bionic

– Mike Tarbox
Aug 23 '18 at 14:25





mike@odroid:~$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 18.04.1 LTS Release: 18.04 Codename: bionic

– Mike Tarbox
Aug 23 '18 at 14:25










1 Answer
1






active

oldest

votes


















2


















I have struggled with this exact same problem and every search comes up with several others experiencing the same issue with no resolution.



FINALLY, here is what solved it for me:



ip addr flush dev <your_adapter_id>


for me it was



ip addr flush dev enp0s4


This kills the secondary IP.






share|improve this answer


























  • I suspect this issue may be due to previous failed dhcp lease not being released by the system, hence why flushing config works. Since this post is unlikely to be revisited by OP to confirm +1ed this post for effort to resolve and for providing what appears to be appropriate solution

    – Sergiy Kolodyazhnyy
    May 30 at 4:57











  • Actually I did log in to see the response. I ended up switching over to 16.04. I was using the odroid to run pi-hole, or at least attempting to. I ended up using the odroid to run my unifi controller instead.

    – Mike Tarbox
    May 31 at 23:41












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1 Answer
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active

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1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









2


















I have struggled with this exact same problem and every search comes up with several others experiencing the same issue with no resolution.



FINALLY, here is what solved it for me:



ip addr flush dev <your_adapter_id>


for me it was



ip addr flush dev enp0s4


This kills the secondary IP.






share|improve this answer


























  • I suspect this issue may be due to previous failed dhcp lease not being released by the system, hence why flushing config works. Since this post is unlikely to be revisited by OP to confirm +1ed this post for effort to resolve and for providing what appears to be appropriate solution

    – Sergiy Kolodyazhnyy
    May 30 at 4:57











  • Actually I did log in to see the response. I ended up switching over to 16.04. I was using the odroid to run pi-hole, or at least attempting to. I ended up using the odroid to run my unifi controller instead.

    – Mike Tarbox
    May 31 at 23:41















2


















I have struggled with this exact same problem and every search comes up with several others experiencing the same issue with no resolution.



FINALLY, here is what solved it for me:



ip addr flush dev <your_adapter_id>


for me it was



ip addr flush dev enp0s4


This kills the secondary IP.






share|improve this answer


























  • I suspect this issue may be due to previous failed dhcp lease not being released by the system, hence why flushing config works. Since this post is unlikely to be revisited by OP to confirm +1ed this post for effort to resolve and for providing what appears to be appropriate solution

    – Sergiy Kolodyazhnyy
    May 30 at 4:57











  • Actually I did log in to see the response. I ended up switching over to 16.04. I was using the odroid to run pi-hole, or at least attempting to. I ended up using the odroid to run my unifi controller instead.

    – Mike Tarbox
    May 31 at 23:41













2














2










2









I have struggled with this exact same problem and every search comes up with several others experiencing the same issue with no resolution.



FINALLY, here is what solved it for me:



ip addr flush dev <your_adapter_id>


for me it was



ip addr flush dev enp0s4


This kills the secondary IP.






share|improve this answer














I have struggled with this exact same problem and every search comes up with several others experiencing the same issue with no resolution.



FINALLY, here is what solved it for me:



ip addr flush dev <your_adapter_id>


for me it was



ip addr flush dev enp0s4


This kills the secondary IP.







share|improve this answer













share|improve this answer




share|improve this answer










answered May 30 at 3:25









Zach ToundasZach Toundas

212 bronze badges




212 bronze badges















  • I suspect this issue may be due to previous failed dhcp lease not being released by the system, hence why flushing config works. Since this post is unlikely to be revisited by OP to confirm +1ed this post for effort to resolve and for providing what appears to be appropriate solution

    – Sergiy Kolodyazhnyy
    May 30 at 4:57











  • Actually I did log in to see the response. I ended up switching over to 16.04. I was using the odroid to run pi-hole, or at least attempting to. I ended up using the odroid to run my unifi controller instead.

    – Mike Tarbox
    May 31 at 23:41

















  • I suspect this issue may be due to previous failed dhcp lease not being released by the system, hence why flushing config works. Since this post is unlikely to be revisited by OP to confirm +1ed this post for effort to resolve and for providing what appears to be appropriate solution

    – Sergiy Kolodyazhnyy
    May 30 at 4:57











  • Actually I did log in to see the response. I ended up switching over to 16.04. I was using the odroid to run pi-hole, or at least attempting to. I ended up using the odroid to run my unifi controller instead.

    – Mike Tarbox
    May 31 at 23:41
















I suspect this issue may be due to previous failed dhcp lease not being released by the system, hence why flushing config works. Since this post is unlikely to be revisited by OP to confirm +1ed this post for effort to resolve and for providing what appears to be appropriate solution

– Sergiy Kolodyazhnyy
May 30 at 4:57





I suspect this issue may be due to previous failed dhcp lease not being released by the system, hence why flushing config works. Since this post is unlikely to be revisited by OP to confirm +1ed this post for effort to resolve and for providing what appears to be appropriate solution

– Sergiy Kolodyazhnyy
May 30 at 4:57













Actually I did log in to see the response. I ended up switching over to 16.04. I was using the odroid to run pi-hole, or at least attempting to. I ended up using the odroid to run my unifi controller instead.

– Mike Tarbox
May 31 at 23:41





Actually I did log in to see the response. I ended up switching over to 16.04. I was using the odroid to run pi-hole, or at least attempting to. I ended up using the odroid to run my unifi controller instead.

– Mike Tarbox
May 31 at 23:41


















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