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Second IP via DHCP. Why? [duplicate]

Ubuntu 18.04 minimal server has two IP addresses!how to configure dhcp?14.04 no internet connection when I up the bridge interface (for LXC container)Raspberry Pi 3B with Ubuntu Server(CLI) with No Ethernet Recognition and No Wlan0 ListHow to enable wireless on Ubuntu Server 18.04 via CLI?

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0

This question already has an answer here:

• 
  Ubuntu 18.04 minimal server has two IP addresses!
  
  1 answer
  
  

I have a secondary IP on my ens160 interface and I don't know why :) System is Ubuntu 17.10. Any hints where to dig here?

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: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
 link/ether 00:0c:29:07:bd:e3 brd ff:ff:ff:ff:ff:ff
 inet 192.168.0.5/24 brd 192.168.0.255 scope global ens160
 valid_lft forever preferred_lft forever
 inet 192.168.0.165/24 brd 192.168.0.255 scope global secondary ens160
 valid_lft forever preferred_lft forever
 inet6 fe80::20c:29ff:fe07:bde3/64 scope link
 valid_lft forever preferred_lft forever

192.168.0.5 is my static ip, configured via netplan:

network:
 version: 2
 renderer: networkd
 ethernets:
 ens160:
 dhcp4: no
 dhcp6: no
 addresses: [192.168.0.5/24]
 gateway4: 192.168.0.254
 nameservers:
 addresses: [8.8.8.8,1.1.1.1]

networking dhcp static-ip netplan

share|improve this question

edited May 30 at 5:44

Zanna

53.5k1515 gold badges150150 silver badges252252 bronze badges

asked May 2 '18 at 8:08

ContiConti

111 bronze badge

marked as duplicate by Sergiy Kolodyazhnyy, dessert, Zanna, karel, Kulfy May 30 at 6:48

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I think the secondary address is configured statically somewhere. A DHCP assigned address seem to contain the keyword dynamic (ie. inet 192.168.0.165/24 brd 192.168.0.255 scope global dynamic secondary ens160). Your output of the command ip addr doesn't.
  
  – user822833
  May 2 '18 at 16:25
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Check out these locations for configurations files that might cause your problem: /run/netplan/*.yaml, /etc/netplan/*.yaml and /lib/netplan/*.yaml.
  
  – user822833
  May 2 '18 at 16:29
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I will check these files. But its clearly DHCP, because I see the lease in my DHCP server. And, maybe thats the trick, I added a denyinterfaces ens160 to the /etc/dhcpcd.conf file. But why is this file triggered and where?
  
  – Conti
  May 3 '18 at 21:02
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Can you see in the DHCP log that 192.168.0.165 is leased to the MAC address 00:0c:29:07:bd:e3?
  
  – user822833
  May 4 '18 at 5:38
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  May 02 10:39:15 pihole systemd[1]: Starting LSB: IPv4 DHCP client with IPv4LL support... May 02 10:39:16 pihole dhcpcd[1310]: ens160: soliciting a DHCP lease May 02 10:39:17 pihole dhcpcd[1310]: ens160: offered 192.168.0.165 from 192.168.0.254 May 02 10:39:17 pihole dhcpcd[1310]: ens160: probing address 192.168.0.165/24 May 02 10:39:23 pihole dhcpcd[1310]: ens160: leased 192.168.0.165 for 3600 seconds May 02 10:39:23 pihole dhcpcd[1310]: ens160: adding route to 192.168.0.0/24
  
  – Conti
  May 7 '18 at 8:53
  
  

  
  
  
  

add a comment
 | 

0

This question already has an answer here:

• 
  Ubuntu 18.04 minimal server has two IP addresses!
  
  1 answer
  
  

I have a secondary IP on my ens160 interface and I don't know why :) System is Ubuntu 17.10. Any hints where to dig here?

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: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
 link/ether 00:0c:29:07:bd:e3 brd ff:ff:ff:ff:ff:ff
 inet 192.168.0.5/24 brd 192.168.0.255 scope global ens160
 valid_lft forever preferred_lft forever
 inet 192.168.0.165/24 brd 192.168.0.255 scope global secondary ens160
 valid_lft forever preferred_lft forever
 inet6 fe80::20c:29ff:fe07:bde3/64 scope link
 valid_lft forever preferred_lft forever

192.168.0.5 is my static ip, configured via netplan:

network:
 version: 2
 renderer: networkd
 ethernets:
 ens160:
 dhcp4: no
 dhcp6: no
 addresses: [192.168.0.5/24]
 gateway4: 192.168.0.254
 nameservers:
 addresses: [8.8.8.8,1.1.1.1]

networking dhcp static-ip netplan

share|improve this question

edited May 30 at 5:44

Zanna

53.5k1515 gold badges150150 silver badges252252 bronze badges

asked May 2 '18 at 8:08

ContiConti

111 bronze badge

marked as duplicate by Sergiy Kolodyazhnyy, dessert, Zanna, karel, Kulfy May 30 at 6:48

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I think the secondary address is configured statically somewhere. A DHCP assigned address seem to contain the keyword dynamic (ie. inet 192.168.0.165/24 brd 192.168.0.255 scope global dynamic secondary ens160). Your output of the command ip addr doesn't.
  
  – user822833
  May 2 '18 at 16:25
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Check out these locations for configurations files that might cause your problem: /run/netplan/*.yaml, /etc/netplan/*.yaml and /lib/netplan/*.yaml.
  
  – user822833
  May 2 '18 at 16:29
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I will check these files. But its clearly DHCP, because I see the lease in my DHCP server. And, maybe thats the trick, I added a denyinterfaces ens160 to the /etc/dhcpcd.conf file. But why is this file triggered and where?
  
  – Conti
  May 3 '18 at 21:02
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Can you see in the DHCP log that 192.168.0.165 is leased to the MAC address 00:0c:29:07:bd:e3?
  
  – user822833
  May 4 '18 at 5:38
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  May 02 10:39:15 pihole systemd[1]: Starting LSB: IPv4 DHCP client with IPv4LL support... May 02 10:39:16 pihole dhcpcd[1310]: ens160: soliciting a DHCP lease May 02 10:39:17 pihole dhcpcd[1310]: ens160: offered 192.168.0.165 from 192.168.0.254 May 02 10:39:17 pihole dhcpcd[1310]: ens160: probing address 192.168.0.165/24 May 02 10:39:23 pihole dhcpcd[1310]: ens160: leased 192.168.0.165 for 3600 seconds May 02 10:39:23 pihole dhcpcd[1310]: ens160: adding route to 192.168.0.0/24
  
  – Conti
  May 7 '18 at 8:53
  
  

  
  
  
  

add a comment
 | 

This question already has an answer here:

• 
  Ubuntu 18.04 minimal server has two IP addresses!
  
  1 answer
  
  

I have a secondary IP on my ens160 interface and I don't know why :) System is Ubuntu 17.10. Any hints where to dig here?

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: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
 link/ether 00:0c:29:07:bd:e3 brd ff:ff:ff:ff:ff:ff
 inet 192.168.0.5/24 brd 192.168.0.255 scope global ens160
 valid_lft forever preferred_lft forever
 inet 192.168.0.165/24 brd 192.168.0.255 scope global secondary ens160
 valid_lft forever preferred_lft forever
 inet6 fe80::20c:29ff:fe07:bde3/64 scope link
 valid_lft forever preferred_lft forever

192.168.0.5 is my static ip, configured via netplan:

network:
 version: 2
 renderer: networkd
 ethernets:
 ens160:
 dhcp4: no
 dhcp6: no
 addresses: [192.168.0.5/24]
 gateway4: 192.168.0.254
 nameservers:
 addresses: [8.8.8.8,1.1.1.1]

networking dhcp static-ip netplan

share|improve this question

edited May 30 at 5:44

Zanna

53.5k1515 gold badges150150 silver badges252252 bronze badges

asked May 2 '18 at 8:08

ContiConti

111 bronze badge

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: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
 link/ether 00:0c:29:07:bd:e3 brd ff:ff:ff:ff:ff:ff
 inet 192.168.0.5/24 brd 192.168.0.255 scope global ens160
 valid_lft forever preferred_lft forever
 inet 192.168.0.165/24 brd 192.168.0.255 scope global secondary ens160
 valid_lft forever preferred_lft forever
 inet6 fe80::20c:29ff:fe07:bde3/64 scope link
 valid_lft forever preferred_lft forever

network:
 version: 2
 renderer: networkd
 ethernets:
 ens160:
 dhcp4: no
 dhcp6: no
 addresses: [192.168.0.5/24]
 gateway4: 192.168.0.254
 nameservers:
 addresses: [8.8.8.8,1.1.1.1]

share|improve this question

edited May 30 at 5:44

Zanna

53.5k1515 gold badges150150 silver badges252252 bronze badges

asked May 2 '18 at 8:08

ContiConti

111 bronze badge

share|improve this question

edited May 30 at 5:44

Zanna

53.5k1515 gold badges150150 silver badges252252 bronze badges

asked May 2 '18 at 8:08

ContiConti

111 bronze badge

edited May 30 at 5:44

Zanna

53.5k1515 gold badges150150 silver badges252252 bronze badges

edited May 30 at 5:44

Zanna

53.5k1515 gold badges150150 silver badges252252 bronze badges

asked May 2 '18 at 8:08

ContiConti

111 bronze badge

asked May 2 '18 at 8:08

ContiConti

111 bronze badge

1 Answer
1

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oldest

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0

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

...then reboot.

sudo shutdown -r

This kills the secondary IP.

share|improve this answer

answered May 30 at 3:42

Zach ToundasZach Toundas

2122 bronze badges

add a comment
 | 

0

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

...then reboot.

sudo shutdown -r

This kills the secondary IP.

share|improve this answer

answered May 30 at 3:42

Zach ToundasZach Toundas

2122 bronze badges

add a comment
 | 

0

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

...then reboot.

sudo shutdown -r

This kills the secondary IP.

share|improve this answer

answered May 30 at 3:42

Zach ToundasZach Toundas

2122 bronze badges

add a comment
 | 

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

...then reboot.

sudo shutdown -r

This kills the secondary IP.

share|improve this answer

answered May 30 at 3:42

Zach ToundasZach Toundas

2122 bronze badges

ip addr flush dev <your_adapter_id>

ip addr flush dev enp0s4

sudo shutdown -r

share|improve this answer

answered May 30 at 3:42

Zach ToundasZach Toundas

2122 bronze badges

answered May 30 at 3:42

Zach ToundasZach Toundas

2122 bronze badges

answered May 30 at 3:42

Zach ToundasZach Toundas

2122 bronze badges