How to add a static secondary IP to a DHCP interface using netplan?

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1
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My server has a file /etc/netplan/50-cloud-init.yaml with the following content:

# This file is generated from information provided by
# the datasource. Changes to it will not persist across an instance.
# To disable cloud-init's network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: config: disabled
network:
 version: 2
 ethernets:
 ens3:
 dhcp4: true
 match:
 macaddress: fa:**:**:**:**:**
 set-name: ens3

This results in the following interface configuration:

2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc fq_codel state UP group default qlen 1000
 link/ether fa:**:**:**:**:** brd ff:ff:ff:ff:ff:ff
 inet 10.0.0.5/24 brd 10.0.0.255 scope global dynamic ens3
 ...

So far, so good. But now I need to add 10.0.0.250 as an additional secondary static IP to this interface. What is the best way to do that? I created a new file /etc/netplan/60-service-ip.yaml with:

network:
 version: 2
 ethernets:
 ens3:
 addresses:
 - 10.0.0.5/24
 - 10.0.0.250/24

This seems to work, but it re-defines a dynamic IP as a static one.

asked 49 mins ago

Torsten Bronger

1277

add a commentÂ |Â

up vote
1
down vote

favorite

My server has a file /etc/netplan/50-cloud-init.yaml with the following content:

# This file is generated from information provided by
# the datasource. Changes to it will not persist across an instance.
# To disable cloud-init's network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: config: disabled
network:
 version: 2
 ethernets:
 ens3:
 dhcp4: true
 match:
 macaddress: fa:**:**:**:**:**
 set-name: ens3

This results in the following interface configuration:

2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc fq_codel state UP group default qlen 1000
 link/ether fa:**:**:**:**:** brd ff:ff:ff:ff:ff:ff
 inet 10.0.0.5/24 brd 10.0.0.255 scope global dynamic ens3
 ...

So far, so good. But now I need to add 10.0.0.250 as an additional secondary static IP to this interface. What is the best way to do that? I created a new file /etc/netplan/60-service-ip.yaml with:

network:
 version: 2
 ethernets:
 ens3:
 addresses:
 - 10.0.0.5/24
 - 10.0.0.250/24

This seems to work, but it re-defines a dynamic IP as a static one.

asked 49 mins ago

Torsten Bronger

1277

add a commentÂ |Â

up vote
1
down vote

favorite

My server has a file /etc/netplan/50-cloud-init.yaml with the following content:

# This file is generated from information provided by
# the datasource. Changes to it will not persist across an instance.
# To disable cloud-init's network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: config: disabled
network:
 version: 2
 ethernets:
 ens3:
 dhcp4: true
 match:
 macaddress: fa:**:**:**:**:**
 set-name: ens3

This results in the following interface configuration:

2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc fq_codel state UP group default qlen 1000
 link/ether fa:**:**:**:**:** brd ff:ff:ff:ff:ff:ff
 inet 10.0.0.5/24 brd 10.0.0.255 scope global dynamic ens3
 ...

So far, so good. But now I need to add 10.0.0.250 as an additional secondary static IP to this interface. What is the best way to do that? I created a new file /etc/netplan/60-service-ip.yaml with:

network:
 version: 2
 ethernets:
 ens3:
 addresses:
 - 10.0.0.5/24
 - 10.0.0.250/24

This seems to work, but it re-defines a dynamic IP as a static one.

asked 49 mins ago

Torsten Bronger

1277

My server has a file /etc/netplan/50-cloud-init.yaml with the following content:

# This file is generated from information provided by
# the datasource. Changes to it will not persist across an instance.
# To disable cloud-init's network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: config: disabled
network:
 version: 2
 ethernets:
 ens3:
 dhcp4: true
 match:
 macaddress: fa:**:**:**:**:**
 set-name: ens3

This results in the following interface configuration:

2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc fq_codel state UP group default qlen 1000
 link/ether fa:**:**:**:**:** brd ff:ff:ff:ff:ff:ff
 inet 10.0.0.5/24 brd 10.0.0.255 scope global dynamic ens3
 ...

So far, so good. But now I need to add 10.0.0.250 as an additional secondary static IP to this interface. What is the best way to do that? I created a new file /etc/netplan/60-service-ip.yaml with:

network:
 version: 2
 ethernets:
 ens3:
 addresses:
 - 10.0.0.5/24
 - 10.0.0.250/24

This seems to work, but it re-defines a dynamic IP as a static one.

linux-networking dhcp static-ip netplan

asked 49 mins ago

Torsten Bronger

1277

asked 49 mins ago

Torsten Bronger

1277

asked 49 mins ago

Torsten Bronger

1277

asked 49 mins ago

Torsten Bronger

1277

asked 49 mins ago

Torsten Bronger

1277

add a commentÂ |Â

2 Answers
2

active

oldest

votes

up vote
1
down vote

Answered on Ask Ubuntu

Copy:

The solution was quite simple, just set a static IP address and enable DHCP. Basically you just have to add dhcp4: yes to your configuration.

This configuration gave me a primary static IP address and a secondary DHCP assigned IP address:

network:
 version: 2
 renderer: networkd
 ethernets:
 enp0s3:
 dhcp4: yes
 dhcp6: no
 addresses: 
 - 10.1.2.15/24
 gateway4: 10.1.2.1
 nameservers:
 search:
 - example.com
 addresses: [10.1.2.10]

The result of ip address show enp0s3 gave me:

2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
 link/ether 08:00:27:ab:cd:ef brd ff:ff:ff:ff:ff:ff
 inet 10.1.2.15/24 brd 10.0.1.255 scope global enp0s3
 valid_lft forever preferred_lft forever
 inet 10.1.2.96/24 brd 10.0.1.255 scope global secondary dynamic enp0s3
 valid_lft 3224sec preferred_lft 3224sec
 inet6 fe80::a00:27ff:fe20:2c40/64 scope link 
 valid_lft forever preferred_lft forever

The address 10.1.2.96 is the secondary DHCP assigned address as indicated by the secondary dynamic keywords.

answered 39 mins ago

Lenniey

1,9452718

Unfortunately, this results in the DHCP address being the secondary address. However, it needs to be primary in order to make outgoing connections work.
â€“Â Torsten Bronger
17 mins ago

Why does it have to be primary? Are you sure you don't just need source routing? or a different gateway per IP?
â€“Â Lenniey
10 mins ago

If the DHCP-based address is primary, everything works fine. If it is secondary, outgoing connections hang. See also bugs.launchpad.net/netplan/+bug/1766656, especially comment #2.
â€“Â Torsten Bronger
5 mins ago

add a commentÂ |Â

up vote
1
down vote

It's actually way easier, you just add dhcp4: true to your static configuration like this (and disable v6 if you don't need it):

network:
 version: 2
 ethernets:
 ens3:
 dhcp4: yes
 dhcp6: no
 addresses:
 - 10.0.0.5/24
 - 10.0.0.250/24

answered 38 mins ago

Broco

1,235618

Here, I still have to make the dynamic 10.0.0.5 a static one.
â€“Â Torsten Bronger
16 mins ago

That's exactly what this does, you have two static addresses 10.0.0.5/24 and 10.0.0.250/24 and get an additional dynamic ip.
â€“Â Broco
13 mins ago

But 10.0.0.5 comes from the DHCP server and I donÃ¢Â€Â™t know its value a priori.
â€“Â Torsten Bronger
4 mins ago

add a commentÂ |Â

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2 Answers
2

active

oldest

votes

2 Answers
2

active

oldest

votes

up vote
1
down vote

Answered on Ask Ubuntu

Copy:

The solution was quite simple, just set a static IP address and enable DHCP. Basically you just have to add dhcp4: yes to your configuration.

This configuration gave me a primary static IP address and a secondary DHCP assigned IP address:

network:
 version: 2
 renderer: networkd
 ethernets:
 enp0s3:
 dhcp4: yes
 dhcp6: no
 addresses: 
 - 10.1.2.15/24
 gateway4: 10.1.2.1
 nameservers:
 search:
 - example.com
 addresses: [10.1.2.10]

The result of ip address show enp0s3 gave me:

2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
 link/ether 08:00:27:ab:cd:ef brd ff:ff:ff:ff:ff:ff
 inet 10.1.2.15/24 brd 10.0.1.255 scope global enp0s3
 valid_lft forever preferred_lft forever
 inet 10.1.2.96/24 brd 10.0.1.255 scope global secondary dynamic enp0s3
 valid_lft 3224sec preferred_lft 3224sec
 inet6 fe80::a00:27ff:fe20:2c40/64 scope link 
 valid_lft forever preferred_lft forever

The address 10.1.2.96 is the secondary DHCP assigned address as indicated by the secondary dynamic keywords.

answered 39 mins ago

Lenniey

1,9452718

Unfortunately, this results in the DHCP address being the secondary address. However, it needs to be primary in order to make outgoing connections work.
â€“Â Torsten Bronger
17 mins ago

Why does it have to be primary? Are you sure you don't just need source routing? or a different gateway per IP?
â€“Â Lenniey
10 mins ago

If the DHCP-based address is primary, everything works fine. If it is secondary, outgoing connections hang. See also bugs.launchpad.net/netplan/+bug/1766656, especially comment #2.
â€“Â Torsten Bronger
5 mins ago

add a commentÂ |Â

up vote
1
down vote

Answered on Ask Ubuntu

Copy:

The solution was quite simple, just set a static IP address and enable DHCP. Basically you just have to add dhcp4: yes to your configuration.

This configuration gave me a primary static IP address and a secondary DHCP assigned IP address:

network:
 version: 2
 renderer: networkd
 ethernets:
 enp0s3:
 dhcp4: yes
 dhcp6: no
 addresses: 
 - 10.1.2.15/24
 gateway4: 10.1.2.1
 nameservers:
 search:
 - example.com
 addresses: [10.1.2.10]

The result of ip address show enp0s3 gave me:

2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
 link/ether 08:00:27:ab:cd:ef brd ff:ff:ff:ff:ff:ff
 inet 10.1.2.15/24 brd 10.0.1.255 scope global enp0s3
 valid_lft forever preferred_lft forever
 inet 10.1.2.96/24 brd 10.0.1.255 scope global secondary dynamic enp0s3
 valid_lft 3224sec preferred_lft 3224sec
 inet6 fe80::a00:27ff:fe20:2c40/64 scope link 
 valid_lft forever preferred_lft forever

The address 10.1.2.96 is the secondary DHCP assigned address as indicated by the secondary dynamic keywords.

answered 39 mins ago

Lenniey

1,9452718

Unfortunately, this results in the DHCP address being the secondary address. However, it needs to be primary in order to make outgoing connections work.
â€“Â Torsten Bronger
17 mins ago

Why does it have to be primary? Are you sure you don't just need source routing? or a different gateway per IP?
â€“Â Lenniey
10 mins ago

If the DHCP-based address is primary, everything works fine. If it is secondary, outgoing connections hang. See also bugs.launchpad.net/netplan/+bug/1766656, especially comment #2.
â€“Â Torsten Bronger
5 mins ago

add a commentÂ |Â

up vote
1
down vote

Answered on Ask Ubuntu

Copy:

The solution was quite simple, just set a static IP address and enable DHCP. Basically you just have to add dhcp4: yes to your configuration.

This configuration gave me a primary static IP address and a secondary DHCP assigned IP address:

network:
 version: 2
 renderer: networkd
 ethernets:
 enp0s3:
 dhcp4: yes
 dhcp6: no
 addresses: 
 - 10.1.2.15/24
 gateway4: 10.1.2.1
 nameservers:
 search:
 - example.com
 addresses: [10.1.2.10]

The result of ip address show enp0s3 gave me:

2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
 link/ether 08:00:27:ab:cd:ef brd ff:ff:ff:ff:ff:ff
 inet 10.1.2.15/24 brd 10.0.1.255 scope global enp0s3
 valid_lft forever preferred_lft forever
 inet 10.1.2.96/24 brd 10.0.1.255 scope global secondary dynamic enp0s3
 valid_lft 3224sec preferred_lft 3224sec
 inet6 fe80::a00:27ff:fe20:2c40/64 scope link 
 valid_lft forever preferred_lft forever

The address 10.1.2.96 is the secondary DHCP assigned address as indicated by the secondary dynamic keywords.

answered 39 mins ago

Lenniey

1,9452718

Answered on Ask Ubuntu

Copy:

The solution was quite simple, just set a static IP address and enable DHCP. Basically you just have to add dhcp4: yes to your configuration.

This configuration gave me a primary static IP address and a secondary DHCP assigned IP address:

network:
 version: 2
 renderer: networkd
 ethernets:
 enp0s3:
 dhcp4: yes
 dhcp6: no
 addresses: 
 - 10.1.2.15/24
 gateway4: 10.1.2.1
 nameservers:
 search:
 - example.com
 addresses: [10.1.2.10]

The result of ip address show enp0s3 gave me:

2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
 link/ether 08:00:27:ab:cd:ef brd ff:ff:ff:ff:ff:ff
 inet 10.1.2.15/24 brd 10.0.1.255 scope global enp0s3
 valid_lft forever preferred_lft forever
 inet 10.1.2.96/24 brd 10.0.1.255 scope global secondary dynamic enp0s3
 valid_lft 3224sec preferred_lft 3224sec
 inet6 fe80::a00:27ff:fe20:2c40/64 scope link 
 valid_lft forever preferred_lft forever

The address 10.1.2.96 is the secondary DHCP assigned address as indicated by the secondary dynamic keywords.

answered 39 mins ago

Lenniey

1,9452718

answered 39 mins ago

Lenniey

1,9452718

answered 39 mins ago

Lenniey

1,9452718

answered 39 mins ago

Lenniey

1,9452718

Unfortunately, this results in the DHCP address being the secondary address. However, it needs to be primary in order to make outgoing connections work.
â€“Â Torsten Bronger
17 mins ago

Why does it have to be primary? Are you sure you don't just need source routing? or a different gateway per IP?
â€“Â Lenniey
10 mins ago

If the DHCP-based address is primary, everything works fine. If it is secondary, outgoing connections hang. See also bugs.launchpad.net/netplan/+bug/1766656, especially comment #2.
â€“Â Torsten Bronger
5 mins ago

add a commentÂ |Â

Unfortunately, this results in the DHCP address being the secondary address. However, it needs to be primary in order to make outgoing connections work.
â€“Â Torsten Bronger
17 mins ago

Why does it have to be primary? Are you sure you don't just need source routing? or a different gateway per IP?
â€“Â Lenniey
10 mins ago

If the DHCP-based address is primary, everything works fine. If it is secondary, outgoing connections hang. See also bugs.launchpad.net/netplan/+bug/1766656, especially comment #2.
â€“Â Torsten Bronger
5 mins ago

Unfortunately, this results in the DHCP address being the secondary address. However, it needs to be primary in order to make outgoing connections work.
â€“Â Torsten Bronger
17 mins ago

Why does it have to be primary? Are you sure you don't just need source routing? or a different gateway per IP?
â€“Â Lenniey
10 mins ago

If the DHCP-based address is primary, everything works fine. If it is secondary, outgoing connections hang. See also bugs.launchpad.net/netplan/+bug/1766656, especially comment #2.
â€“Â Torsten Bronger
5 mins ago

add a commentÂ |Â

up vote
1
down vote

It's actually way easier, you just add dhcp4: true to your static configuration like this (and disable v6 if you don't need it):

network:
 version: 2
 ethernets:
 ens3:
 dhcp4: yes
 dhcp6: no
 addresses:
 - 10.0.0.5/24
 - 10.0.0.250/24

answered 38 mins ago

Broco

1,235618

Here, I still have to make the dynamic 10.0.0.5 a static one.
â€“Â Torsten Bronger
16 mins ago

That's exactly what this does, you have two static addresses 10.0.0.5/24 and 10.0.0.250/24 and get an additional dynamic ip.
â€“Â Broco
13 mins ago

But 10.0.0.5 comes from the DHCP server and I donÃ¢Â€Â™t know its value a priori.
â€“Â Torsten Bronger
4 mins ago

add a commentÂ |Â

up vote
1
down vote

It's actually way easier, you just add dhcp4: true to your static configuration like this (and disable v6 if you don't need it):

network:
 version: 2
 ethernets:
 ens3:
 dhcp4: yes
 dhcp6: no
 addresses:
 - 10.0.0.5/24
 - 10.0.0.250/24

answered 38 mins ago

Broco

1,235618

Here, I still have to make the dynamic 10.0.0.5 a static one.
â€“Â Torsten Bronger
16 mins ago

That's exactly what this does, you have two static addresses 10.0.0.5/24 and 10.0.0.250/24 and get an additional dynamic ip.
â€“Â Broco
13 mins ago

But 10.0.0.5 comes from the DHCP server and I donÃ¢Â€Â™t know its value a priori.
â€“Â Torsten Bronger
4 mins ago

add a commentÂ |Â

up vote
1
down vote

It's actually way easier, you just add dhcp4: true to your static configuration like this (and disable v6 if you don't need it):

network:
 version: 2
 ethernets:
 ens3:
 dhcp4: yes
 dhcp6: no
 addresses:
 - 10.0.0.5/24
 - 10.0.0.250/24

answered 38 mins ago

Broco

1,235618

It's actually way easier, you just add dhcp4: true to your static configuration like this (and disable v6 if you don't need it):

network:
 version: 2
 ethernets:
 ens3:
 dhcp4: yes
 dhcp6: no
 addresses:
 - 10.0.0.5/24
 - 10.0.0.250/24

answered 38 mins ago

Broco

1,235618

answered 38 mins ago

Broco

1,235618

answered 38 mins ago

Broco

1,235618

answered 38 mins ago

Broco

1,235618

Here, I still have to make the dynamic 10.0.0.5 a static one.
â€“Â Torsten Bronger
16 mins ago

That's exactly what this does, you have two static addresses 10.0.0.5/24 and 10.0.0.250/24 and get an additional dynamic ip.
â€“Â Broco
13 mins ago

But 10.0.0.5 comes from the DHCP server and I donÃ¢Â€Â™t know its value a priori.
â€“Â Torsten Bronger
4 mins ago

add a commentÂ |Â

Here, I still have to make the dynamic 10.0.0.5 a static one.
â€“Â Torsten Bronger
16 mins ago

That's exactly what this does, you have two static addresses 10.0.0.5/24 and 10.0.0.250/24 and get an additional dynamic ip.
â€“Â Broco
13 mins ago

But 10.0.0.5 comes from the DHCP server and I donÃ¢Â€Â™t know its value a priori.
â€“Â Torsten Bronger
4 mins ago

Here, I still have to make the dynamic 10.0.0.5 a static one.
â€“Â Torsten Bronger
16 mins ago

That's exactly what this does, you have two static addresses 10.0.0.5/24 and 10.0.0.250/24 and get an additional dynamic ip.
â€“Â Broco
13 mins ago

But 10.0.0.5 comes from the DHCP server and I donÃ¢Â€Â™t know its value a priori.
â€“Â Torsten Bronger
4 mins ago

add a commentÂ |Â

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