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Amazon EC2 ubuntu instance ifconfig does not show interfaces attached by attach_network_interface

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0

0

I have launched a c3.xlarge ubuntu instance in a VPC. This instance supports 4 interfaces. I use ec2 python APIs to create_network_interface and attach_network_interface to add eth1, eth2, and eth3. On the AWS console, the instance is up and running. All 4 network interfaces are shown in the AWS console with the correct subnet ID.

When I ssh into the instance, and use "ifconfig" to show the interfaces, only eth0 is shown. If I use "ifconfig -a", I can see eth0-3, but only eth0 has an IP address assign to it.

Am I missing anything?
Thanks in advance....

---

Edit:
From the AWS console EC2 dashboard, I clicked on the instance->Description, scroll down to see the "Network interfaces" portion, it shows all eth0, eth1, eth2, and eth3. If I click on eth1 - eth3, they all show the IP address and status like this:
Network Interface eth1
Interface ID
eni-119f304f
VPC ID
vpc-873db7e2
Attachment Owner
17xxxxxxxx79
Attachment Status
attached
Attachment Time
Fri Sep 09 10:58:58 GMT-700 2016
Delete on Terminate
false
Private IP Address
10.31.2.12
Private DNS Name
ip-10-31-2-12.us-west-2.compute.internal

Elastic IP Address

Source/Dest. Check
true
Description
cluster001-demux-peer1
Security Groups
cluster001-demux

The private IP addresses are created and assigned to those network interfaces from AWS's point of view.

The /etc/network/interfaces shows the normal things:
auto lo
iface lo inet loopback

# Source interfaces

# Please check /etc/network/interfaces.d before changing this file

# as interfaces may have been defined in /etc/network/interfaces.d

# NOTE: the primary ethernet device is defined in

# /etc/network/interfaces.d/eth0

# See LP: #1262951

source /etc/network/interfaces.d/*.cfg

amazon-ec2 linux-networking

share|improve this question

edited May 19 '17 at 17:22

Duncan X Simpson

255319

asked Sep 9 '16 at 17:50

Cheng HsiangCheng Hsiang

11

bumped to the homepage by Community♦ 2 mins ago

This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.

add a comment | 

0

0

I have launched a c3.xlarge ubuntu instance in a VPC. This instance supports 4 interfaces. I use ec2 python APIs to create_network_interface and attach_network_interface to add eth1, eth2, and eth3. On the AWS console, the instance is up and running. All 4 network interfaces are shown in the AWS console with the correct subnet ID.

When I ssh into the instance, and use "ifconfig" to show the interfaces, only eth0 is shown. If I use "ifconfig -a", I can see eth0-3, but only eth0 has an IP address assign to it.

Am I missing anything?
Thanks in advance....

---

Edit:
From the AWS console EC2 dashboard, I clicked on the instance->Description, scroll down to see the "Network interfaces" portion, it shows all eth0, eth1, eth2, and eth3. If I click on eth1 - eth3, they all show the IP address and status like this:
Network Interface eth1
Interface ID
eni-119f304f
VPC ID
vpc-873db7e2
Attachment Owner
17xxxxxxxx79
Attachment Status
attached
Attachment Time
Fri Sep 09 10:58:58 GMT-700 2016
Delete on Terminate
false
Private IP Address
10.31.2.12
Private DNS Name
ip-10-31-2-12.us-west-2.compute.internal

Elastic IP Address

Source/Dest. Check
true
Description
cluster001-demux-peer1
Security Groups
cluster001-demux

The private IP addresses are created and assigned to those network interfaces from AWS's point of view.

The /etc/network/interfaces shows the normal things:
auto lo
iface lo inet loopback

# Source interfaces

# Please check /etc/network/interfaces.d before changing this file

# as interfaces may have been defined in /etc/network/interfaces.d

# NOTE: the primary ethernet device is defined in

# /etc/network/interfaces.d/eth0

# See LP: #1262951

source /etc/network/interfaces.d/*.cfg

amazon-ec2 linux-networking

share|improve this question

edited May 19 '17 at 17:22

Duncan X Simpson

255319

asked Sep 9 '16 at 17:50

Cheng HsiangCheng Hsiang

11

bumped to the homepage by Community♦ 2 mins ago

This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.

add a comment | 

I have launched a c3.xlarge ubuntu instance in a VPC. This instance supports 4 interfaces. I use ec2 python APIs to create_network_interface and attach_network_interface to add eth1, eth2, and eth3. On the AWS console, the instance is up and running. All 4 network interfaces are shown in the AWS console with the correct subnet ID.

When I ssh into the instance, and use "ifconfig" to show the interfaces, only eth0 is shown. If I use "ifconfig -a", I can see eth0-3, but only eth0 has an IP address assign to it.

Am I missing anything?
Thanks in advance....

---

Edit:
From the AWS console EC2 dashboard, I clicked on the instance->Description, scroll down to see the "Network interfaces" portion, it shows all eth0, eth1, eth2, and eth3. If I click on eth1 - eth3, they all show the IP address and status like this:
Network Interface eth1
Interface ID
eni-119f304f
VPC ID
vpc-873db7e2
Attachment Owner
17xxxxxxxx79
Attachment Status
attached
Attachment Time
Fri Sep 09 10:58:58 GMT-700 2016
Delete on Terminate
false
Private IP Address
10.31.2.12
Private DNS Name
ip-10-31-2-12.us-west-2.compute.internal

Elastic IP Address

Source/Dest. Check
true
Description
cluster001-demux-peer1
Security Groups
cluster001-demux

The private IP addresses are created and assigned to those network interfaces from AWS's point of view.

The /etc/network/interfaces shows the normal things:
auto lo
iface lo inet loopback

# Source interfaces

# Please check /etc/network/interfaces.d before changing this file

# as interfaces may have been defined in /etc/network/interfaces.d

# NOTE: the primary ethernet device is defined in

# /etc/network/interfaces.d/eth0

# See LP: #1262951

source /etc/network/interfaces.d/*.cfg

amazon-ec2 linux-networking

share|improve this question

edited May 19 '17 at 17:22

Duncan X Simpson

255319

asked Sep 9 '16 at 17:50

Cheng HsiangCheng Hsiang

11

# Source interfaces

# Please check /etc/network/interfaces.d before changing this file

# as interfaces may have been defined in /etc/network/interfaces.d

# NOTE: the primary ethernet device is defined in

# /etc/network/interfaces.d/eth0

# See LP: #1262951

source /etc/network/interfaces.d/*.cfg

share|improve this question

edited May 19 '17 at 17:22

Duncan X Simpson

255319

asked Sep 9 '16 at 17:50

Cheng HsiangCheng Hsiang

11

share|improve this question

edited May 19 '17 at 17:22

Duncan X Simpson

255319

asked Sep 9 '16 at 17:50

Cheng HsiangCheng Hsiang

11

edited May 19 '17 at 17:22

Duncan X Simpson

255319

edited May 19 '17 at 17:22

Duncan X Simpson

255319

asked Sep 9 '16 at 17:50

Cheng HsiangCheng Hsiang

11

asked Sep 9 '16 at 17:50

Cheng HsiangCheng Hsiang

11

2 Answers
2

active

oldest

votes

0

You're not missing too much. Only eth0 has an IP, so by default ifconfig will show only that one. The other interfaces either need IPs, don't have a configuration in your interfaces file(s), or don't have dhcp services on their layer two broadcast domains.

How about providing the contents of /etc/networks/interfaces so we can see what's supposed to be what? That is, if you don't just see the problem immediately.

share|improve this answer

answered Sep 9 '16 at 17:57

SpoolerSpooler

6,1941228

add a comment | 

0

I figured it out. I need to add a delay, e.g. time.sleep(1), between python API create_network_interface and attach_network_interface. This was not necessary, but now it seems like AWS infrastructure has changed, I do need to add this delay.
It is now working...

share|improve this answer

answered Sep 9 '16 at 21:57

user5655748user5655748

1

add a comment | 

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0

You're not missing too much. Only eth0 has an IP, so by default ifconfig will show only that one. The other interfaces either need IPs, don't have a configuration in your interfaces file(s), or don't have dhcp services on their layer two broadcast domains.

How about providing the contents of /etc/networks/interfaces so we can see what's supposed to be what? That is, if you don't just see the problem immediately.

share|improve this answer

answered Sep 9 '16 at 17:57

SpoolerSpooler

6,1941228

add a comment | 

0

You're not missing too much. Only eth0 has an IP, so by default ifconfig will show only that one. The other interfaces either need IPs, don't have a configuration in your interfaces file(s), or don't have dhcp services on their layer two broadcast domains.

How about providing the contents of /etc/networks/interfaces so we can see what's supposed to be what? That is, if you don't just see the problem immediately.

share|improve this answer

answered Sep 9 '16 at 17:57

SpoolerSpooler

6,1941228

add a comment | 

You're not missing too much. Only eth0 has an IP, so by default ifconfig will show only that one. The other interfaces either need IPs, don't have a configuration in your interfaces file(s), or don't have dhcp services on their layer two broadcast domains.

How about providing the contents of /etc/networks/interfaces so we can see what's supposed to be what? That is, if you don't just see the problem immediately.

share|improve this answer

answered Sep 9 '16 at 17:57

SpoolerSpooler

6,1941228

share|improve this answer

answered Sep 9 '16 at 17:57

SpoolerSpooler

6,1941228

answered Sep 9 '16 at 17:57

SpoolerSpooler

6,1941228

answered Sep 9 '16 at 17:57

SpoolerSpooler

6,1941228

0

I figured it out. I need to add a delay, e.g. time.sleep(1), between python API create_network_interface and attach_network_interface. This was not necessary, but now it seems like AWS infrastructure has changed, I do need to add this delay.
It is now working...

share|improve this answer

answered Sep 9 '16 at 21:57

user5655748user5655748

1

add a comment | 

0

I figured it out. I need to add a delay, e.g. time.sleep(1), between python API create_network_interface and attach_network_interface. This was not necessary, but now it seems like AWS infrastructure has changed, I do need to add this delay.
It is now working...

share|improve this answer

answered Sep 9 '16 at 21:57

user5655748user5655748

1

add a comment | 

I figured it out. I need to add a delay, e.g. time.sleep(1), between python API create_network_interface and attach_network_interface. This was not necessary, but now it seems like AWS infrastructure has changed, I do need to add this delay.
It is now working...

share|improve this answer

answered Sep 9 '16 at 21:57

user5655748user5655748

1

share|improve this answer

answered Sep 9 '16 at 21:57

user5655748user5655748

1

answered Sep 9 '16 at 21:57

user5655748user5655748

1

answered Sep 9 '16 at 21:57

user5655748user5655748

1