Fwd: Bug#745587: base: Cloud AWS EC2 Image will not reply to packets received on additional network interface (ENI)
I just received the following bug report on cloud-init.
Does somebody have experience with secondarly elastic network interfaces ?
By the way, I have not yet uploaded cloud-init 7.5, since I still have problems
with the regression tests failign in a minimal environment. Suggestions are
Have a nice day,
-- Charles Plessy, Tsurumi, Kanagawa, Japan.
----- Forwarded message from Holger Levsen <email@example.com> -----
Date: Wed, 23 Apr 2014 09:06:15 +0200
From: Holger Levsen <firstname.lastname@example.org>
Subject: Re: Bug#745587: base: Cloud AWS EC2 Image will not reply to packets received on additional network interface (ENI)
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reassign 745587 cloud-init
# is that the correct packages for reporting bugs in AWS EC2 debian images?
On Mittwoch, 23. April 2014, Jeff Stiles wrote:
> Package: base
> Severity: important
> Dear Maintainer,
> I recently ran into an issue with the AWS EC2 debian image found in the AWS
> Marketplace (ami-1ebcd32e). When attaching a secondary Elastic Network
> Interface to the the instance during instance configuration and giving it
> an IP address, there is strange network behaviour. First, the second
> network interface is not configured authomatically and you must manually
> add eth1 to /etc/network/interfaces.
> Upon restarting networking, the interface does acquire its IP address via
> DHCP from EC2. When sending traffic from eth1, you receive responses.
> However, when you initate traffic from another system in the same subnet
> as eth1, eth1 will not reply to the traffic (ICMP, SSH, etc).
> The strangest part is that if you watch ifconfig for eth1, you will see the
> Rx incrementing from the traffic being sent to it, but with no
> corresponding Tx traffic. I can confirm that it is not a security group
> issue as both network interfaces are in the same security group and
> I tried the newest Debian AMI and it has the same issue. The Ubuntu release
> in the AWS Marketplace also has the same issue. When spinning up an Amazon
> Linux AMI, there is no issue. The secondary interface is configured on
> first boot and there is not issue with traffic being handled properly by
> Here is a related bug for Ubuntu, but it does not address the issue of
> additional iterfaces not properly handling traffic:
> -- System Information:
> Debian Release: 7.4
> APT prefers stable-updates
> APT policy: (500, 'stable-updates'), (500, 'stable')
> Architecture: amd64 (x86_64)
> Kernel: Linux 3.2.0-4-amd64 (SMP w/1 CPU core)
> Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
> Shell: /bin/sh linked to /bin/dash
----- End forwarded message -----
Debian Med packaging team,
Tsurumi, Kanagawa, Japan