[AusNOG] IPv6 reverse DNS and Mail ...

[Randil Wijerathne]

It is important to disable IPv6 router advertisements in each interface.
Otherwise all workstation connected to that interface will configure EUI-64
IPv6 address. (only if complete network is NOT IPv6 compliant)

In Cisco ipv6 nd suppress-ra under interface will do.

 

Regards,

Randil

 

From: ausnog-bounces at lists.ausnog.net
[mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Scott Howard
Sent: Monday, 20 May 2013 2:07 PM
To: terry at skymesh.net.au
Cc: ausnog at lists.ausnog.net
Subject: Re: [AusNOG] IPv6 reverse DNS and Mail ...

 

How many of these are from people that are actually aware that they are
actually using IPv6 for email?

 

I've seen this countless time where people enabled IPv6 on their local
network, and their mail server automatically started attempting to use it
for delivery.  At least one major appliance vendor also has this problem -
as soon as it found an IPv6 router being advertised, it would attempt to
deliver all mail over IPv6 to any host with an AAAA address - all sourced
from it's auto-configured address with no reverse DNS...

 

 Scott

 

 

On Sun, May 19, 2013 at 8:55 PM, Terry Sweetser (SkyMesh CTO)
<terry+AusNOG at skymesh.net.au> wrote:

Hello NOGGERS,

At SkyMesh, we routinely get "submissions" from remote mail admins to stop
blocking their email.

It turns out on many occasion that the remote site has ipv6, no reverse dns,
and is connecting to our MX farm on ipv6.

So, if you're running an outbound mail server or farm of servers and start
using ipv6, do the rest of us a big favour:

Get your rev.dns set up on those servers.

-- 
http://about.me/terry.sweetser

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