IPv6 deployment problems over Redback and DSL

Dan White dwhite at olp.net
Thu Jan 17 16:17:12 CET 2008

I've configured IPv6 in a similar manner using a Redback SE 400 
with a BEC Technologies modem.

I had a similar problem, with IPv6 multicast not getting passed, 
due to the modem. I could create static ND entries on both hosts 
and pass IPv6 traffic between them, but ND itself was not getting 

The "FilterIPv6Multicast 'false'" setting was not being honored. 
The most recent firmware (7402GTM_v506f1) for the modem corrected 
the problem for me.

- Dan

Jeroen Massar wrote:
> Anyone? :)
> Greets,
>  Jeroen
> -------- Original Message --------
> Date: Wed, 16 Jan 2008 23:27:37 -1000 (HST)
> From: Antonio Querubin <tony at lava.net>
> To: v6ops at ops.ietf.org
> Subject: deployment problems over Redback and DSL
> We're testing provisioning of IPv6 to broadband DSL users and have hit a
> snag.  The ILEC that provides us DSL transport does so using a supposedly
> layer-2 transparent system.  The remote DSL site that we're using for this
> test comes in on a frame-relay PVC which we bridge to a VLAN on our
> network.  The VLAN and DSL pass IPv4 traffic without any problems.  The
> VLAN passes IPv6 traffic as well.  However, IPv6 traffic seems to be
> blocked somewhere in the DSL system which consists of a Redback SMS-500,
> the ILEC's frame-relay/ATM network, the remote CO DSLAM and finally the
> remote site DSL CPE (a Westell DSL modem).  The path looks something like
> this:
> VLAN --- Redback SMS-500 --- FR/ATM cloud --- DSLAM --- DSL CPE --- switch
> Currently I suspect the IPv6 ethernet frames are being blocked somewhere
> because IPv6 ND seems to be non-functional in the above network except on
> the VLAN and switch at each end.  I've looked over the manuals for the
> Redback SMS-500 (running AOS 5.0.6) and the Westell DSL modem and neither
> mentions anything specific about filtering or blocking some types of
> ethernet frames.  That would suggest that there's something suspect with
> the ILEC's FR/ATM network or their DSLAMs.  I've asked the ILEC to start
> looking at this problem but I'm also still wary that it may still be an
> issue with the Redback or the Westell modem regardless of what their
> manuals imply.
> Has anyone run into a similar problem before, or have successfully (or
> not) bridged IPv6 over a Redback router or Westell DSL modem?
> Antonio Querubin
> whois:  AQ7-ARIN

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