multiple prefixes

Brian E Carpenter brian.e.carpenter at
Wed Feb 13 09:09:17 CET 2013

On 12/02/2013 14:08, Seth Mos wrote:
> On 12-2-2013 14:38, Brian E Carpenter wrote:
>> On 12/02/2013 12:46, Seth Mos wrote:
>>> On 12-2-2013 13:18, Tore Anderson wrote:
>>>> * Doug Barton
>>>>> NPTv6 for free,
>>>> Free, really?
>>>> Which vendor gives away free NPTv6 translators?
>>> Since you likely need(want?) a firewall when implementing NPtv6 you can
>>> probably just turn it on your platform.
>>> In the Open Source firewall pfSense version 2.1 it comes standard with
>>> the other IPv6 support. 
>> Which ALGs are included?
> None.
> Was that a requirement of sorts? For a lot of client or server initiated
> traffic, it works very similar to what we are used to.

Yes, but surely enterprises will expect (I hate to write this) feature-equivalence
with NAPT44? Doesn't that mean you need a minimum set of ALGs?

> With a few of the drawbacks ofcourse. I am not saying that SIP will just
> work.

I'm sure it won't, although for a protocol designed long after NAT became
prevalent, SIP is remarkably resistant to reality, so my sympathy is


> The recommended strategy in this case is picking 1 GUA prefix as the
> "master" prefix, and setup the other one with NPtv6. This to reduce the
> impact of translation. For outbound load balancing of port 80 traffic it
> just happens to work.
> Use policy based routing for the rest, the same issues with regards to
> outbound SMTP filtering and DNS per ISP are still just as valid.
> Regards,
> Seth

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