RE: Greenfield ISP (In January)

[Nicholas Warren <nwarren () barryelectric com>]

Does anyone beside Cisco do MAP? Brocade, Juniper, Huawei?

Thank you,
- Nich Warren


-----Original Message-----
From: Tore Anderson [mailto:tore () fud no]
Sent: Friday, June 12, 2015 12:15 AM
To: Baldur Norddahl
Cc: Nicholas Warren; nanog () nanog org
Subject: Re: Greenfield 464XLAT (In January)

* Baldur Norddahl <baldur.norddahl () gmail com>

> The high tech solution is stuff like MAP where you move the cost out 
> to the CPE. But then you need to control the CPE - if you have that 
> then great. You would still want to sell a non-NAT (and MAP is NAT) to 
> users that require a public IPv4 address, so you still need to go dual 
> stack or use some tunnelling for that.

Hi Baldur,

MAP is *not* NAT; that's what's so neat about it. The users do get a public IPv4 address (or prefix!) routed to their 
CPE's WAN interface, towards which they can accept inbound unsolicited connections.

The public IPv4 address could be port-restricted if the operator wants address sharing, but it does not have to be. You 
could do both at the same time, e.g., giving your "premium" users a /32 or /28, while the standard subscription 
includes a /32 with 4k ports.

I will grant you that MAP-T performs NAT (i.e., protocol translation) internally, but the translations that happens 
when a packet enters the MAP domain are reversed when it exits. So the IPv4 addresses are transparent end-to-end.

MAP-E (and lw4o6 for that matter), on the other hand, has no form of NAT anywhere. (Unless you count the NAPT44 that 
sits between the subscriber's RFC1918 LAN segment and the CPE's WAN interface, but that's not exactly something that's 
unique to MAP.)

Nicholas: If I were you, before going down the 464XLAT route, I'd first look closely at these technologies, in the 
order given:

1) MAP (because it is fully stateless)
2) lw4o6 (because it is mostly stateless, i.e., no session tracking)
3) DS-Lite (which, like 464XLAT, is stateful, but you'll have way more
   CPEs to choose from than with 464XLAT, which is mostly for mobile)

Tore