[nznog] Web Servers: Dual-homing or DNAT/Port Forwarding?

Geraint Jones geraint at koding.com
Tue Dec 10 22:30:14 UTC 2013


On 11/12/13 10:13 am, "Alex White-Robinson" <alexwr at gmail.com> wrote:


>Wotcha,
>
>>Number 1 gets you thinking along the IPv6 route (no pun, and imho :) )
>>since you have to treat each boxes as if it was public.
>
>I see this kind of statement surprisingly often. Having a public address
>doesn't make a device public.

Yes it does, it makes end to end connectivity work again. NAT broke that
(and its one of the best things about v6). People have been relying on the
fact that you need rules to get through a NAT to reach a box - thereby
having NAT work as an inbound firewall. NAT != Security.

But yes having a public address means your box is public, you have to do
something to STOP traffic getting to it. With NAT you have to do something
to ENABLE traffic to get to it.

>I don't really see a drive to have devices exposed to the internet without
>a stateful device in front of them in IPv6 world. People shouldn't allow
>unsolicited connections to hit your internal workstation on any address
>scheme.
>
>Cheers,
>Alex.
>
>
>Date: Tue, 10 Dec 2013 05:56:41 +1300
>From: Pieter De Wit <pieter at insync.za.net>
>To: nznog at list.waikato.ac.nz
>Subject: Re: [nznog] Web Servers: Dual-homing or DNAT/Port Forwarding?
>Message-ID: <52A5F649.7070904 at insync.za.net>
>Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"
>
>Hi,
>
>I normally use a combination of "1" and "2". I prefer 1 for weird and
>"not nat friendly" protocols, like SIP or some other application. The
>general rule of thumb is to use number 2 in other cases. In both setups,
>remember to deploy local firewalls as well. This will help for the case
>when a box on the subnet is hacked.
>
>My other twist is to deploy "1" without the private NIC, along with
>local firewalls (and as you said, dedicated FW).
>
>Number 1 gets you thinking along the IPv6 route (no pun, and imho :) )
>since you have to treat each boxes as if it was public.
>
>Cheers,
>
>Pieter





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