David,

With DHCPv6 and "Prefix Delegation" you leave the "IPv6/nn:" filed blank 
(actually, it will be ignored).  "IPv6/nn:" is only used for static addressing.

There is a lot to learn about IPv6, not rocket science, but a lot of details 
that any self-respecting geek should know. :-)

Lonnie


On Feb 5, 2016, at 8:10 AM, David Kerr <da...@kerr.net> wrote:

> Okay, cool.  Something to play with over the weekend.  For IP Autoconfig on 
> the internal LANs.... do I leave the field after it blank, or do I have to 
> enter something akin to IPv4's 192.168.x.y ?  Forgive me is that is a dumb 
> question, but I am not at all familiar with IPv6 yet.
> 
> Thanks
> David
> 
> On Fri, Feb 5, 2016 at 9:00 AM, Lonnie Abelbeck <li...@lonnie.abelbeck.com> 
> wrote:
> Hi David,
> 
> We recently added DHCPv6 client support (which Comcast requires), so if you 
> built an image recently you should have it:
> 
> *If* you wanted to enable IPv6:
> --
> Network tab -> IP Version: [ IPv4 & IPv6 ]
> 
> Network tab -> Connection Type: [ DHCP/DHCPv6 ]
> 
> Network tab -> Internal Interfaces: -> IPv6 Autoconfig: [ enabled ]  for any 
> internal LAN that you want IPv6 Enabled using "Prefix Delegation"
> 
> Network tab -> External DHCPv6 Client Settings: (the defaults should be fine)
> --
> 
> > Which now begs the question whether I should enable it on my AstLinux box 
> > which is what is ordinarily connected to the cable modem.  If I do enable 
> > it, what affect does it have.... will systems on my local LAN be issued 
> > IPv6 addresses as well as IPv4?  Are there any security or firewall 
> > implications?  Is there any benefit?
> 
> 
> Do you need IPv6 enabled now ?  most likely no.
> 
> Will enabling IPv6 have any security or firewall implications ?  most likely 
> no, a lot of effort has been made to make dual-stack IPv4/IPv6 seamless.  But 
> never say never.
> 
> Should you enable it ?  your call, but I would think you do, if not only to 
> learn about IPv6.  Worst case the "Network tab -> IP Version:" master switch 
> can disable IPv6 if needed.
> 
> Personally, I have had IPv6 enabled for well over 5 years using Hurricane 
> Electric's https://www.tunnelbroker.net . Looking forward to getting "native" 
> IPv6 support from my ISP some day.
> 
> One thing to remember is IPv6 is 'routed' so you are protected by iptables's 
> stateful inspection and not by NAT.  You don't port-forward to internal 
> devices, but rather you selectively route IPv6 to internal devices.
> 
> If you currently have firewall rules limiting kids "screen time" make sure 
> they are not IPv4-only rules.  The time-schedule-host-block plugin should 
> also work with IPv6.  Most all modern devices today will try to support IPv6 
> if available.
> 
> Lonnie
> 
> 
> On Feb 4, 2016, at 9:13 PM, David Kerr <da...@kerr.net> wrote:
> 
> > Yesterday I connected my MacBook directly to my cable modem as I was 
> > testing whether AstLinux impacted speedtest results having just been 
> > upgraded to Comcast higher speed service -- answer no, or if it does it is 
> > negligible.
> >
> > However I happened to notice in Network Settings that in addition to the 
> > regular IPv4 address, DHCP had also returned a IPv6 address.  This is the 
> > first time I have noticed this and I suppose it means that Comcast now 
> > supports IPv6
> >
> > Which now begs the question whether I should enable it on my AstLinux box 
> > which is what is ordinarily connected to the cable modem.  If I do enable 
> > it, what affect does it have.... will systems on my local LAN be issued 
> > IPv6 addresses as well as IPv4?  Are there any security or firewall 
> > implications?  Is there any benefit?
> >
> > Anyone done this and/or have advice?
> >
> > Thanks
> > David
> 
> 
> 
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