Re: [PLUG] Setting up ipv6 on ubuntu 20.04

[Walt Mankowski via plug <plug@lists.phillylinux.org>]

On Tue, May 05, 2020 at 09:02:01PM -0400, Walt Mankowski via plug wrote:
> On Tue, May 05, 2020 at 08:57:22PM -0400, Soren Harward wrote:
> > On Tue, May 5, 2020 at 8:40 PM Walt Mankowski via plug <
> > plug@lists.phillylinux.org> wrote:
> > 
> > > Outgoing ipv6 seems to be working fine. However, I can only receive
> > > incoming ipv6 connections from within my LAN (basically, my
> > > laptop). DD-WRT has very few ipv6 settings so I thought it might be
> > > getting blocked by the firewall on my linux box.
> > >
> > 
> > Have you checked the ipv6 firewall settings on the router?  I know that
> > OpenWRT's default is that ipv6 behaves similarly to NAT'd IPv4: outgoing
> > connections okay, incoming connections not.
> 
> I don't see any ipv6 firewall settings on the router. In fact the
> DD-WRT online documentation [1] implies there aren't any:
> 
>   Keep in mind it can be dangerous to enable IPv6 without also having
>   a firewall on each client that handles IPv6 packets, or having
>   ip6tables on your router to filter incoming connections. ip6tables
>   is NOT included by default with DD-WRT, which means your clients
>   will be directly exposed to the Internet once you have enabled IPv6.

So it turns out this is a bit outdated. ip6tables IS included in the
latest firmware that I installed. I added some forward rules and now
it seems to be working.

Now to figure out how to make it persistent when it reboots...

Walt

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