Hi Terry,

> > customer-mobile (another Pi?) manual too.
>
> I'm fresh out of Pis but I may be able to cobble together something
> using a mobile phone or laptop connected by Ethernet

A laptop running Linux would do as well.

> I was also thinking of starting again from scratch with a clean
> installation of Raspbian and building the RPi Router from there,
> before ever attempting something like NoDogSplash.  At least then I
> would know that I haven't introduced some incompatibility along the
> way.

Sounds like a good idea.

> > >     address 192.168.0.9
> >
> > Given `address', ...
>
> I'm sorry, I don't understand that comment.

It's just an intro to the next bit...

> > >     netmask 255.255.255.0
> > >     network 192.168.0.0
> > >     broadcast 192.168.0.255
> >
> > `netmask', `network' and `broadcast' are redundant here as they're
> > corresponding values that can be simply computed.
>
> OK.  I was simply following the tutorial that I had found.

...that you understood.  :-)

> One final question.  If I open a default copy of
> /etc/network/interface, it says that the file is intended to be used
> with dhcpcd.conf.  Do I still need to define the static IP address of
> eth0 in both places or just here?

Well, in your new `start from scratch' there won't be a DHCP server to
read dhcpcd.conf.  :-)  You should be telling the server to just listen
on eth0 rather than its default of all interfaces that are up and can
broadcast.  I don't see any reason why it would need to be told eth0's
static address is 192.168.0.9 as it won't be handling a DHCPDISCOVER
request for that interface as it's statically defined in
/etc/network/interfaces.

Cheers, Ralph.

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