[PLUG] New Comcast wireless modem WORKING with old Buffalo wirelessrouter

[Walt Mankowski <waltman@pobox.com>]

On Mon, Dec 18, 2017 at 03:04:19PM -0500, Walt Mankowski wrote:
> On Mon, Dec 18, 2017 at 07:58:54PM +0000, Rich Mingin (PLUG) wrote:
> > This is why people avoid double nat. Your internal router is not aware of
> > the other router, so it's not handling these requests for the external
> > address correctly. This will not work.
> 
> That's what I was thinking too, and so I now have the desktop plugged
> directly into to the modem. I updated my forward rules and
> disconnected everything from the dd-wrt router.
> 
> Unfortunately I'm still haven't the same problem. I can ssh externally
> using the external address, and I can ssh internally using the 10.*
> address. But I can't connect internally using the outside address.

Update -- I finally got it working!  For future reference, here's how
I ended up doing it:

1. Set the modem to bridge mode
2. Plugged ethernet cable from modem to my old dd-wrt router
3. Connected my laptop to dd-wrt via wifi to monitor it
4. DD-WRT was showing an IP address of 0.0.0.0
5. Rebooted both the modem and dd-wrt several times until dd-wrt
   showed a proper IP
6. Plugged in an ethernet cable from my Ubuntu box to dd-wrt
7. Ran "sudo systemctl restart networking.service" on Ubuntu
8. Updated my DNS entries and waited for them to propagate.

Rebooting the modem was one thing I hadn't tried yesterday, so that
seems like it may have been important. The DNS issues I was having
(which turn out to be due to "NAT loopback") are all working as they
were with my old modem.

Thanks to Jonathan Simpson for suggesting rebooting, and for everyone
else who offered suggestions both here, on the IRC channel, and at
West last night!

Walt

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