Hi Terry,

I find this difficult to understand - these systems should operate independently IIRC, especially seeing as they both have their own independent physical cables to both sides of the network.

I think it might be useful if you post the rules. There are some tweaks I'm meant to make to the firewall configuration at some point anyway, so I might as well familiarise myself with them.

NB: "sudo ufw status numbered" may also be useful if UFW was used to configure the firewall.


On 27/03/2022 10:48, Terry Coles wrote:

Some of you may remember my earlier queries about setting up a Webserver and
more latterly a VPN Server for the Wimborne Model Town.  All this has worked
fine through last Summer.

Over the Winter Maintenance Period, I upgraded the VPN Server to the latest
Version of RPi OS and pistrong (swanStrong) and after a few issues was able to
redeploy the server in January this year.  We didn't notice any other issues
until recently, mainly because the whole network had been rendered
dysfunctional while the main Network Switch was removed for refurbishment of
the area around it's location.

Recently, we discovered a problem with the Webserver; it no longer served up
Webpages!  I brought the Webserver hardware home and connected it to a
reference model of the VPN Server and a representative site WiFi Antenna with
a couple of switches.  I've posted a diagram at:


What I have discovered is that the system works if I disconnect the VPN Server
from the 5-port switch at the server, but not if I disconnect the Webserver
from the 5-port Switch.  I think that is because when the user uses his device
to connect to the WiFi Antenna, nodogsplash detects this and that obviously
needs a connection to the Antenna.

I'm assuming that I should be able to fix this by dropping the connections at
the VPN Server to the Webserver or vice versa.  However, both devices have
extensive iptables rules set up which I really don't understand, so before I
write off to the authors of nodogsplash and / or pistrong can anyone shed any
light on what is happening and how to fix it?

I can post the rules from the two devices if it helps.

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