VPN and DMZ

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crewze
DD-WRT Novice


Joined: 22 Jun 2019
Posts: 1

PostPosted: Sat Jun 22, 2019 15:02    Post subject: VPN and DMZ Reply with quote
I have a DD-WRT attached to an ISP cable router. I have a server connected to the DD-WRT router that I would like to access from the internet. I have a DMZ set up on both routers and I am able to access the server fine un til I activate the VPN. AT that point the VPN stops woking and the access to the server no longer works. See attached diagram for network config.

I am not sure this is suppose to work. Maybe e someone could tell me if it should work and if not suggest a way to get access to the server with the VPN running.


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VPN Network Diagram.pdf
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egc
DD-WRT Guru


Joined: 18 Mar 2014
Posts: 6173
Location: Netherlands

PostPosted: Sat Jun 22, 2019 15:58    Post subject: Reply with quote
It is not entirely clear yet to me.

You show us two routers, is the top one the ISP router?
It seems so as it has the Public IP address

But the server seems connected to this router and that is not the DDWRT router?

The bottom one seems connected to its WAN port so you are double NATting?
Is this the DDWRT router with an OVPN client to ExpressVPN?

In general when you have an OVPN client running on your router and you want to reach something on or behind that router then you have to use Policy based Routing.

If you don not use Policy Based Routing your default gateway is your VPN conncetion and your firewal will not allow incoming connections on your WAN which are going out via your VPN.

When using Policy based routing the default is restored to your WAN.

_________________
Routers:Netgear R7800, R6400v1, R6400v2, Linksys EA8500, EA6900 (XvortexCFE), E2000 (converted WRT320N), WRT54GS v1.
OpenVPN Policy Based Routing guide: https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=321686
Install guide R6400v2:http://forum.dd-wrt.com/phpBB2/viewtopic.php?t=316399
OpenVPN Server Setup:https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=318795
Install guide R7800: https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=320614
Wireguard Server setup guide:https://forum.dd-wrt.com/phpBB2/viewtopic.php?p=1183135
Wireguard Client setup guide:https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=324624
Wireguard Advanced setup guide:https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=324787
Forum Guide Lines (important read):https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=324087
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