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Cryptostorm, OpenWRT, Dynamic DNS (DDNS), OpenVPN

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Topic Author
FoodMaven
Posts: 34
Joined: Thu Jun 01, 2017 2:22 am

Cryptostorm, OpenWRT, Dynamic DNS (DDNS), OpenVPN

Postby FoodMaven » Sat Feb 17, 2018 11:06 pm

I'm so new at this, I often don't know where to begin. I have the instructions for putting OpenVPN on a router.

https://loganmarchione.com/2015/08/openwrt-with-openvpn-server-on-tp-link-archer-c7/#Setup_DDNS

In this post, the author writes about Dynamic DNS as necessary to OpenVPN. But I read some about ddns and CS an cannot tell whether this step is necessary for me. I quote it, below:

Setup DDNS
First, we’ll need to setup dynamic DNS (DDNS). We’ll be running a server out of our house, and since our ISP regularly changes our IP address, we’ll never know when the address changes. Instead, we can run a small program on OpenWrt that will reach out to a DDNS provider, tell them what our IP address currently is, and associate it to a DNS name. This way, when setting up our OpenVPN clients, we’ll use the DDNS name, not our IP.

If you don’t have one already, you’ll need a DDNS provider. I’ve been a Dyn customer since before all the drama about discontinuing their free accounts. Make sure you choose a provider that is supported by OpenWrt. Once you choose a provider, you’ll need to register a DNS name with them.

You’ll also need the following info about your account:

DDNS service name (as listed here, or in /usr/lib/ddns/services)
Host name/domain
Username
Password (some providers offer an updater key instead of exposing your password)
Interface you’ll be using to get DNS info (e.g., wan, wan6, lan, etc…)


What I've read at the Forum does not inform me of what I need to do here. :x Currently there are approximately 33,337 providers of the DDNS service.

https://gist.githubusercontent.com/neu5ron/8dd695d4cb26b6dcd997/raw/d838cc55e9de34b283cd9b1f3822b53a2d8c5c0a/dynamic-dns.txt

I am running all Internet traffic through this router (and it's wifi) into a modem supplied from the ISP.

How can I tell if my ISP regularly changes my IP address? (Looking up the following keywords brings useless results: AT&T change IP address)

Does CS require DDNS if the router is the only way to access the Internet?

If "Yes" does CS sell, recommend or can you refer me to a service the CS developers know and prefer, or at least approve?

Know that I'm not a networking sophisticate, as nearly everyone else is at this Forum. I can cut & paste but that's about it. I don't want to waste your time in replying to this post of mine. Excellent technical explanations may help others, they are likely to further confuse me.

THANK YOU.

User avatar

parityboy
Site Admin
Posts: 1220
Joined: Wed Feb 05, 2014 3:47 am

Re: Cryptostorm, OpenWRT, Dynamic DNS (DDNS), OpenVPN

Postby parityboy » Sun Feb 18, 2018 10:59 pm

@OP

The entire point of DNS is to provide a consistent point of contact for a network service - e.g "www.google.com" - regardless of its IP address. Dynamic DNS is exactly that - it dynamically updates the IP address of a given DNS entry when that IP address changes, common with residential ISPs.

Does this apply to a router connected to a Cryptostorm exit node? If you want to contact your home IP address directly (perhaps to access services running on your home network when you're out on the road, like Plex for example) then yes (and the connection to Cryptostorm becomes irrelevant). If not, then no.

On a related note, accessing services running on your LAN via the IP address of a Cryptostorm exit node isn't going to work; Cryptostorm's network does not support the supply of a stable port number on their exit nodes, and most of the time it isn't needed anyway.


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