pfsense boxes unable to reach each other over openvpn tunnel
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yeah just setup domain overrides in the unbound so they know to go ask the other unbound. And then need to make sure the acls allow the queries, etc.
You will also need to make sure you setup private domains, because since your doing a forward for that other domain if it comes back as rfc1918 it would be a rebind. And you need to make sure the unbound is setup so it can use the interface it needs do the query down the vpn connection.
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i made it work over IPsec and this guide: https://www.slideshare.net/NetgateUSA/routed-ipsec-on-pfsense-244-pfsense-hangout-june-2018
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I'm surprised you didn't use the Netgate guides. They're the only ones I really trust.
https://docs.netgate.com/pfsense/en/latest/vpn/ipsec/configuring-a-site-to-site-ipsec-vpn.html
or
https://docs.netgate.com/pfsense/en/latest/book/ipsec/site-to-site.html
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Its a hangout from netgate he was using.
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Ah I didn't see that.
I prefer the docs. The videos are nice but too much blah blah blah. I can watch an hour-long video and try to hunt down the meat by skipping around, or blast through a text guide in 10 minutes. That's not to say that I don't like or appreciate the videos. On topics that I have little knowledge in, they're extremely helpful and I watch the whole thing. But when I just need the quick & dirty particular steps, the guide is best for me.