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Topic # 230557 1-Mar-2018 13:44
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I got a GWN7000 on advice from someone on here. So far, awesome. Gigabit fibre, so far 100 days up time without a blip. The only thing I can't work out is the setting so I can access hit my dynamic DNS address when I'm connected to the LAN. I've got a few apps I used that don't support having 2 server IPs, it's a drag having to change the settings all the time.

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  Reply # 1966503 1-Mar-2018 13:58
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Hairpin NAT consists of a dst-nat and src-nat rule. Google.

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  Reply # 1966512 1-Mar-2018 14:10
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I've gone through that doc a couple times and really can't make much sense of it. Any plain English guidance appreciated

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  Reply # 1966514 1-Mar-2018 14:18
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As I inferred you need a dst-nat rule (the port forward from WAN to LAN server device) and a src-nat rule for the reply traffic from LAN server device to the LAN side clients (EDIT: I described it backwards).


Mikrotik example

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  Reply # 1966523 1-Mar-2018 14:31
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LAN Loopback (Hairpin NAT) as above needs a SrcNAT pointed towards your DstNAT rule.




The SrcNat needs to have the Src Group as your internal IP Pool




Basically it picks up anything internally trying to access your WAN IP and points it back towards the required DstNAT instead of dead-ending nowhere.




Sadly I've got an easy guide for this on Mikrotiks but not Grandstreams

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  Reply # 1966679 1-Mar-2018 17:38
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Your other option would be set a custom DNS entry on your router for your D-DNS domain, and have it resolve to the internal IP address of the server.

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