VPN help with ipv6

[Puck6T9]

I have look for days, but can't find a post that is the same as my problem. So I'm going to ask for help. This may sound dumb, but I'm at a loss on it.

I have a VPN server up & running. Using the ipv4 address i can connect just fine to it. But if i try using my ipv6 address it just times out when outside the network. Inside the network it connects. I know what my WAN ipv6 is & what my ipv6 block assigned to me by my isp is. But neather address will connect remotely. What is the ipv6 address i use? What am I missing that is preventing the connection?

On a sperate question, i have a 4g hotspot. According to the provider the ipv4 is private, but it supports ipv6 & they clam the ipv6 is public. I can belive it becouse when the xbox is connected to it & using ipv6 it shows a open NAT & no firewalls. Now my Asus rt3200 can use this hotspot as a usb modem. But i have to run the ipv6 on the Asus in passthrough mode. Is there a way to run a VPN, or any remote network access, by using the ipv6 on the hotspot. The hotspot has a setting to allow incoming ipv6 connections.

Thanks for any help any one can provide. Im normally good with networking, but I'm at a loss on my ipv6 issues .

 

[Puck6T9]

So i guess no one can help me.

I've been looking, but i still can't find what i need. It's like the firewall is blocking the incoming connection to the VPN when using a ipv6 address. I've tried adjustments to the ipv6 firewall & even turning it completely off. Still no response.

 

[Erik Edwards]

I have run into the IPv6 firewall problem. The logic in the enable/disable seems to be 1/2 backwards. This causes the required rules to be skipped. ssh into the box and "ip6tables -S " and "ip6tables -S -t mangle" to see what the current set of rules are. I also had an issue with the VPN, RT-N66U <-> RT-N66U (running same version of s/w) where OpenVPN was being called with the WAN IPv6 interface address on the client machine. One would think this is the correct procedure, but NO. My client ISP provides IPv6-PD over PPPoE but give the ppp interface (wan) a private IPv6 address. The OpenVPN server was receiving the connection initiation request, but couldn't reply to the private IPv6 address.

 

[Puck6T9]

Sorry it took so long to respond, never got the notification of a reply.

Yes, turns out the firewall was doing the blocking. Seems the ipv6 firewall settings page is useless. I did ssh into my router & running a command to open all ports on ipv6 allowed the connection, but made different issues.

The phone connected still could not see internal network addresses, & kept disconnecting & reconnecting.

I also need to find out how to do this on a router using a usb hotspot as its WAN connection, when ipv6 only works right in passthrough mode. Also need adjust the code to open only the port i need, only for the usb WAN, & set it to run at boot.

ip6tables -I INPUT -i ppp0 -p tcp --dport XXXX -j ACCEPT

That redone to use WAN on usb, then put into a script & on the jffs, while getting a ipv6 to the router in passthrough mode.