howto/openvpn.md
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@@ -72,4 +72,18 @@ persist-key
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persist-tun
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ifconfig <LOCAL_GATEWAY_IP> <REMOTE_GATEWAY_IP>
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secret /etc/openvpn/<PEER_NAME>.key
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-```
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+```
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+
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+
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+# External Links
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+* multicast:
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+ * **OpenVPN**
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+ * [Optimizations for multicast over TAP w/ OpenVPN](https://community.openvpn.net/openvpn/ticket/79)
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+ * [Sending multicast over a openvpn tunnel](http://forums.openvpn.net/topic8036.html)
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+
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+ * **RFC**
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+ * [IPv6 - RFC3306](https://tools.ietf.org/html/rfc3306)
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+ * [IPv4 - multicast](https://en.wikipedia.org/wiki/Multicast_address#GLOP_addressing)
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+ * [IPv4 - GLOB calculator](http://labs.spritelink.net/glop)
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+ * [RFC3108 GLOP Addressing in 233/8](http://tools.ietf.org/html/rfc3180)
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+ * [RFC3138 Extended Assignments in 233/8](https://tools.ietf.org/html/rfc3138)
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