Support for RFC6598

Server Version#: 1.14.1.5488
Player Version#: 3.81.1

If you use RFC6598 address space in the “LAN Networks” or “Networks without auth” Plex throws error messages saying “Illegal whitelist covers multiple WAN IPs”.

That space is not supposed to be used at your home.

Use an RFC1918 space.

Understand the CNAT use cases but when everyone abuses RFC1918… you have 6598 and ipv6.

If I may augment Nokdim’s reply,

The dev’s chose to implement RFC1918 space for home LAN.
They are also implementing full IPv6 support which will remove the problem completely.
It is possible to define multiple RFC1918 LAN specifications in subnets to allow without auth.
There is such a thing as “Too much of a good thing” in home (domestic) LAN networking.

RFC6598 IP address is typically assigned to the WAN interface of your CPE (edge device). Did your ISP provide you with a subnet block from the RFC6598 space?

No. Primarily used for P2P and in a few places the 2nd use case of the RFC.

Amended that since RFC1918 is what appears to be the only subnets allowed, adjusting the doc string on the input should probably also explicitly call out RFC1918. And for bonus points there should be a visual warning for invalid inputs rather than accepting anything and spitting errors in the logs.

LAN Networks
Comma separated list of IP addresses or IP/netmask entries for networks that will be considered to be on the local network when enforcing bandwidth restrictions. If set, all other IP addresses will be considered to be on the external network and and will be subject to external network bandwidth restrictions. If left blank, only the server’s subnet is considered to be on the local network.

List of IP addresses and networks that are allowed without auth
Comma separated list of IP addresses or IP/netmask entries for networks that are allowed to access Plex Media Server without logging in. When the server is signed out and this value is set, only localhost and addresses on this list will be allowed.

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