# allowedNetworks: hardcoded IPv4 format, even with IPv6 enabled **URL:** \ **Category:** Plex Media Server\ **Tags:** server-synology, networking\ **Created:** [June 4, 2021, 4:53pm UTC](https://forums.plex.tv/t/allowednetworks-hardcoded-ipv4-format-even-with-ipv6-enabled/720498 "2021-06-04T16:53:01Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![bloerwald](https://avatars.discourse-cdn.com/v4/letter/b/ba9def/32.png) [@bloerwald](https://forums.plex.tv/u/bloerwald)\ **Post date:** [June 4, 2021, 4:53pm UTC](https://forums.plex.tv/t/allowednetworks-hardcoded-ipv4-format-even-with-ipv6-enabled/720498/1 "2021-06-04T16:53:01Z")
Server Version#: 1.23.2.4600 Player Version#: — irrelevant — In parsing of `allowedNetworks` preference, a `inet_pton (AF_INET6)` case is missing: > ```auto > Request: [192.168.178.34:56086 (Allowed Network (Subnet))] PUT /:/prefs?allowedNetworks=fe80%2F8 (13 live) GZIP Signed-in Token (…@googlemail.com) > Error parsing allowedNetworks 'fe808': Invalid argument > > ``` Other calls to `inet_pton` check with AF\_INET6 first, then fall back to AF\_INET if not parsed. Only - `TreatWanIpAsLocal` parsing - the loop `"Comparing request from %s against %s/%s"` for allowedNetworks(?) - `allowedNetworks` parsing call the function only with `AF_INET`. Since IPv6 addresses do reach the server even with `EnableIPv6=0`, this implies it is impossible to allow devices that prefer IPv6. As a side note, the exception is missing the `/` since it is replaced with a `'\0'`, which might be misleading when reading the error. ---
**Author:** ![ChuckPa](https://sea1.discourse-cdn.com/plex/user_avatar/forums.plex.tv/chuckpa/32/79710_2.png) [@ChuckPa](https://forums.plex.tv/u/ChuckPa)\ **Post date:** [June 4, 2021, 6:04pm UTC](https://forums.plex.tv/t/allowednetworks-hardcoded-ipv4-format-even-with-ipv6-enabled/720498/2 "2021-06-04T18:04:23Z")
Would you please also show what you entered in “Allowed Networks” so I may give Engineering the example of what causes the failure ? that aside, I am almost 100% certain, IPv6 isn’t fully supported. I know `plex.tv` has no IPv6 support. Only www.plex.tv (general web page) is IPv6 capable. ---
**Author:** ![bloerwald](https://avatars.discourse-cdn.com/v4/letter/b/ba9def/32.png) [@bloerwald](https://forums.plex.tv/u/bloerwald)\ **Post date:** [June 4, 2021, 6:18pm UTC](https://forums.plex.tv/t/allowednetworks-hardcoded-ipv4-format-even-with-ipv6-enabled/720498/3 "2021-06-04T18:18:11Z")
Yeah, I don’t actually _want_ to use IPv6, but one of my devices insists and Plex seems to listen on v6 as well, not just v4, and I can’t seem to get either to stop doing that… My input was `fe80::c73:bd9b:28a:1159` as a concrete IP and `fe80::/10` for the “all locals” range. As per [man inet\_pton](https://man7.org/linux/man-pages/man3/inet_pton.3.html) these are valid inputs for `inet_pton (AF_INET6)`: > 1. The preferred format is x:x:x:x:x:x:x:x. This form consists of eight hexadecimal numbers, each of which expresses a 16-bit value (i.e., each x can be up to 4 hex digits). > 2. A series of contiguous zero values in the preferred format can be abbreviated to ::. Only one instance of :: can occur in an address. For example, the loopback address 0:0:0:0:0:0:0:1 can be abbreviated as ::1. The wildcard address, consisting of all zeros, can be written as ::. > 3. An alternate format is useful for expressing IPv4-mapped IPv6 addresses. This form is written as x:x:x:x:x:x:d.d.d.d, where the six leading XS are hexadecimal values that define the six most-significant 16-bit pieces of the address (i.e., 96 bits), and the ds express a value in dotted-decimal notation that defines the least significant 32 bits of the address. An example of such an address is ::FFFF:204.152.189.116. ---
**Author:** ![ChuckPa](https://sea1.discourse-cdn.com/plex/user_avatar/forums.plex.tv/chuckpa/32/79710_2.png) [@ChuckPa](https://forums.plex.tv/u/ChuckPa)\ **Post date:** [June 4, 2021, 6:37pm UTC](https://forums.plex.tv/t/allowednetworks-hardcoded-ipv4-format-even-with-ipv6-enabled/720498/4 "2021-06-04T18:37:13Z")
Thank you. May I ask which Manufacturer made the device ? ---
**Author:** ![bloerwald](https://avatars.discourse-cdn.com/v4/letter/b/ba9def/32.png) [@bloerwald](https://forums.plex.tv/u/bloerwald)\ **Post date:** [June 4, 2021, 8:03pm UTC](https://forums.plex.tv/t/allowednetworks-hardcoded-ipv4-format-even-with-ipv6-enabled/720498/5 "2021-06-04T20:03:59Z")
> [@ChuckPa](#): > > May I ask which Manufacturer made the device ? I had issues with both Apple devices and an old cheap no-name Android tablet of a friend. I convinced the Apple one by manually configuring an empty address for IPv6, but that doesn’t sound like a real solution either… ---
**Author:** ![ChuckPa](https://sea1.discourse-cdn.com/plex/user_avatar/forums.plex.tv/chuckpa/32/79710_2.png) [@ChuckPa](https://forums.plex.tv/u/ChuckPa)\ **Post date:** [June 4, 2021, 8:21pm UTC](https://forums.plex.tv/t/allowednetworks-hardcoded-ipv4-format-even-with-ipv6-enabled/720498/6 "2021-06-04T20:21:57Z")
I have multiple Apple devices. In fact, I have no Android. Does your modem/router support dual-stack TCP/IP ? Followup to that, does it support dual-stack DHCP services for the devices ? I am asking because: 1. My Modem/router is dual stack 2. My workstation is dual stack. 3. All my home devices are RFC-1918 IPv4 (including every Apple device) ---
**Author:** ![bloerwald](https://avatars.discourse-cdn.com/v4/letter/b/ba9def/32.png) [@bloerwald](https://forums.plex.tv/u/bloerwald)\ **Post date:** [June 4, 2021, 9:59pm UTC](https://forums.plex.tv/t/allowednetworks-hardcoded-ipv4-format-even-with-ipv6-enabled/720498/7 "2021-06-04T21:59:05Z")
The iOS devices seem to be defaulting to IPv4 in my setup, the iMac for some reason to IPv6, but only _sometimes_?! I had one tab logged in, using IPv4, and another (to test, incognito) using IPv6. My setup is a “bit” of a mess. Answering your post and drawing a diagram made me realize just how bonkers it is… Thanks. ```auto = WAN ===+== | (IPv6 disabled) FRITZ!Box 5490 (router) | | = LAN ===+====== ( ===========+====================+== | | | | | | Apple Time Capsule (bridge) | | | | | | = LAN 2= ( ===== ( ======+====+== | iMac | | | | | | | Synology DS920 (plex) | | | | | | | = WiFi ==+====== ( ======== ( =========== ( =======?======?== | | | | | = Guest LAN ==+==========+== | | | = Guest WiFi 1 ==+===+=================== ( =======?======?=============?== | | | | | Apple TV gen3 | | private iOS guest/work | | | | = Guest WiFi 2 ===========================+========?======?=============?== ``` - The FRITZ!Box does not allow configuring IPv6 for local networks if it is disabled on the WAN side. - The issue is probably the secondary Guest WiFi I have for legacy reasons: The Time Capsule (in Bridge mode) seems to like IPv6. The TC complains if WiFi is turned off though… - My private WiFI-capable devices randomly connect to the WiFis (since all are saved and thing are magic™), which likely is where the TC IPv6 comes into play and breaks things. tl;dr I should probably clean this up… What the hell was I thinking. I have less complex configurations with 200+ devices at work. ---
**Author:** ![ChuckPa](https://sea1.discourse-cdn.com/plex/user_avatar/forums.plex.tv/chuckpa/32/79710_2.png) [@ChuckPa](https://forums.plex.tv/u/ChuckPa)\ **Post date:** [June 4, 2021, 10:16pm UTC](https://forums.plex.tv/t/allowednetworks-hardcoded-ipv4-format-even-with-ipv6-enabled/720498/8 "2021-06-04T22:16:24Z")
My TL;DR 🙂 I wish you luck. Once you get that flattened out, you’ll be a lot happier. ---
**Author:** ![system](https://global.discourse-cdn.com/plex/original/3X/2/a/2acb9765406f63293d357b4ec509ec39aa28f2ad.png) [@system](https://forums.plex.tv/u/system)\ **Post date:** [September 2, 2021, 10:16pm UTC](https://forums.plex.tv/t/allowednetworks-hardcoded-ipv4-format-even-with-ipv6-enabled/720498/9 "2021-09-02T22:16:50Z")
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