# IPv6 DynDNS address

**URL:** <https://forum.torproject.org/t/ipv6-dyndns-address/15465>\
**Category:** Relay Operator\
**Created:** [October 27, 2024, 12:41pm UTC](https://forum.torproject.org/t/ipv6-dyndns-address/15465 "2024-10-27T12:41:31Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![essn](https://forum.torproject.org/letter_avatar_proxy/v4/letter/e/c89c15/32.png) [@essn](https://forum.torproject.org/u/essn)\
**Post date:** [October 27, 2024, 12:41pm UTC](https://forum.torproject.org/t/ipv6-dyndns-address/15465/1 "2024-10-27T12:41:31Z")

</div>

Hi,

I’ve tried (but not verified that it works) to set a IPv4 DynDNS address in my `torrc`:

```auto
Address torberry.ignorelist.com

```

That’s a DynDNS hostname via Freedns ([afraid.org](http://afraid.org)). I can reach port 9001 from outside via this hostname. If it works, should I see the hostname via [metrics](https://metrics.torproject.org/rs.html#search/FBBF4DFFC152A980E57ABF2BFB33BF8329B591EA)?

For IPv6 the connections are not working yet, although I can access the ORPort via IPv6 address from outside.

First, Tor somehow finds and advertises an IP address that I dunno where it’s coming from (in the log):

```auto
Auto-discovered IPv6 address [...]:9001 has not been found reachable. However, IPv4 address is reachable.

```

I can’t see this address via `ifconfig` and wonder why it doesn’t choose one of the global IPv6 addresses stated by `ifconfig`.

Second, I’m trying to set up a kind of DynDNS with my Fritz!Box router (MyFritz). Am I missing a corresponding option like `Address` for an IPv6 hostname?

Not sure with IPv6, but would it need another hostname than for IPv4 DynDNS? (anyway, I can’t get IPv6 working via FreeDNS, and chances sem better via Fritz!Box / MyFritz).

**Edit:**  
I’ve found that it’s possible to use _Address_ twice ([here](https://github.com/boldsuck/tor-relay-bootstrap/blob/master/etc/tor/torrc) and [here](https://lists.torproject.org/pipermail/tor-relays/2020-July/018748.html)).

So for IPv4 I use the DynDNS hostname, and for IPv6 an address via which I can connect to the Tor service via _telnet_.  
But after a SIGHUP the log still shows the same IPv6 address as “auto-discovered” and tells it can’t be reached.  
It’s a bit confusing, because [here](https://community.torproject.org/de/relay/setup/post-install/) they set the ORPort a second time, once for IPv4 and once for IPv6.  
I’ve set the _ORPort_ to _9001_ without any address, and it’s a bit confusing…should I also put the addresses into _ORPort_?

**Edit 2:**  
Using the _Address_ field twice (IPv4 hostname and IPv6 address) seems okay in the Tor relay’s log, but metrics report it as down. The first time I see a disagreement between what the service (journalctl) and what Tor metrics is reporting. So I’m switching back.

---

<div class="post-metadata">

**Author:** ![essn](https://forum.torproject.org/letter_avatar_proxy/v4/letter/e/c89c15/32.png) [@essn](https://forum.torproject.org/u/essn)\
**Post date:** [October 28, 2024, 7:31pm UTC](https://forum.torproject.org/t/ipv6-dyndns-address/15465/2 "2024-10-28T19:31:08Z")

</div>

I can’t edit anymore, but Tor metrics still tells that my relay is down, while my relay tells that it got 30 days uptime and is still running. It doesn’t report any problems, as far as I can tell.