Transmission 3.0 - IPv6 UPnP "mangling"

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vom513
Posts: 4
Joined: Thu Sep 13, 2018 4:30 pm

Transmission 3.0 - IPv6 UPnP "mangling"

Post by vom513 » Sat May 23, 2020 5:30 pm

Hello,

First - congrats on the release !

Looks like when I fire up the new release (this is on latest Catalina - 10.15.4) - there is a UPnP request (IGD2) that looks like it "mangles" my IPv6 address into something like an IPv4 address / field.

My firewall log shows this:

Code: Select all

May 23 13:17:13 ice miniupnpd[1542]: Failed to convert hostname '2607:fcc8:8ac2:a' to ip address
May 23 13:17:13 ice miniupnpd[1542]: Failed to convert hostname '2607:fcc8:8ac2:a' to ip address
You can kind of see that the data looks like it was trying to cram an IPv6 address into an IPv4 format...

Here is a screenshot from Wireshark showing the offending request:

https://imgur.com/a/yG5c9Tb

The IPv4 mapping (NAT-PMP) works just fine by the way.

PS: I have a pcap as well if any developers want me to share privately - let me know how to get it to you. I managed to filter and just catch the UPnP conversation and you can see the request and the (code 500) error from miniupnpd.

Thanks.

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