Bug 408796

Summary:	Malformed UDP header in IPv6
Product:	[Applications] kdeconnect	Reporter:	Pavel <ao>
Component:	android-application	Assignee:	Albert Vaca Cintora <albertvaka>
Status:	REPORTED ---
Severity:	normal	CC:	uwu
Priority:	NOR
Version First Reported In:	unspecified
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Pavel 2019-06-16 18:13:38 UTC

I was trying to connect my phone to PC, manually entering IP address.
There is a router between them (Mikrotik with RouterOS) because the phone is registered in guest Wi-Fi network which is separated from my main LAN.

There's no problem when I enter an IPv4 address manually.

If I enter my PC's IPv6 address:

1. UDP packet for port 1716 goes through the firewall in router and goes out. However, if I capture it with packet sniffer and and take a look in Wireshark, I see some raw data instead of parsed UDP header.
2. When the packet arrives to PC's network interface, tcpdump also complains:

12:51:27.744727 IP6 xxxx:xxxx:xxxx:xxxx:7caf:3c9d:1c29:ab4d > fdd5:e0e1:b7b1:1e33::ee: frag (0|1448) 48200 > 1716: UDP, bad length 1461 > 1440

I'm running KDE Connect 1.12.7 on Android 9.