Bug 408796 - Malformed UDP header in IPv6
Summary: Malformed UDP header in IPv6
Status: REPORTED
Alias: None
Product: kdeconnect
Classification: Applications
Component: android-application (other bugs)
Version First Reported In: unspecified
Platform: Other Linux
: NOR normal
Target Milestone: ---
Assignee: Albert Vaca Cintora
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2019-06-16 18:13 UTC by Pavel
Modified: 2023-09-19 15:28 UTC (History)
1 user (show)

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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.