netdev - Fw: [Bug 205687] New: VXLAN from ipv6 is not sending ipv6 fragmetation pachets

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Message-ID: <20191127160049.79e74101@hermes.lan>
Date:   Wed, 27 Nov 2019 16:00:49 -0800
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     netdev@...r.kernel.org
Subject: Fw: [Bug 205687] New: VXLAN from ipv6 is not sending ipv6
 fragmetation pachets

Looks like a UDP PMTU related issue?

Begin forwarded message:

Date: Wed, 27 Nov 2019 23:46:00 +0000
From: bugzilla-daemon@...zilla.kernel.org
To: stephen@...workplumber.org
Subject: [Bug 205687] New: VXLAN from ipv6 is not sending ipv6 fragmetation pachets


https://bugzilla.kernel.org/show_bug.cgi?id=205687

            Bug ID: 205687
           Summary: VXLAN from ipv6 is not sending ipv6 fragmetation
                    pachets
           Product: Networking
           Version: 2.5
    Kernel Version: 5.3.13-arch1-1
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Other
          Assignee: stephen@...workplumber.org
          Reporter: ne-vlezay80@...dex.ru
        Regression: No

ens3 mtu is 9000 bytes. Internal and guest network mtu 65535 bytes.

Sending packet to guest network:

#> ip netns exec test ping -s 8700 fd00::6  
PING fd00::6(fd00::6) 8700 data bytes
8708 bytes from fd00::6: icmp_seq=1 ttl=64 time=0.674 ms
8708 bytes from fd00::6: icmp_seq=2 ttl=64 time=0.648 ms
^C
--- fd00::6 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1008ms
rtt min/avg/max/mdev = 0.648/0.661/0.674/0.013 ms
[root@...h user (0)]
#> ip netns exec test ping -s 32768 fd00::6  
PING fd00::6(fd00::6) 32768 data bytes
^C
--- fd00::6 ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 1022ms

[root@...h user (1)]
#>   


Send big backet from ipb6 is failure from vxlan.

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