@seamoose Thanks. That's pretty much the config that I had. I've now setup an 
external VM and created a wireguard tunnel from my Pi 3B+ but it still won't 
fail running iperf3. Is there a specific payload that you're transferring? 
Also, your IPv6 config, is that just the default or did you do some manual 
configuration? On my Pi:
$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP 
group default qlen 1000
    link/ether b8:27:eb:3e:ab:fb brd ff:ff:ff:ff:ff:ff
    inet 192.168.99.67/24 brd 192.168.99.255 scope global dynamic eth0
       valid_lft 860949sec preferred_lft 860949sec
    inet6 fe80::ba27:ebff:fe3e:abfb/64 scope link 
       valid_lft forever preferred_lft forever
3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP 
group default qlen 1000
    link/ether b8:27:eb:6b:fe:ae brd ff:ff:ff:ff:ff:ff
    inet 192.168.99.57/24 brd 192.168.99.255 scope global dynamic wlan0
       valid_lft 860949sec preferred_lft 860949sec
    inet6 fe80::ba27:ebff:fe6b:feae/64 scope link 
       valid_lft forever preferred_lft forever
4: wg0: <POINTOPOINT,NOARP,UP,LOWER_UP> mtu 1420 qdisc noqueue state UNKNOWN 
group default qlen 1000
    link/none 
    inet 10.241.0.1/24 scope global wg0
       valid_lft forever preferred_lft forever


** Also affects: linux-raspi (Ubuntu)
   Importance: Undecided
       Status: New

** No longer affects: linux-raspi (Ubuntu Eoan)

** Changed in: linux-raspi (Ubuntu Focal)
       Status: New => Confirmed

** No longer affects: linux-raspi2 (Ubuntu Focal)

** Changed in: linux-raspi (Ubuntu)
       Status: New => Incomplete

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You received this bug notification because you are a member of Ubuntu
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https://bugs.launchpad.net/bugs/1861936

Title:
  Raspberry Pi 3 network dies shortly after a burst of IPv6 tunnel
  network load ((lan78xx): transmit queue 0 timed out)

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