Significant Dropped Packets on WG interface

Roman Mamedov rm at
Thu May 14 11:15:08 CEST 2020

On Thu, 14 May 2020 16:35:30 +0930
Mike O'Connor <mike at> wrote:

> Hi All
> For the last few weeks my Wireguard link which I use to as my default
> gateway has been having issues with TCP connections stalling.
> I've been trying to work out what is wrong. I just noticed that the
> Wireguard link has dropped packets at both ends.
> wg-p2p    Link encap:UNSPEC  HWaddr
> 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
>           inet addr:  P-t-P: 
> Mask:
>           inet6 addr: 2506:c500:ff4:1::ab/64 Scope:Global
>           inet6 addr: fe80::e6/64 Scope:Link
>           UP POINTOPOINT RUNNING NOARP  MTU:1500  Metric:1

Reduce MTU of the WG interfaces to accomodate for overhead. See for
calculations of by how much.

>           inet6 addr: 2506:c500:ff4:1::aa/64 Scope:Global

I wonder what's this IP range, is this some VPN service? Squatting on
unassigned IPs within 2000::/3 seems like a very bad practice. If they wanted
an imaginary GUA for their NAT66, I'd suggest something like 66::/16 instead.

With respect,

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