On 2016-06-14, at 15:10, Eric Dumazet <eric.dumazet@gmail.com> wrote:
>> What gives :
>> sysctl net/ipv4/ip_no_pmtu_disc net/ipv4/tcp_mtu_probing

net.ipv4.ip_no_pmtu_disc = 0
net.ipv4.tcp_mtu_probing = 0

> Also, is it a regression ? Was this working better with an older linux
> version ?

No idea, 4.6.0 is the only kernel I ran this on (is a new project). What would be a good older version to check?

Thanks,
Lars