netdev - Re: NFS over NAT causes e1000e transmit hangs

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Date:   Tue, 18 Apr 2017 12:03:24 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     intel-wired-lan@...ts.osuosl.org, jeffrey.t.kirsher@...el.com,
        netdev@...r.kernel.org
Subject: Re: NFS over NAT causes e1000e transmit hangs

On Tue, 2017-04-18 at 11:18 -0700, Florian Fainelli wrote:
> Hi,
> 
> I am using NFS over a NAT with two e1000e adapters and with eth1 being
> the LAN interface and eth0 the WAN interface. The kernel is Ubuntu's
> 16.10 kernel: 4.8.0-46-generic. The device doing NAT over NFS is just
> mounting a remote folder and doing normal execution/file accesses. It's
> enough to untar a file from this device onto a NFS share to expose the
> problem.
> 
> The transmit hangs look like the ones below, doing a rmmod/insmod does
> not help eliminated the problem, nor does a power cycle. Stopping the
> NFS over NAT definitively does let the adapter recover.

Is this NFS over TCP or UDP ?

Thanks !