On Mon, 21 Aug 2017 07:26:04 -0700
Rick Moen <rick@???> wrote:

> > On Sun, 20 Aug 2017 21:30:00 -0700 Rick Moen <rick@???>
> > wrote:
> >
> > > However_, even given that, in my experience any reshuffle USB would
> > > add to the _existing_ devices' node assignments would occur only at
> > > reboot time _if_ you left the USB device plugged in.
> >
> > Personal experience: I run an IPCop box as a firewall for my LAN,
> > using three USBtoRJ45 interfaces in an attempt to reduce the
> > motherboard damage from thunderstorms (I live in Darkest Paraguay).
> >
> > The local electricity system is not all that reliable, and even with a
> > UPS the box gets rebooted several times a week.
> >
> > In around ten years of use I have never had the problem of USB/NIC
> > assignment changing at reboot, except when I had to replace a
> > burnt-out USBtoRJ45 ;-3(
>
> Interesting and thank you. At first, I thought you were going to post
> Yet Another USB Flakiness Story, but it turns out that your NICs have
> _not_ self-reassigned. Good to know.
>
> FWIW, when I wrote the above, I actually had in mind mass storage, e.g.,
> a system has /dev/sda on one HBA and /dev/sdb on another, mounts a USB
> mass storage device as /dev/sdc, and then reboots with the USB mass
> storage device plugged in and now finds that the USB device is /dev/sdb
> in-between the two persistent devices with the result that /etc/fstab is
> wrong. (Probably, the admin curses a blue streak and switches to UUID
> referencing or disk labels.)
>
> One thing that people definitely _do_ bitch about is USB casual storage
> being (say) /dev/sdc upon one insertion and then later /dev/sdd at the
> next insertin (without a reboot between). From my perspective, I never
> saw this as a problem. You just observe the inserted device's node by
> looking at dmesg | tail, su to root, mount device, done. But the
> new-user people don't like that, and want the process to be automagic.
> Greg Kroah-Hartman justified the whole udev thing to me, claiming it
> needed to be on all Linux systems, on grounds that he wanted his
> daughter to be able to use USB devices without needing to be root. I
> replied that happily he could do anything for his daughter he wished on
> his _own_ systems, but that his daughter wouldn't be plugging USB
> devices into my servers, so I wasn't especially interested in helping
> her there.

I forgot to precise that the three USBtoRJ45 are the same model, TrendNet TU2-ET100.

Cheers,

Ron.
-- 
            Like some infernal monster, still venomous in death, 
     a war can go on killing people for a long time after it’s all over.
                                                                     -- Nevil Shute Norway

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