[ale] Strange Linux networking issue

[Boris Borisov]

You have 2 network cards per device. Why not separate network between 1 and
2.




On Mon, Apr 19, 2021, 13:06 Derek Atkins via Ale <ale at ale.org> wrote:

> HI.
>
> I'm having a strange networking issue between two AWOW devices running
> Linux that stopped talking to each other.  The devices are configured as
> below:
>
> --(a)[Box 1](b) ----- (c)[Box 2](d)--
>
> Where:
> (a) is 172.16.5.0/16
> (b) is 172.16.5.1/16
> (c) is 172.16.7.100/16
> (d) is 172.16.7.0/16
>
> The (b)/(c) link is a direct link between the devices, not a crossover
> cable, and no switch.
>
> The two devices were talking fine for a while and then all of a sudden
> they stopped.  Now that won't talk at all.  When truing to ping .7.100
> from Box 1, it sends out ARPs but there is no ARP response from Box 2.
> Similarly, on Box 2 trying to ping .5.1 results in no ARP responses.
>
> Both devices show the (b)/(c) link as up.  Running ethtool shows the link
> is detected.  However arp -an shows an incomplete response (no surprise).
>
> The dmesg output doesn't show anything.
>
> I am at a loss. I don't understand how or why the two devices would stop
> talking, and why neither will pick it up again.
>
> Any suggestions for where to look or how else to debug this?
>
> Thanks,
>
> -derek
>
> --
>        Derek Atkins                 617-623-3745
>        derek at ihtfp.com             www.ihtfp.com
>        Computer and Internet Security Consultant
>
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