[ale] Strange Linux networking issue
derek at ihtfp.com
Mon Apr 19 13:06:07 EDT 2021
I'm having a strange networking issue between two AWOW devices running
Linux that stopped talking to each other. The devices are configured as
--(a)[Box 1](b) ----- (c)[Box 2](d)--
(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?
Derek Atkins 617-623-3745
derek at ihtfp.com www.ihtfp.com
Computer and Internet Security Consultant
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