ARP weirdness.
Ken D'Ambrosio
ken at jots.org
Wed Nov 8 16:49:41 EST 2017
Hey, guys. Have an Ubuntu box acting as a router for some subnets. I
have one VLAN, 1302, on which subnet 192.168.200.0/24 resides. The
network looks a bit like this:
[192.168.200.12] <-1302 VLAN->[switch]<-1302 VLAN->switch<-1302 VLAN->
[router @ 192.168.200.1]
The link is getting utterly spammed with ARP requests for
192.168.200.12. Tens of thousands a second. AND it's also getting
spammed (at a much reduced rate) with ARP responses. That, in-and-of
itself is already pretty confusing. But what trumps it is the fact that
the Linux box *already has 192.168.200.12 and the corresponding MAC in
its local ARP table*. Thus precluding the need to even make ARP
requests, much less tens of thousands a second. The box has been
booted; it made no apparent difference.
W. T. F.
I'm kinda stumped on this, and would gladly accept any ideas...
Thanks,
-Ken
More information about the gnhlug-discuss
mailing list