Ok, riddle me this:
/kernel: arplookup WWW.XXX.YYY.10 failed: host is not on local network
I've been seeing these messages in the messages log, so I've done some
additional tests and am now hunting for answers.
The curious part is, the host technically *is* on the local network.
It's a /24 subnet; the address of the local machine is WWW.XXX.YYY.25
and the other host is WWW.XXX.YYY.10. As I mentioned, this is a /24,
and so I've confirmed that both hosts are configured with the subnet
mask of 0xff00 (255.255.255.0).
I can repeat the error message as often as I want by generating arp
who-has requests (I've been using `arping' to accomplish these tests):
tcpdump output when running arping:
arp who-has WWW.XXX.YYY.10 tell WWW.XXX.YYY.25
arp reply WWW.XXX.YYY.10 is-at 0:e0:81:2:15:59
At the same time, my messages log fills up with arplookup errors.
/kernel: arplookup WWW.XXX.YYY.10 failed: host is not on local network
Now, I must add a necessary development to this, which is almost
definitely the cause of the problem. These two hosts each have two
interfaces on them. The primary interface on each is connected to
WWW.XXX.YYY.0/24 as shown above. The secondary interface on each is
assigned RFC1918 addresses on the 172.16.1.0/24 subnet, and are directly
connected with a crossover cable. The last octet used in the IP
addresses for the secondary interfaces mirror the last octet used for
the IP on the primary interfaces. Static routes have been added to
force all communication *between* these two hosts to use the secondary
interfaces:
WWW.XXX.YYY.25's static route:
route add WWW.XXX.YYY.10 172.16.1.10
WWW.XXX.YYY.10's static route:
route add WWW.XXX.YYY.25 172.16.1.25
The static routes work as they should - traffic destined for either
host's IP on the WWW.XXX.YYY.0/24 subnet goes through the secondary
interfaces instead. However, both machines are receiving the arplookup
errors because of this, and I'd like to know if there is a solution
besides disabling the sysctl variable that causes these errors to be logged.
Thanks!
-David Fuchs
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