any ideas on "ipv4: Neighbour table overflow"

As subject says, I'm getting loads of these messages in the Syslog.
Yes, I know who Ghoul is and tried setting :

/proc/sys/net/ipv4/neigh/default/gc_thresh1-3

to something insane like 32768, but it still spills my log,
any Ideas on this one ?

I'm on 'Kabel Deutschland' where Wireshark tells me everybody
is looking for everyone, that would explain all those ARP
packets cause 'noise'.

But still, there must be a way to 'ignore' this stuff, I can't
switch off ARP-replies altogether, otherwise I would not be seen...

Errm yeah, it's a Thompson modem (Cable)...


Any Ideas / Pointers ?

-rasp



PS: what do I care at all ?
It poisons my log and causes overhead :-)