SUSE (SUSE Linux Enterprise Server 11 SP2 (x86_64)) works some time after that begin problems:
It considers hosts from another network as directly connected and sends ARP requests.
As a result hundreds entries in arp table and no connection.
example: network ip but it sends arp for etc.

after restart all is working properly some time and then again
can you please suggest me solution?

Best Regards, Andrei