Hi, I am getting below error on mailgw. it has 2 ethernets. eth0 is connected to internet, while eth1 is connected to LAN where there are about 300 PCs. Mar 12 09:14:00 gateway kernel: NET: 697 messages suppressed. Mar 12 09:14:00 gateway kernel: Neighbour table overflow. Mar 12 09:14:05 gateway kernel: NET: 660 messages suppressed. Mar 12 09:14:05 gateway kernel: Neighbour table overflow. Mar 12 09:14:10 gateway kernel: NET: 682 messages suppressed. Mar 12 09:14:10 gateway kernel: Neighbour table overflow. Mar 12 09:14:15 gateway kernel: NET: 700 messages suppressed. Mar 12 09:14:15 gateway kernel: Neighbour table overflow. Mar 12 09:14:20 gateway kernel: NET: 633 messages suppressed. Mar 12 09:14:20 gateway kernel: Neighbour table overflow. it happens very often. I goolgled and found some info. many talk about below file /proc/sys/net/ipv4/neigh/default/gc_thresh1 I increased its value to 300 But, i still get the same error. any help ? -- Thank you Indunil Jayasooriya