I have a simple Zentyal installation with 2 network cards (virtual).
Eth0 is for WAN
Eth1 is for LAN
Sometimes the LAN interface has a short timeout period. I tracked the problem down to a ARP command:
for arptable in `arp | grep "eth1" | cut -d " " -f1`; do arp -d $arptable; done
This command deletes the arp entries on eth1. If I run this, all LAN access is normal again.
How can I stop these sudden timeout moments?