Hi list, I have a question, not really about squid but I think someone maybe solved it before, so I post it here to hope to get the solution. I'm sorry if it bother you. I trying install a squid box based on newest debian amd64 to become transparent proxy. I have two NIC on box. Both of them and the rest of LAN + router connect to same switch. The topo is: NIC1-----------------------------------Sw------------------------LAN SQUID it NIC 2----------------------------------ch-----------------------Router--------------------------Internet NIC1 and NIC 2 on different subnet. (NIC 1 on LAN subnet, NIC 2 on router subnet) The problem is: when I send a ARP request from one host in LAN to NIC 1 I always get MAC address of NIC 2. Wireshark gave it more clear: Both of NIC response to request with its own MAC address. And I have some stranger problems: Some host on LAN disconnected to the Web (still ping, still ssh... but no web, maybe it is squid misconfiguration, I'm not sure) for a while. /var/log/messages full of logs on any ARP broadcast from the LAN. I try google and guess it is something ppl called arp flux, but unsure. Have you got any idea about that. Thanks for any helping. -giobuon