On 11/03/2011 06:54 PM, John R Pierce wrote:
On 11/03/11 5:43 PM, Fajar Priyanto wrote:
Now, I'm adding some virtual interface eth1:0, eth1:1... so on to accommodate new subnets created in the LAN.
whats the point of having multiple subnets on the same physical LAN segment ? if you want to isolate separate local networks, you really should use separate physical adapters with separate switches... or VLAN switching if you have a switch that supports VLAN trunking.
anyways, whatever, yes, you can do it with iptables, but not all off the shelf firewall script generators will support multiple LAN subnets. I usually write my own iptables rulesets.
I can say first hand that fwbuilder easily handles managing scripts for multiple subnets and aliased addressing on NIC's. I use separate interface cards for each subnet, however. (5 NIC's, 4 internal subnets, 3 public IP's on the one external facing NIC)