Hi, I have a router 1721 router with 2 WAN Interface Cards (WICs) and 1 buildin fastethernet: WIC-1ENET -> USED FOR INTERNET CONNECTIONS: 1) Ethernet0 = is connected to a TV cable modem (for internet browsing etc..) and gets it's ip address from a dhcp server BUILDIN FASTETHERNET: 2) fastethernet0 = 172.16.43.1 This ethernet is connected to a third-party switch (from TRENDNET) where I have my home network connected: 172.16.43.0 / 255.255.255.0 All PCs get there ip address from a dhcp server running on the cisco router. I have bought a WIC-4ESW Cisco 4-Port Fast Ethernet Switch WAN Interface Card Which are: 3) fastethernet1 4) fastethernet2 5) fastethernet3 6) fastethernet4 I would like to connect a PC to fastethernet1 (from WIC-4ESW ) with an ip address of 172.16.1.1 a) The pc (with IP 172.16.1.1) should be able to ping any host on the internet b) The pc (with IP 172.16.1.1) should be able to ping any host on the network 172.16.43.0 c) The network 172.16.43.0 should be able to ping the 172.16.1.1 host How do I have to configure the vlan stuff etc....? Unfortunately I have no experience and no idea how to do a vlan configuration. So "any" help (links, books etc) would be greatly appreciated. Thanks in advance