![]() To actually find a gateway configured by someone else, you need to know its MAC address (by ARP) and locate that MAC address in the switch's source address table. Those connections can be physical - one link for each VLAN, or logical - a single physical link with logical subinterfaces and trunked VLANs. Of course, an external gateway needs to be connected to each VLAN it's supposed to provide gateway services to. The gateway can be part of a layer-3 switch ("switch virtual interface" on Cisco) or it can be attached externally to the switch. If the 103.19.1.0/25's gateway IP address is 103.19.1.1, so whether does the gateway's location? Find your external IP by going to your router’s configuration page and opening your Router Status. Your IP address will be displayed next to the inet entry. ![]() Open Terminal and type the following: ifconfig grep 'inet ' grep -v 127.0.0.1. ![]() That in turn requires proper addressing which can be accomplished using subnetting. In OS X 10.4, go to the TCP/IP tab to view the IP address. Subnetting is a layer 3 mechanism - while it is most often closely related to VLANs, both are distinct aspects: nodes in different VLANs cannot communicate with each other by definition (on L2), but those nodes can use the network layer to communicate across a gateway/router. While VLANs separate L2 traffic they don't use IP addresses nor do L2 switches. Yes, a managed switch can separate its traffic into multiple VLANs.
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