ZyXEL ISG50-PSTN User Guide - Page 234
Types of Interfaces
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Chapter 12 Interfaces • Many interfaces can share the same physical port. • An interface belongs to at most one zone. • Many interfaces can belong to the same zone. • Layer-3 virtualization (IP alias, for example) is a kind of interface. Types of Interfaces You can create several types of interfaces in the ISG50. • Setting interfaces to the same port role forms a port group. Port groups create a hardware connection between physical ports at the layer-2 (data link, MAC address) level. • Ethernet interfaces are the foundation for defining other interfaces and network policies. RIP and OSPF are also configured in these interfaces. • VLAN interfaces receive and send tagged frames. The ISG50 automatically adds or removes the tags as needed. Each VLAN can only be associated with one Ethernet interface. • Bridge interfaces create a software connection between Ethernet or VLAN interfaces at the layer-2 (data link, MAC address) level. Unlike port groups, bridge interfaces can take advantage of some security features in the ISG50. You can also assign an IP address and subnet mask to the bridge. • PPP interfaces support Point-to-Point Protocols (PPP). ISP accounts are required for PPPoE/PPTP interfaces. • Cellular interfaces are for 3G WAN connections via a connected 3G device. • Virtual interfaces provide additional routing information in the ISG50. There are three types: virtual Ethernet interfaces, virtual VLAN interfaces, and virtual bridge interfaces. • Trunk interfaces manage load balancing between interfaces. Port groups and trunks have a lot of characteristics that are specific to each type of interface. See Section 12.2 on page 236 and Chapter 13 on page 281 for details. The other types of interfaces-Ethernet, PPP, cellular, VLAN, bridge, and virtual--have a lot of similar characteristics. These characteristics are listed in the following table and discussed in more detail below. Table 61 Ethernet, PPP, Cellular, VLAN, Bridge, and Virtual Interface Characteristics CHARACTERISTICS ETHERNET ETHERNET PPP CELLULAR VLAN Name* wan1, wan2 lan1, lan2, dmz pppx cellularx vlanx Configurable Zone No No No No Yes IP Address Assignment Static IP address Yes Yes Yes Yes Yes DHCP client Yes No Yes Yes Yes Routing metric Yes Yes Yes Yes Yes Interface Parameters Bandwidth Yes Yes restrictions Yes Yes Yes Packet size (MTU) Yes Yes Yes Yes Yes DHCP DHCP server No Yes No No Yes DHCP relay No Yes No No Yes Connectivity Check Yes No Yes No Yes BRIDGE brx Yes Yes Yes Yes Yes Yes Yes Yes Yes VIRTUAL ** No Yes No Yes Yes No No No No 234 ISG50 User's Guide