Cabletron Systems CyberSWITCH CSX150 User Manual

Also see for CyberSWITCH CSX150: User guide Quick start guide

Contents

Small Office Remote Access Switch 89CONFIGURING B ASIC IP ROUTINGIP Network InterfacesS UBNET MASKThe Subnet Mask value (the number of significant bits for the subnet mask) associated with the IPaddress specified for this interface. The Subnet mask is specified by entering the number ofcontiguous bits that are set for the mask. The mask bits start at the most significant bit of the IPaddress field and proceed to the least significant bit. Subnet Mask applies to LAN, WAN, and WANRLAN type interfaces only. WAN Direct Host network interfaces use the subnet mask from theassociated LAN network interface.P ORTIf the interface type is LAN, then this indicates the port number on the Ethernet-2 resource to whichthe physical LAN for this interface is connected. The LAN port can support multiple networkinterfaces.If the interface type is WAN Direct Host, then this indicates the port number on the Ethernet-2resource of which this interface is a logical extension.ENCAPSULATIONIf the interface is LAN or WAN RLAN, this specifies the encapsulation type for IP datagramstransferred on this interface. Ethernet type encapsulation specifies that IP datagrams aretransferred in standard Ethernet frames as specified in RFC-894. SNAP type encapsulation specifiesthat IP datagrams are transferred in 802.3 format frames using the Sub Network Access Protocol(SNAP) as specified in RFC-1042.For multiple LAN network interfaces, you may specify different encapsulations for each.MTUThis specifies the maximum number of bytes that can be transmitted on the network interface.Some devices on the network may not be able to receive large data packets. This parameter allowsyou to maintain compatibility with these devices by setting the MTU to agree with that supportedby the device. This parameter is a decimal value from 60 to 1500, depending on the type ofdatagram encapsulation selected.For multiple LAN network interfaces, you may specify different MTU sizes for each.P ROXY ARPYou may enable or disable proxy ARP for a LAN or RLAN interface. Proxy ARP helps hosts, withno routing knowledge, communicate with hosts on other IP subnets. It works as follows: when aCyberSWITCH receives an ARP request for a host that is not on the same IP subnet as the requester,the CyberSWITCH checks to see if it provides the best route to the remote host. If it does, theCyberSWITCH will reply to this ARP request with its own MAC address. The host that has sent theARP request then communicates with the remote host by sending packets to the CyberSWITCH.The CyberSWITCH will forward those packets using standard IP routing.For multiple LAN network interfaces, the setting on the primary network interface also applies toall secondary network interfaces configured for the physical LAN port. You cannot change theproxy ARP setting on secondary network interfaces.TRANSMIT B ROADCAST A DDRESSSpecifies the transmit broadcast address on numbered interfaces (meaning all interfaces exceptinterfaces that have been defined as unnumbered). This information is used by all networkapplications (protocols) that use broadcasting capabilities. There are five selections available for thetransmit broadcast address. The first four selections are produced from the IP address that is