Cabletron Systems CyberSWITCH CSX150 User Manual

Also see for CyberSWITCH CSX150: User guide Quick start guide

Contents

USER’S GUIDE398 CyberSWITCHProblem:The DHCP Proxy Client is enabled, and it has opened its UDP port, but there aren’t any “DHCP-obtained” addresses in the IP Address Pool.Action:1. Check the DHCP-related configuration for WAN and WAN (Direct Host) IP network interfaceswhich should have IP addresses obtained from DHCP servers for them. Use CFGEDIT, or usetheipnetif command from Manage Mode. Correct if necessary.2. Make sure that the LAN port to reach the DHCP server on for the interface is correct.3. If the DHCP server is on a directly-connected LAN, you should be able toping it successfullyfrom the CyberSWITCH. If you cannot, check the LAN port IP configuration; make sure theDHCP server is operational.4. If the DHCP server is not on the directly-connected LAN, a DHCP Relay Agent must be. Arelay agent is required in order to successfully forward DHCP packets to a DHCP server on adifferent sub-network.5. Assuming that a DHCP Relay Agent is present on the directly-connected LAN, you can attempttoping the DHCP server. This may require the addition of IP static routes on both theCyberSWITCH and the DHCP server. These static routes are required for smooth operation ofthe DHCP protocol.6. If the DHCP server is not on a directly-connected LAN, another test may be performed. If at allfeasible, place a DHCP client workstation on the same LAN with the server. See if this DHCPclient can obtain an IP address from the DHCP server.P ROXY ARP O PERATIONProblem:Two IP hosts devices on different subnets in an IP network are unable to communicate across theWAN.Action:1. On both CyberSWITCH platforms, issue theipnetif manage mode command to make surethat the proxy ARP feature is enabled for the LAN interface. If it is not enabled on one or bothof the CyberSWITCH platforms, enable it through the CFGEDIT configuration utility. Notethat you have to restart the system for the changes to be effective.2. On both platforms, issue theipnetif manage mode command to make sure the LANinterfaces are configured with the proper subnet mask. Configure these platforms with theproper subnet masks, not the natural masks.3. On both platforms, issue theiproute manage mode command to make sure that each systemknows about the IP subnet at the other Ethernet segment.4. If the two IP host devices still can not communicate with each other, contact your Distributoror Customer Support.