3Com OfficeConnect 3CRWDR200A-75 User Manual

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3Com OfficeConnect 3CRWDR200A-75 User Manual Manual pdf 106 page image

106 CHAPTER 6: T ROUBLESHOOTINGAlert LED The Alert LED will flash when the Router unit is first powered up whilethe system software checks the hardware for proper operation. Once theRouter has started normal operation, the Alert LED will go out.■ If the Alert LED does not go out following start up, but illuminatescontinuously, this indicates that the software has detected a possiblefault with the hardware. Remove power from the Router, wait 10seconds and then re-apply power. If the Alert LED comes oncontinuously again, then a fault has been detected. Locate the copy ofthe Router software on the accompanying CD-ROM or 3Com web site(http://www.3com.com) and upload it to the Router to see if thisclears the fault (refer to “Recovering from Corrupted Software”below). If this does not fix the problem, contact your supplier forfurther advice.■ During normal operation, you may notice the Alert LED lighting brieflyfrom time to time. This indicates that the Router has detected a hackerattack from the Internet and has prevented it from harming yournetwork. You need take no specific action on this, unless you decidethat these attacks are happening frequently in which case you maywish to discuss this with your ISP. The Router logs such attacks, andthis information is available through the Status and Logs screens.Recovering fromCorrupted SoftwareIf the Alert LED remains permanently on following power-up, it is possiblethat the system software has become corrupted. In this condition, theRouter will enter a “recovery” state; DHCP is disabled, and the LAN IPaddress is set to 192.168.1.1. Follow the instructions below to upload anew copy of the system software to a Router unit in this state.Ensure that one of your computers has a copy of the new software imagefile stored on its hard disk or available on CD-ROM.The latest software is available on 3Com’s Web site at:http://www.3com.com1 Remove power from the Router and disconnect all your computers,except for the one computer with the software image.2 You will need to reconfigure this computer with the following static IPaddress information: