12 Troubleshooting FundamentalsTable 5 "Interpreting an TCP traffic dump" (page 12) gives the informationabout TCP dump entry and its description.Table 5Interpreting an TCP traffic dumpDump entry Description IP >: sequence number> ack of next data> win Urg options>It is a TCP connection between a source anddestination. Flag values are S (SYN), F (FIN), P(PUSH), R (RST), or a single period (no falgs).The data sequence space covered by the datain this packet. Ack is the sequence number ofthe next data expected in the other direction onthis connection. Window number is the numberof bytes of receive buffer space available in theother direction on this connection. Urg indicatesthere is urgent data in the packet. TCP optionsare enclosed in angle brackets.NVG hardwareThis section provides information to troubleshoot problems related to theNortel VPN Gateway hardware components.Table 6 "Front Panel LEDs" (page 12) describes the Front Panel LEDindicators on the VPN Gateway.Table 6Front Panel LEDsLED Indicator (from left to right) DescriptionAmber system status LED The amber system status LED lightsup when the system needs attentiondue to a problem with power supplies,fans, CPU, or system temperature.Hard-disk drive activity LED This LED blinks when activity isdetected on the hard-disk drive.System power LED This LED is green when the powersupply is turned on.ATTENTIONCall Nortel for RMA if Amber System status LED can not be cleared.Virtual IP addressesIn instances where virtual IP addresses are used without an external loadbalancer, ensure that the effected services are set to standalone mode.Nortel VPN GatewayTroubleshooting GuideNN46120-700 01.01 Standard12 October 2007Copyright © 2007 Nortel Networks.
