Black Box 16 port, 24 port manual Host problems, 253

•if your network is congested, subnet it with a bridge; however, bear in mind the recommendations in the previous paragraph.

Host problems

Cannot access a host by name

•if using DNS or if DNS is required, ensure a nameserver is configured on your unit and is accessible (ping it).

•if not using DNS, ensure the host is configured in the host table. Check access to the host by pinging it using the host’s IP address.

Cannot access a host on a local network

ensure:

•the network address is correct.

•the subnet mask is set correctly and reflects the network configuration.

•the broadcast address is set correctly and reflects the network configuration.

Cannot access a host on a remote network

•use the show route command to verify that there is a route to the remote host. If no gateway is specified, ensure a default gateway is specified. Ping the default gateway to check if it is working.

•Consider the situation beyond the gateway; e.g. are intermediate gateways and the remote host available? Also, check the messages returned by the show route command; e.g. that a particular host or gateway is unreachable.

Gateways added into the gateway table are ignored by the unit

•have you used BOOTP and entered a single static gateway in the bootptab file entry? If yes, the other gateways will be ignored. See Appendix F BOOTP for more information

Black Box Console Server user guide 253