Gone Fishing
A beta version of AppareNet 1.5 arrived at our Real-World Labs® in Green Bay, Wis., pre-installed on a HP Compaq 1U server and equipped with both a 10/100 3Com NIC and an SMC GigEthernet NIC.
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Glossary
Black Hole Hop (RFC 1191): When packets are seemingly sucked up by a "black hole" and disappear. If a device does not negotiate the MTU (maximum transmission unit) properly and does not reply with a "fragmentation needed and DF don't fragment set" message, all packets are lost with no reply.
Duplex Mismatch: Usually the result of a failure in auto-negotiation. One end of a link operates at full duplex while the other operates at half duplex. Results in low bandwidth rates and inefficient use of the network. Gray Hole Hop: Similar to a black hole hop, but not all packets are lost. In this case, the device reports an incorrect path MTU in the "fragmentation needed and DF set" message when the DF bit is on but the path MTU is exceeded. |
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