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TCP/IP Symptoms and Problems: Summary Sheet
361
TCP/IP Symptoms and Problems: Summary
Sheet
T
able 6.14 lists several common TCP/IP symptoms and their probable
causes.
T A B L E 6 . 1 4
TCP/IP Symptoms and Causes
Symptom
Problems
Local host cannot
communicate with
a remote host
(a) DNS not working properly
(b) no route to remote host
(c) missing default gateway
(d) administrative denial (access lists)
Certain applica-
tions won't work
properly
(a) administrative denial (access lists)
(b) network not configured to handle the application
Booting failures
(a) BootP server did not have an entry for the MAC
address
(b) missing IP helper-address
(c) access lists
(d) change in the NIC or MAC address
(e) duplicate IP address
(f) improper IP configuration
Can't ping a
remote station
(a) access lists
(b) no route to host
(c) no default gateway set
(d) remote host down
Missing routes
(a) improper routing protocol configuration
(b) distribute lists
(c) passive interface (doesn't receive updates)
(d) neighbor not advertising routes
(e) protocol version mismatch
(f) neighbor relation not established
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