Squid: The Definitive Guide
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| test_reachability |
When you enable this directive, Squid looks at its netdb database while processing ICP queries. If Squid normally returns ICP_MISS , but the origin server isn't in the database or doesn't respond to ICMP pings , it returns ICP_MISS_NOFETCH instead. The ICP_MISS_NOFETCH reply signals the neighbor cache that Squid might not be able to communicate with the origin server.
| Syntax | test_reachability onoff |
| Default | test_reachability off |
| Example | test_reachability on |
| Related | pinger_program , query_icmp , netdb_ping_period |
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