test_reachability

test_reachability

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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