Squid configuration directive dns_v4_fallback
Available in: 3.1
This directive is not available in the v7 version of Squid.
This directive is not available in the v6 version of Squid.
This directive is not available in the v5 version of Squid.
This directive is not available in the v4 version of Squid.
For older versions than v4 see the linked pages above
Configuration Details:
Option Name: | dns_v4_fallback |
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Replaces: | |
Requires: | --enable-internal-dns |
Default Value: | dns_v4_fallback on |
Suggested Config: |
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Standard practice with DNS is to lookup either A or AAAA records and use the results if it succeeds. Only looking up the other if the first attempt fails or otherwise produces no results. That policy however will cause squid to produce error pages for some servers that advertise AAAA but are unreachable over IPv6. If this is ON squid will always lookup both AAAA and A, using both. If this is OFF squid will lookup AAAA and only try A if none found. WARNING: There are some possibly unwanted side-effects with this on: *) Doubles the load placed by squid on the DNS network. *) May negatively impact connection delay times. |
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