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Diffstat (limited to 'docs/services/dns-forwarding.rst')
| -rw-r--r-- | docs/services/dns-forwarding.rst | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/docs/services/dns-forwarding.rst b/docs/services/dns-forwarding.rst index e98d7f6b..bd05395e 100644 --- a/docs/services/dns-forwarding.rst +++ b/docs/services/dns-forwarding.rst @@ -87,6 +87,14 @@ use this file to add resolvers to assigned addresses. Maximum number of DNS cache entries. 1 million per CPU core will generally suffice for most installations. +.. cfgcmd:: set service dns forwarding negative-ttl + +A query for which there is authoritatively no answer is cached to quickly deny +a record's existence later on, without putting a heavy load on the remote +server. In practice, caches can become saturated with hundreds of thousands of +hosts which are tried only once. This setting, which defaults to 3600 seconds, +puts a maximum on the amount of time negative entries are cached. + Example ======= |