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| author | Jeremy Harris <jgh146exb@wizmail.org> | 2018-06-07 18:08:22 +0100 |
|---|---|---|
| committer | Jeremy Harris <jgh146exb@wizmail.org> | 2018-06-07 18:08:22 +0100 |
| commit | d8d9f9301c9a31c826635bbdd334bb4be99ea05a (patch) | |
| tree | 1bfd0accaea8555d5eea9333fc56903de8b050a1 /doc/doc-docbook/spec.xfpt | |
| parent | 7b9822bffe67da2a43a82d12caf5db00a3ed71c2 (diff) | |
Follow CNAME chains only one step. Bug 2264
Diffstat (limited to 'doc/doc-docbook/spec.xfpt')
| -rw-r--r-- | doc/doc-docbook/spec.xfpt | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt index c4b3837da..431d4560c 100644 --- a/doc/doc-docbook/spec.xfpt +++ b/doc/doc-docbook/spec.xfpt @@ -13873,6 +13873,7 @@ listed in more than one group. .row &%av_scanner%& "specify virus scanner" .row &%check_rfc2047_length%& "check length of RFC 2047 &""encoded &&& words""&" +.row &%dns_cname_loops%& "follow CNAMEs returned by resolver" .row &%dns_csa_search_limit%& "control CSA parent search depth" .row &%dns_csa_use_reverse%& "en/disable CSA IP reverse search" .row &%header_maxsize%& "total size of message header" @@ -14775,6 +14776,19 @@ This option controls whether or not an IP address, given as a CSA domain, is reversed and looked up in the reverse DNS, as described in more detail in section &<<SECTverifyCSA>>&. +.new +.option dns_cname_loops main integer 1 +.cindex DNS "CNAME following" +This option controls the following of CNAME chains, needed if the resolver does +not do it internally. +As of 2018 most should, and the default can be left. +If you have an ancient one, a value of 10 is likely needed. + +The default value of one CNAME-follow is needed +thanks to the observed return for an MX request, +given no MX presence but a CNAME to an A, of the CNAME. +.wen + .option dns_dnssec_ok main integer -1 .cindex "DNS" "resolver options" |