我在一个域上执行了一个SOA nslookup,我对输出的确切含义有点困惑(见下面…名称已经改变,以保护无辜):
;; QUESTION SECTION: ;MYDOMAIN.COM. IN SRV ;; AUTHORITY SECTION: MYDOMAIN.COM. 10800 IN SOA dns23429.dizinc.COM. somename.hotmail.COM. 2010072201 86400 7200 3600000 86400
所以我明白“dns23429.dizinc.com”是权威的DNS服务器,但是之后的条目(“somename.hotmail.COM”)是什么意思? 那是另一个权威的DNS服务器吗? 我不认为你可以有两个权威的服务器。 另外,为什么会在“hotmail.com”域名的机器上? 这似乎有点奇怪不是吗?
SOA开始的权限logging有几个值。
从rfc1035
MNAME RNAME SERIAL REFRESH RETRY EXPIRE MINIMUM MNAME The <domain-name> of the name server that was the original or primary source of data for this zone. RNAME A <domain-name> which specifies the mailbox of the person responsible for this zone. SERIAL The unsigned 32 bit version number of the original copy of the zone. Zone transfers preserve this value. This value wraps and should be compared using sequence space arithmetic. REFRESH A 32 bit time interval before the zone should be refreshed. RETRY A 32 bit time interval that should elapse before a failed refresh should be retried. EXPIRE A 32 bit time value that specifies the upper limit on the time interval that can elapse before the zone is no longer authoritative.
所以那个logging。
MYDOMAIN.COM. 10800 IN SOA dns23429.dizinc.COM. somename.hotmail.COM. 2010072201 86400 7200 3600000 86400
“somename.hotmail.COM”实际上是“[email protected]”作为电子邮件联系人。