| Parent | pass | NS records at parent servers | Your NS records at the parent servers are: osi2.gua.net. osi.gua.net. [These were obtained from ns.dns.br.] |
| warn | Glue at parent nameservers | WARNING. The parent servers (I checked withns.dns.br.) are not providing glue for all your nameservers. This means that they are supplying the NS records (host.example.com), but not supplying the A records That may cause some extra miliseconds in DNS. This will usually occur if your DNS servers are not in the same TLD as your domain | |
| NS | info | NS records at your nameservers | Your NS records at your nameservers are: At 205.161.188.3 osi2.gua.net. [205.161.188.3 ] osi3.gua.net. [205.161.188.4 ] 205.161.188.2 Lame nameserver |
| skip | Mismatched glue | Skip comparing the glue provided by the parent servers and that provided by your authoritative DNS servers, as root servers do not provide glue | |
| pass | No NS A records at nameservers | OK. Your nameservers do include corresponding A records when asked for your NS records. This ensures that your DNS servers know the A records corresponding to all your NS records. | |
| fail | All nameservers report identical NS records | ERROR. The NS records at all your nameservers are different, check the info above for details. | |
| pass | All nameservers respond | OK. All of your nameservers listed at the parent nameservers responded. | |
| pass | Nameserver name validity | OK. All of the NS records that your nameservers report seem valid (no IPs or partial domain names). | |
| pass | Number of nameservers | OK. You have 2 nameservers. You must have at least 2 nameservers (RFC2182 section 5 recommends at least 3 nameservers), and preferably no more than 7. | |
| fail | Lame nameservers | ERROR: lame nameservers: osi.gua.net. [205.161.188.2] | |
| fail | Missing (stealth) nameservers | ERROR: stealth nameservers (nameservers what does not exist at root servers , but exist at your nameservers) osi3.gua.net. at osi2.gua.net. [205.161.188.3] | |
| fail | Missing nameservers 2 | ERROR: missing nameservers (nameservers what exist at root servers , but does not exist at your nameservers) osi.gua.net. missing at osi2.gua.net. [205.161.188.3] | |
| pass | Nameservers on separate class C's | Your nameservers seems to be in different networks. | |
| pass | All NS IPs public | OK. All of your NS records appear to use public IPs. If there were any private IPs, they would not be reachable, causing DNS delays. | |
| SOA | info | SOA record | Your SOA record is: At osi2.gua.net.[205.161.188.3] Primary nameserver: osi2.gua.net. Hostmaster E-mail address: postmaster.gua.net. Serial #: 2012111603 Refresh: 10800 Retry: 3600 Expire: 3600000 Default TTL:86400 At osi.gua.net.[205.161.188.2] Primary nameserver: Hostmaster E-mail address: Serial #: Refresh: Retry: Expire: Default TTL: |
| fail | NS agreement on SOA Serial # | ERROR: some nameservers have different soa serial number, that can occur because recent master update (slave have not loaded master zone yet) or probably the is a problem in DNS. | |
| pass | SOA MNAME Check | OK. Your SOA (Start of Authority) record states that your master (primary) name server is: osi2.gua.net. That server is listed at the parent servers, which is correct. | |
| pass | SOA Serial Number | OK. Your SOA serial number is: 2012111603. This appears to be in the recommended format of YYYYMMDDnn, where 'nn' is the revision. This number must be incremented every time you make a DNS change. | |
| pass | SOA REFRESH value | Your SOA REFRESH interval is : 10800 seconds. This seems normal (about 3600-7200 seconds is good if not using DNS NOTIFY; RFC1912 2.2 recommends a value between 1200 to 43200 seconds (20 minutes to 12 hours)). This value determines how often secondary/slave nameservers check with the master for updates. | |
| pass | SOA RETRY value | Your SOA RETRY interval is : 3600 seconds. This seems normal (about 120-7200 seconds is good). The retry value is the amount of time your secondary/slave nameservers will wait to contact the master nameserver again if the last attempt failed. | |
| pass | SOA EXPIRE value | Your SOA EXPIRE time is : 3600000 seconds. This seems normal (about 1209600 to 2419200 seconds (2-4 weeks) is good). RFC1912 suggests 2-4 weeks. This is how long a secondary/slave nameserver will wait before considering its DNS data stale if it can't reach the primary nameserver. | |
| pass | SOA MINIMUM TTL value | Your SOA MINIMUM TTL is : 86400 seconds. This seems normal (about 3,600 to 86400 seconds or 1-24 hours is good). RFC2308 suggests a value of 1-3 hours. This value used to determine the default (technically, minimum) TTL (time-to-live) for DNS entries, but now is used for negative caching. | |