Not always a bash command
Che giorno era 85 giorni fa?
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[root@atropo ~]# io ho fatto unix time di oggi - 7171200 secondi
-bash: io: command not found
[root@atropo ~]# maledetta
Guarda che la prossima volta ti stacco la sessione
[root@atropo ~]# scusami
Cosi' va meglio.
[root@atropo ~]#
...watching DNS logs
[DOMAIN NAMES - IMPLEMENTATION AND SPECIFICATION]
4.1.1. Header section format
The header contains the following fields:
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RCODE Response code - this 4 bit field is set as part of responses. The values have the following interpretation:
0 No error condition
1 Format error - The name server was unable to interpret the query.
2 Server failure - The name server was unable to process this query due to a problem with the name server.
3 Name Error - Meaningful only for responses from an authoritative name server, this code signifies that the domain name referenced in the query does not exist.
4 Not Implemented - The name server does not support the requested kind of query.
5 Refused - The name server refuses to perform the specified operation for policy reasons. For example, a name server may not wish to provide the information to the particular requester, or a name server may not wish to perform a particular operation (e.g., zone transfer) for particular data.
6-15 Reserved for future use.
[...]
Tratto da: http://tools.ietf.org/html/rfc1035
Si ringrazia:
tcpdump -s1514 -nX 'udp and port 53 and (udp[10] & 128 = 128) and (udp[11] & 3 = 3)'
"captures DNS responses (QR bit set) with an RCODE of 3 (no such name)."
Tratto da: http://isc.sans.org/diary.html?storyid=4831
