NAME

        CL_RFC1034_3_6_Zero_TTL - Zero TTL prohibits caching


VERIFICATION POINTS

        Verify that a NUT prohibits caching with zero TTL


TARGET

        Client (with Caching function)


SYNOPSIS

	CL_RFC1034_3_6_Zero_TTL.seq [-tooloption ...]: KOI tool option
	See also DNSConfig.pm


INITIALIZATION


TEST PROCEDURE

	This test sequence is following.

DNS Client1 (NUT) DNS Server1 (TN) | | |--------------------------------------------->| | 1. Send standard query | | QNAME=A.example.com | | | |<---------------------------------------------| | 2. Standard query response | | TTL=0 | | | |--------------------------------------------->| | 3. Send standard query | | QNAME=A.example.com | v v
1. NUT send standard query to TN. Judgment (Check *1) 2. TN send standard query response to NUT. 3. NUT send standard query to TN. Judgment (Check *3)


JUDGMENT

        1. Received standard query QNAME=A.example.com from NUT.
        3. Received standard query QNAME=A.example.com from NUT.


TERMINATION

        If NUT has cache function, clear the cache.


REFERENCE

	RFC1034 DOMAIN NAMES - CONCEPTS AND FACILITIES
	3.6. Resource Records

RFC1123 Requirements for Internet Hosts -- Application and Support 6.1.2.1 Resource Records with Zero TTL: RFC-1035 Section 3.2.1