NAME

        CL_RFC2308_5_expire_cache_NXDOMAIN - TTL expired negative cache MUST NOT be used (NXDOMAIN)


VERIFICATION POINTS

        Verify that a NUT does not use the TTL expired negative cache.


TARGET

        Client (with Caching function)


SYNOPSIS

	CL_RFC2308_5_expire_cache_NXDOMAIN.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=invalid.example.com | | | |<---------------------------------------------| | 2. Standard query response | | NXDOMAIN | | TTL=15 seconds | | | // wait 15 seconds // | | |--------------------------------------------->| | 3. Send standard query | | QNAME=invalid.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=invalid.example.com from NUT.
        3. Received standard query QNAME=invalid.example.com from NUT.


TERMINATION

        If NUT has cache function, clear the cache.


REFERENCE

	RFC2308 Negative Caching of DNS Queries (DNS NCACHE)
	5 - Caching Negative Answers