; config options server: module-config: "validator iterator" qname-minimisation: "no" minimal-responses: no serve-expired: yes log-servfail: yes ede: yes ede-serve-expired: yes stub-zone: name: "example.com" stub-addr: 1.2.3.4 CONFIG_END SCENARIO_BEGIN Test serve-expired with SERVFAIL followed by 0 TTL ; Scenario overview: ; - query for 0ttl.example.com. IN A ; - answer from upstream is SERVFAIL; will be cached for NORR_TTL(5) ; - check that the client gets the SERVFAIL; also cached ; - query again right after the TTL expired ; - this time the server answers with a 0 TTL RRset ; - check that we get the correct answer ; ns.example.com. RANGE_BEGIN 0 20 ADDRESS 1.2.3.4 ; response to A query ENTRY_BEGIN MATCH opcode qtype qname ADJUST copy_id REPLY QR AA SERVFAIL SECTION QUESTION 0ttl.example.com. IN A ENTRY_END RANGE_END ; ns.example.com. RANGE_BEGIN 30 100 ADDRESS 1.2.3.4 ENTRY_BEGIN MATCH opcode qtype qname ADJUST copy_id REPLY QR NOERROR SECTION QUESTION example.com. 10 IN NS SECTION ANSWER example.com. 10 IN NS ns.example.com. SECTION ADDITIONAL ns.example.com. 10 IN A 1.2.3.4 ENTRY_END ENTRY_BEGIN MATCH opcode qtype qname ADJUST copy_id REPLY QR NOERROR SECTION QUESTION 0ttl.example.com. IN A SECTION ANSWER 0ttl.example.com. 0 IN A 5.6.7.8 SECTION AUTHORITY example.com. 10 IN NS ns.example.com. SECTION ADDITIONAL ns.example.com. 10 IN A 1.2.3.4 ENTRY_END RANGE_END ; Query with RD flag STEP 0 QUERY ENTRY_BEGIN REPLY RD SECTION QUESTION 0ttl.example.com. IN A ENTRY_END ; Check that we get the SERVFAIL (will be cached) STEP 10 CHECK_ANSWER ENTRY_BEGIN MATCH all REPLY QR RD RA SERVFAIL SECTION QUESTION 0ttl.example.com. IN A ENTRY_END ; Query again STEP 20 QUERY ENTRY_BEGIN REPLY RD SECTION QUESTION 0ttl.example.com. IN A ENTRY_END ; Check that we get the cached SERVFAIL STEP 30 CHECK_ANSWER ENTRY_BEGIN MATCH all REPLY QR RD RA SERVFAIL SECTION QUESTION 0ttl.example.com. IN A ENTRY_END ; Wait for the SERVFAIL to expire STEP 31 TIME_PASSES ELAPSE 32 ; Query again STEP 40 QUERY ENTRY_BEGIN REPLY RD SECTION QUESTION 0ttl.example.com. IN A ENTRY_END ; Check that we got the correct answer STEP 50 CHECK_ANSWER ENTRY_BEGIN MATCH all ttl REPLY QR RD RA NOERROR SECTION QUESTION 0ttl.example.com. IN A SECTION ANSWER 0ttl.example.com. 0 IN A 5.6.7.8 SECTION AUTHORITY example.com. 10 IN NS ns.example.com. SECTION ADDITIONAL ns.example.com. 10 IN A 1.2.3.4 ENTRY_END SCENARIO_END