; config options server: target-fetch-policy: "0 0 0 0 0" prefetch: "yes" stub-zone: name: "." stub-addr: 193.0.14.129 # K.ROOT-SERVERS.NET. CONFIG_END SCENARIO_BEGIN Test resolver prefetch from child nameserver ; child NS record has longer TTL than A record and is thus valid for prefetch. ; K.ROOT-SERVERS.NET. RANGE_BEGIN 0 100 ADDRESS 193.0.14.129 ENTRY_BEGIN MATCH opcode qtype qname ADJUST copy_id REPLY QR NOERROR SECTION QUESTION . IN NS SECTION ANSWER . IN NS K.ROOT-SERVERS.NET. SECTION ADDITIONAL K.ROOT-SERVERS.NET. IN A 193.0.14.129 ENTRY_END ENTRY_BEGIN MATCH opcode qtype qname ADJUST copy_id REPLY QR NOERROR SECTION QUESTION www.example.com. IN A SECTION AUTHORITY com. IN NS a.gtld-servers.net. SECTION ADDITIONAL a.gtld-servers.net. IN A 192.5.6.30 ENTRY_END RANGE_END ; a.gtld-servers.net. RANGE_BEGIN 0 100 ADDRESS 192.5.6.30 ENTRY_BEGIN MATCH opcode qtype qname ADJUST copy_id REPLY QR NOERROR SECTION QUESTION com. IN NS SECTION ANSWER com. IN NS a.gtld-servers.net. SECTION ADDITIONAL a.gtld-servers.net. IN A 192.5.6.30 ENTRY_END ENTRY_BEGIN MATCH opcode qtype qname ADJUST copy_id REPLY QR NOERROR SECTION QUESTION www.example.com. IN A SECTION AUTHORITY example.com. IN NS ns.example.com. SECTION ADDITIONAL ns.example.com. IN A 1.2.3.4 ENTRY_END RANGE_END ; ns.example.com. RANGE_BEGIN 0 40 ADDRESS 1.2.3.4 ENTRY_BEGIN MATCH opcode qtype qname ADJUST copy_id REPLY QR NOERROR SECTION QUESTION example.com. IN NS SECTION ANSWER example.com. IN NS ns.example.com. SECTION ADDITIONAL ns.example.com. IN A 1.2.3.4 ENTRY_END ENTRY_BEGIN MATCH opcode qtype qname ADJUST copy_id REPLY QR NOERROR SECTION QUESTION www.example.com. IN A SECTION ANSWER www.example.com. 1800 IN A 10.20.30.40 SECTION AUTHORITY example.com. 3600 IN NS ns.example.com. SECTION ADDITIONAL ns.example.com. 3600 IN A 1.2.3.4 ENTRY_END RANGE_END ; ns.example.com. RANGE_BEGIN 50 100 ADDRESS 1.2.3.4 ENTRY_BEGIN MATCH opcode qtype qname ADJUST copy_id REPLY QR NOERROR SECTION QUESTION example.com. IN NS SECTION ANSWER example.com. IN NS ns.example.com. SECTION ADDITIONAL ns.example.com. IN A 1.2.3.4 ENTRY_END ENTRY_BEGIN MATCH opcode qtype qname ADJUST copy_id REPLY QR NOERROR SECTION QUESTION www.example.com. IN A SECTION ANSWER www.example.com. 1800 IN A 10.20.30.40 SECTION AUTHORITY example.com. 3600 IN NS ns.example.com. SECTION ADDITIONAL ns.example.com. 3600 IN A 1.2.3.4 ENTRY_END RANGE_END STEP 1 QUERY ENTRY_BEGIN REPLY RD SECTION QUESTION www.example.com. IN A ENTRY_END ; recursion happens here. STEP 10 CHECK_ANSWER ENTRY_BEGIN MATCH all ttl REPLY QR RD RA NOERROR SECTION QUESTION www.example.com. IN A SECTION ANSWER www.example.com. 1800 IN A 10.20.30.40 SECTION AUTHORITY example.com. 3600 IN NS ns.example.com. SECTION ADDITIONAL ns.example.com. 3600 IN A 1.2.3.4 ENTRY_END ; after 900 secs still the cached answer STEP 20 TIME_PASSES ELAPSE 900 STEP 30 QUERY ENTRY_BEGIN REPLY RD SECTION QUESTION www.example.com. IN A ENTRY_END ; recursion happens here. STEP 40 CHECK_ANSWER ENTRY_BEGIN MATCH all ttl REPLY QR RD RA NOERROR SECTION QUESTION www.example.com. IN A SECTION ANSWER www.example.com. 900 IN A 10.20.30.40 SECTION AUTHORITY example.com. 2700 IN NS ns.example.com. SECTION ADDITIONAL ns.example.com. 2700 IN A 1.2.3.4 ENTRY_END ; after 720 we are 180 seconds before the expiry ; (the authority changes behind the scenes to detect new lookup) STEP 50 TIME_PASSES ELAPSE 720 STEP 60 QUERY ENTRY_BEGIN REPLY RD SECTION QUESTION www.example.com. IN A ENTRY_END ; recursion happens here. STEP 70 CHECK_ANSWER ENTRY_BEGIN MATCH all ttl REPLY QR RD RA NOERROR SECTION QUESTION www.example.com. IN A SECTION ANSWER www.example.com. 180 IN A 10.20.30.40 SECTION AUTHORITY example.com. 1980 IN NS ns.example.com. SECTION ADDITIONAL ns.example.com. 1980 IN A 1.2.3.4 ENTRY_END STEP 80 TRAFFIC ; let traffic flow for prefetch to happen ; above a cache reply with 10% of the original TTL ; but the actual cache is changed, try to get that STEP 120 QUERY ENTRY_BEGIN REPLY RD SECTION QUESTION www.example.com. IN A ENTRY_END ; recursion happens here. STEP 130 CHECK_ANSWER ENTRY_BEGIN MATCH all ttl REPLY QR RD RA NOERROR SECTION QUESTION www.example.com. IN A SECTION ANSWER www.example.com. 1800 IN A 10.20.30.40 SECTION AUTHORITY ; The NS rrset (from the child-side NS) is not updated but keeps counting down example.com. 1980 IN NS ns.example.com. SECTION ADDITIONAL ns.example.com. 1980 IN A 1.2.3.4 ENTRY_END SCENARIO_END