Dns Priority
Test suite to check DNS service priorities
Valid Address
Description
Configures a simple, valid address and checks the DNS can resolve it. There is no priority involved as a single address is in use.
Scenario
Step 1: Set the following configuration in DUT1 :
set interfaces ethernet eth0 address 10.0.0.2/24 set service dns forwarding record host teldat.com ipv4-address 172.24.0.11 set service dns forwarding record host teldat.com ipv6-address 'ff00::dead:cafe' set service dns resolver local set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'
Step 2: Set the following configuration in DUT0 :
set interfaces ethernet eth0 address 10.0.0.1/24 set service dns forwarding logs set service dns forwarding name-server 10.0.0.2 set service dns resolver local set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'
Step 3: Ping IP address 10.0.0.2 from DUT0:
admin@DUT0$ ping 10.0.0.2 count 1 size 56 timeout 1Show output
PING 10.0.0.2 (10.0.0.2) 56(84) bytes of data. 64 bytes from 10.0.0.2: icmp_seq=1 ttl=64 time=0.285 ms --- 10.0.0.2 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.285/0.285/0.285/0.000 ms
Step 4: Run command show host lookup teldat.com type A wait 0 at DUT0 and check if output contains the following tokens:
172.24.0.11Show output
teldat.com has address 172.24.0.11
Step 5: Run command system journal show | cat at DUT0 and expect this output:
Show output
Sep 05 09:39:35.328173 osdx systemd-journald[1764]: Runtime Journal (/run/log/journal/8e652e5518b84f0bb5a60f6ad502329f) is 1.8M, max 13.8M, 11.9M free. Sep 05 09:39:35.330562 osdx systemd-journald[1764]: Received client request to rotate journal, rotating. Sep 05 09:39:35.330615 osdx systemd-journald[1764]: Vacuuming done, freed 0B of archived journals from /run/log/journal/8e652e5518b84f0bb5a60f6ad502329f. Sep 05 09:39:35.337817 osdx OSDxCLI[2038]: User 'admin' executed a new command: 'system journal clear'. Sep 05 09:39:35.553205 osdx OSDxCLI[2038]: User 'admin' executed a new command: 'system coredump delete all'. Sep 05 09:39:36.716843 osdx OSDxCLI[2038]: User 'admin' entered the configuration menu. Sep 05 09:39:36.795679 osdx OSDxCLI[2038]: User 'admin' added a new cfg line: 'set interfaces ethernet eth0 address 10.0.0.1/24'. Sep 05 09:39:36.879298 osdx OSDxCLI[2038]: User 'admin' added a new cfg line: 'set service dns forwarding logs'. Sep 05 09:39:36.934004 osdx OSDxCLI[2038]: User 'admin' added a new cfg line: 'set service dns resolver local'. Sep 05 09:39:37.039684 osdx OSDxCLI[2038]: User 'admin' added a new cfg line: 'set service dns forwarding name-server 10.0.0.2'. Sep 05 09:39:37.109861 osdx OSDxCLI[2038]: User 'admin' added a new cfg line: 'show working'. Sep 05 09:39:37.205195 osdx ubnt-cfgd[7679]: inactive Sep 05 09:39:37.225014 osdx INFO[7687]: FRR daemons did not change Sep 05 09:39:37.410833 osdx systemd[1]: Starting dnsmasq.service - dnsmasq - A lightweight DHCP and caching DNS server... Sep 05 09:39:37.418338 osdx dnsmasq[7827]: started, version 2.90 cachesize 150 Sep 05 09:39:37.418349 osdx dnsmasq[7827]: DNS service limited to local subnets Sep 05 09:39:37.418356 osdx dnsmasq[7827]: compile time options: IPv6 GNU-getopt DBus no-UBus i18n IDN2 DHCP DHCPv6 no-Lua TFTP conntrack ipset nftset auth cryptohash DNSSEC loop-detect inotify dumpfile Sep 05 09:39:37.418364 osdx dnsmasq[7827]: warning: ignoring resolv-file flag because no-resolv is set Sep 05 09:39:37.418382 osdx dnsmasq[7827]: using nameserver 10.0.0.2#53 Sep 05 09:39:37.418420 osdx dnsmasq[7827]: read /etc/hosts - 1 names Sep 05 09:39:37.446908 osdx systemd[1]: Started dnsmasq.service - dnsmasq - A lightweight DHCP and caching DNS server. Sep 05 09:39:37.447696 osdx cfgd[1461]: [2038]Completed change to active configuration Sep 05 09:39:37.462844 osdx OSDxCLI[2038]: User 'admin' committed the configuration. Sep 05 09:39:37.482894 osdx OSDxCLI[2038]: User 'admin' left the configuration menu. Sep 05 09:39:37.625334 osdx OSDxCLI[2038]: User 'admin' executed a new command: 'ping 10.0.0.2 count 1 size 56 timeout 1'. Sep 05 09:39:37.700433 osdx dnsmasq[7827]: query[A] teldat.com from ::1 Sep 05 09:39:37.700491 osdx dnsmasq[7827]: forwarded teldat.com to 10.0.0.2 Sep 05 09:39:37.700788 osdx dnsmasq[7827]: reply teldat.com is 172.24.0.11 Sep 05 09:39:37.712011 osdx OSDxCLI[2038]: User 'admin' executed a new command: 'show host lookup teldat.com type A wait 0'.
Valid Address IPv6
Description
Configures a simple, valid IPv6 address and checks the DNS can resolve it. There is no priority involved as a single address is in use.
Scenario
Step 1: Set the following configuration in DUT1 :
set interfaces ethernet eth0 address '10::2/64' set service dns forwarding record host teldat.com ipv4-address 172.24.0.11 set service dns forwarding record host teldat.com ipv6-address 'ff00::dead:cafe' set service dns resolver local set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'
Step 2: Set the following configuration in DUT0 :
set interfaces ethernet eth0 address '10::1/64' set service dns forwarding logs set service dns forwarding name-server '10::2' set service dns resolver local set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'
Step 3: Ping IP address 10::2 from DUT0:
admin@DUT0$ ping 10::2 count 1 size 56 timeout 1Show output
PING 10::2(10::2) 56 data bytes 64 bytes from 10::2: icmp_seq=1 ttl=64 time=451 ms --- 10::2 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 450.539/450.539/450.539/0.000 ms
Step 4: Run command show host lookup teldat.com type A wait 0 at DUT0 and check if output contains the following tokens:
172.24.0.11Show output
teldat.com has address 172.24.0.11
Step 5: Run command system journal show | cat at DUT0 and expect this output:
Show output
Sep 05 09:39:42.356493 osdx systemd-journald[1764]: Runtime Journal (/run/log/journal/8e652e5518b84f0bb5a60f6ad502329f) is 1.8M, max 13.8M, 11.9M free. Sep 05 09:39:42.358729 osdx systemd-journald[1764]: Received client request to rotate journal, rotating. Sep 05 09:39:42.358792 osdx systemd-journald[1764]: Vacuuming done, freed 0B of archived journals from /run/log/journal/8e652e5518b84f0bb5a60f6ad502329f. Sep 05 09:39:42.367380 osdx OSDxCLI[2038]: User 'admin' executed a new command: 'system journal clear'. Sep 05 09:39:42.582997 osdx OSDxCLI[2038]: User 'admin' executed a new command: 'system coredump delete all'. Sep 05 09:39:43.860291 osdx OSDxCLI[2038]: User 'admin' entered the configuration menu. Sep 05 09:39:43.964174 osdx OSDxCLI[2038]: User 'admin' added a new cfg line: 'set interfaces ethernet eth0 address 10::1/64'. Sep 05 09:39:44.018578 osdx OSDxCLI[2038]: User 'admin' added a new cfg line: 'set service dns forwarding logs'. Sep 05 09:39:44.104785 osdx OSDxCLI[2038]: User 'admin' added a new cfg line: 'set service dns resolver local'. Sep 05 09:39:44.165207 osdx OSDxCLI[2038]: User 'admin' added a new cfg line: 'set service dns forwarding name-server 10::2'. Sep 05 09:39:44.278843 osdx OSDxCLI[2038]: User 'admin' added a new cfg line: 'show working'. Sep 05 09:39:44.340123 osdx ubnt-cfgd[8159]: inactive Sep 05 09:39:44.359668 osdx INFO[8167]: FRR daemons did not change Sep 05 09:39:44.531004 osdx systemd[1]: Starting dnsmasq.service - dnsmasq - A lightweight DHCP and caching DNS server... Sep 05 09:39:44.538681 osdx dnsmasq[8310]: started, version 2.90 cachesize 150 Sep 05 09:39:44.538875 osdx dnsmasq[8310]: DNS service limited to local subnets Sep 05 09:39:44.538911 osdx dnsmasq[8310]: compile time options: IPv6 GNU-getopt DBus no-UBus i18n IDN2 DHCP DHCPv6 no-Lua TFTP conntrack ipset nftset auth cryptohash DNSSEC loop-detect inotify dumpfile Sep 05 09:39:44.538939 osdx dnsmasq[8310]: warning: ignoring resolv-file flag because no-resolv is set Sep 05 09:39:44.538979 osdx dnsmasq[8310]: using nameserver 10::2#53 Sep 05 09:39:44.539043 osdx dnsmasq[8310]: read /etc/hosts - 1 names Sep 05 09:39:44.569032 osdx systemd[1]: Started dnsmasq.service - dnsmasq - A lightweight DHCP and caching DNS server. Sep 05 09:39:44.569822 osdx cfgd[1461]: [2038]Completed change to active configuration Sep 05 09:39:44.583515 osdx OSDxCLI[2038]: User 'admin' committed the configuration. Sep 05 09:39:44.611834 osdx OSDxCLI[2038]: User 'admin' left the configuration menu. Sep 05 09:39:45.761703 osdx OSDxCLI[2038]: User 'admin' executed a new command: 'ping 10::2 count 1 size 56 timeout 1'. Sep 05 09:39:46.804358 osdx OSDxCLI[2038]: User 'admin' executed a new command: 'ping 10::2 count 1 size 56 timeout 1'. Sep 05 09:39:46.892026 osdx dnsmasq[8310]: query[A] teldat.com from ::1 Sep 05 09:39:46.892091 osdx dnsmasq[8310]: forwarded teldat.com to 10::2 Sep 05 09:39:46.892474 osdx dnsmasq[8310]: reply teldat.com is 172.24.0.11 Sep 05 09:39:46.904046 osdx OSDxCLI[2038]: User 'admin' executed a new command: 'show host lookup teldat.com type A wait 0'.
Multiple Addresses
Description
Configures two DNS addresses: one invalid and the other valid. Checks that the resolution works against the second address, while the first one does not respond.
Scenario
Step 1: Set the following configuration in DUT1 :
set interfaces ethernet eth0 address 10.0.0.2/24 set service dns forwarding record host teldat.com ipv4-address 172.24.0.11 set service dns forwarding record host teldat.com ipv6-address 'ff00::dead:cafe' set service dns resolver local set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'
Step 2: Set the following configuration in DUT0 :
set interfaces ethernet eth0 address 10.0.0.1/24 set service dns forwarding logs set service dns forwarding name-server 10.0.0.10 priority 0 set service dns forwarding name-server 10.0.0.2 priority 1 set service dns resolver local set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'
Step 3: Ping IP address 10.0.0.2 from DUT0:
admin@DUT0$ ping 10.0.0.2 count 1 size 56 timeout 1Show output
PING 10.0.0.2 (10.0.0.2) 56(84) bytes of data. 64 bytes from 10.0.0.2: icmp_seq=1 ttl=64 time=0.354 ms --- 10.0.0.2 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.354/0.354/0.354/0.000 ms
Step 4: Run command show host lookup teldat.com type A wait 0 at DUT0 and check if output contains the following tokens:
172.24.0.11Show output
;; communications error to ::1#53: timed out ;; communications error to ::1#53: timed out teldat.com has address 172.24.0.11
Step 5: Run command system journal show | cat at DUT0 and expect this output:
Show output
Sep 05 09:39:51.302783 osdx systemd-journald[1764]: Runtime Journal (/run/log/journal/8e652e5518b84f0bb5a60f6ad502329f) is 1.8M, max 13.8M, 11.9M free. Sep 05 09:39:51.306739 osdx systemd-journald[1764]: Received client request to rotate journal, rotating. Sep 05 09:39:51.306795 osdx systemd-journald[1764]: Vacuuming done, freed 0B of archived journals from /run/log/journal/8e652e5518b84f0bb5a60f6ad502329f. Sep 05 09:39:51.314251 osdx OSDxCLI[2038]: User 'admin' executed a new command: 'system journal clear'. Sep 05 09:39:51.520346 osdx OSDxCLI[2038]: User 'admin' executed a new command: 'system coredump delete all'. Sep 05 09:39:52.721286 osdx OSDxCLI[2038]: User 'admin' entered the configuration menu. Sep 05 09:39:52.803088 osdx OSDxCLI[2038]: User 'admin' added a new cfg line: 'set interfaces ethernet eth0 address 10.0.0.1/24'. Sep 05 09:39:52.885753 osdx OSDxCLI[2038]: User 'admin' added a new cfg line: 'set service dns forwarding logs'. Sep 05 09:39:52.951623 osdx OSDxCLI[2038]: User 'admin' added a new cfg line: 'set service dns resolver local'. Sep 05 09:39:53.053235 osdx OSDxCLI[2038]: User 'admin' added a new cfg line: 'set service dns forwarding name-server 10.0.0.10 priority 0'. Sep 05 09:39:53.108769 osdx OSDxCLI[2038]: User 'admin' added a new cfg line: 'set service dns forwarding name-server 10.0.0.2 priority 1'. Sep 05 09:39:53.223203 osdx OSDxCLI[2038]: User 'admin' added a new cfg line: 'show working'. Sep 05 09:39:53.285699 osdx ubnt-cfgd[8649]: inactive Sep 05 09:39:53.305715 osdx INFO[8657]: FRR daemons did not change Sep 05 09:39:53.474997 osdx systemd[1]: Starting dnsmasq.service - dnsmasq - A lightweight DHCP and caching DNS server... Sep 05 09:39:53.484597 osdx dnsmasq[8800]: started, version 2.90 cachesize 150 Sep 05 09:39:53.484610 osdx dnsmasq[8800]: DNS service limited to local subnets Sep 05 09:39:53.484617 osdx dnsmasq[8800]: compile time options: IPv6 GNU-getopt DBus no-UBus i18n IDN2 DHCP DHCPv6 no-Lua TFTP conntrack ipset nftset auth cryptohash DNSSEC loop-detect inotify dumpfile Sep 05 09:39:53.484626 osdx dnsmasq[8800]: warning: ignoring resolv-file flag because no-resolv is set Sep 05 09:39:53.484648 osdx dnsmasq[8800]: using nameserver 10.0.0.10#53 Sep 05 09:39:53.484654 osdx dnsmasq[8800]: using nameserver 10.0.0.2#53 Sep 05 09:39:53.484696 osdx dnsmasq[8800]: read /etc/hosts - 1 names Sep 05 09:39:53.515156 osdx systemd[1]: Started dnsmasq.service - dnsmasq - A lightweight DHCP and caching DNS server. Sep 05 09:39:53.516053 osdx cfgd[1461]: [2038]Completed change to active configuration Sep 05 09:39:53.527335 osdx OSDxCLI[2038]: User 'admin' committed the configuration. Sep 05 09:39:53.553572 osdx OSDxCLI[2038]: User 'admin' left the configuration menu. Sep 05 09:39:53.719458 osdx OSDxCLI[2038]: User 'admin' executed a new command: 'ping 10.0.0.2 count 1 size 56 timeout 1'. Sep 05 09:39:53.837370 osdx dnsmasq[8800]: query[A] teldat.com from ::1 Sep 05 09:39:53.837448 osdx dnsmasq[8800]: forwarded teldat.com to 10.0.0.10 Sep 05 09:39:54.838719 osdx dnsmasq[8800]: query[A] teldat.com from ::1 Sep 05 09:39:55.839767 osdx dnsmasq[8800]: query[A] teldat.com from 127.0.0.1 Sep 05 09:39:55.839820 osdx dnsmasq[8800]: forwarded teldat.com to 10.0.0.2 Sep 05 09:39:55.840181 osdx dnsmasq[8800]: reply teldat.com is 172.24.0.11 Sep 05 09:39:55.851981 osdx OSDxCLI[2038]: User 'admin' executed a new command: 'show host lookup teldat.com type A wait 0'.
Multiple IPv6 Addresses
Description
Configures two IPv6 DNS addresses: one invalid and the other valid. Checks that the resolution works against the second address, while the first one does not respond.
Scenario
Step 1: Set the following configuration in DUT1 :
set interfaces ethernet eth0 address '10::2/64' set service dns forwarding record host teldat.com ipv4-address 172.24.0.11 set service dns forwarding record host teldat.com ipv6-address 'ff00::dead:cafe' set service dns resolver local set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'
Step 2: Set the following configuration in DUT0 :
set interfaces ethernet eth0 address '10::1/64' set service dns forwarding logs set service dns forwarding name-server '10::10' priority 0 set service dns forwarding name-server '10::2' priority 1 set service dns resolver local set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'
Step 3: Ping IP address 10::2 from DUT0:
admin@DUT0$ ping 10::2 count 1 size 56 timeout 1Show output
PING 10::2(10::2) 56 data bytes 64 bytes from 10::2: icmp_seq=1 ttl=64 time=468 ms --- 10::2 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 468.242/468.242/468.242/0.000 ms
Step 4: Run command show host lookup teldat.com type A wait 0 at DUT0 and check if output contains the following tokens:
172.24.0.11Show output
;; communications error to ::1#53: timed out ;; communications error to ::1#53: timed out teldat.com has address 172.24.0.11
Step 5: Run command system journal show | cat at DUT0 and expect this output:
Show output
Sep 05 09:40:00.307137 osdx systemd-journald[1764]: Runtime Journal (/run/log/journal/8e652e5518b84f0bb5a60f6ad502329f) is 1.8M, max 13.8M, 11.9M free. Sep 05 09:40:00.309426 osdx systemd-journald[1764]: Received client request to rotate journal, rotating. Sep 05 09:40:00.309485 osdx systemd-journald[1764]: Vacuuming done, freed 0B of archived journals from /run/log/journal/8e652e5518b84f0bb5a60f6ad502329f. Sep 05 09:40:00.316730 osdx OSDxCLI[2038]: User 'admin' executed a new command: 'system journal clear'. Sep 05 09:40:00.545072 osdx OSDxCLI[2038]: User 'admin' executed a new command: 'system coredump delete all'. Sep 05 09:40:01.863760 osdx OSDxCLI[2038]: User 'admin' entered the configuration menu. Sep 05 09:40:01.946068 osdx OSDxCLI[2038]: User 'admin' added a new cfg line: 'set interfaces ethernet eth0 address 10::1/64'. Sep 05 09:40:02.026287 osdx OSDxCLI[2038]: User 'admin' added a new cfg line: 'set service dns forwarding logs'. Sep 05 09:40:02.123300 osdx OSDxCLI[2038]: User 'admin' added a new cfg line: 'set service dns resolver local'. Sep 05 09:40:02.213526 osdx OSDxCLI[2038]: User 'admin' added a new cfg line: 'set service dns forwarding name-server 10::10 priority 0'. Sep 05 09:40:02.269822 osdx OSDxCLI[2038]: User 'admin' added a new cfg line: 'set service dns forwarding name-server 10::2 priority 1'. Sep 05 09:40:02.380507 osdx OSDxCLI[2038]: User 'admin' added a new cfg line: 'show working'. Sep 05 09:40:02.443547 osdx ubnt-cfgd[9139]: inactive Sep 05 09:40:02.466477 osdx INFO[9147]: FRR daemons did not change Sep 05 09:40:02.637740 osdx systemd[1]: Starting dnsmasq.service - dnsmasq - A lightweight DHCP and caching DNS server... Sep 05 09:40:02.645833 osdx dnsmasq[9290]: started, version 2.90 cachesize 150 Sep 05 09:40:02.646005 osdx dnsmasq[9290]: DNS service limited to local subnets Sep 05 09:40:02.646038 osdx dnsmasq[9290]: compile time options: IPv6 GNU-getopt DBus no-UBus i18n IDN2 DHCP DHCPv6 no-Lua TFTP conntrack ipset nftset auth cryptohash DNSSEC loop-detect inotify dumpfile Sep 05 09:40:02.646068 osdx dnsmasq[9290]: warning: ignoring resolv-file flag because no-resolv is set Sep 05 09:40:02.646107 osdx dnsmasq[9290]: using nameserver 10::10#53 Sep 05 09:40:02.646138 osdx dnsmasq[9290]: using nameserver 10::2#53 Sep 05 09:40:02.646193 osdx dnsmasq[9290]: read /etc/hosts - 1 names Sep 05 09:40:02.676610 osdx systemd[1]: Started dnsmasq.service - dnsmasq - A lightweight DHCP and caching DNS server. Sep 05 09:40:02.677780 osdx cfgd[1461]: [2038]Completed change to active configuration Sep 05 09:40:02.692084 osdx OSDxCLI[2038]: User 'admin' committed the configuration. Sep 05 09:40:02.711304 osdx OSDxCLI[2038]: User 'admin' left the configuration menu. Sep 05 09:40:03.855664 osdx OSDxCLI[2038]: User 'admin' executed a new command: 'ping 10::2 count 1 size 56 timeout 1'. Sep 05 09:40:04.899436 osdx OSDxCLI[2038]: User 'admin' executed a new command: 'ping 10::2 count 1 size 56 timeout 1'. Sep 05 09:40:04.975008 osdx dnsmasq[9290]: query[A] teldat.com from ::1 Sep 05 09:40:04.975061 osdx dnsmasq[9290]: forwarded teldat.com to 10::10 Sep 05 09:40:05.976080 osdx dnsmasq[9290]: query[A] teldat.com from ::1 Sep 05 09:40:06.977028 osdx dnsmasq[9290]: query[A] teldat.com from 127.0.0.1 Sep 05 09:40:06.977066 osdx dnsmasq[9290]: forwarded teldat.com to 10::2 Sep 05 09:40:06.977379 osdx dnsmasq[9290]: reply teldat.com is 172.24.0.11 Sep 05 09:40:06.978874 osdx OSDxCLI[2038]: User 'admin' executed a new command: 'show host lookup teldat.com type A wait 0'.