Difference between revisions of "Testing the DNS Name Resolution"
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− | + | <noinclude> | |
+ | = Introduction = | ||
+ | </noinclude> | ||
+ | |||
+ | To verify that your DNS settings are correct and your client or server is able to resolve IP addresses and host names use the <code>nslookup</code> command. The command is available on Linux and Windows. | ||
+ | |||
+ | |||
+ | |||
+ | |||
+ | |||
+ | == Forward Lookup == | ||
+ | |||
+ | To resolve a host name its IP address: | ||
# nslookup DC1.samdom.example.com | # nslookup DC1.samdom.example.com | ||
− | Server: | + | Server: 10.99.0.1 |
− | Address: | + | Address: 10.99.0.1#53 |
Name: DC1.samdom.example.com | Name: DC1.samdom.example.com | ||
− | Address: | + | Address: 10.99.0.1 |
+ | |||
+ | |||
+ | |||
− | |||
− | To | + | == Reverse Lookup == |
+ | |||
+ | To resolve a IP address to its host name: | ||
+ | |||
+ | # nslookup 10.99.0.1 | ||
+ | Server: 10.99.0.1 | ||
+ | Address: 10.99.0.1#53 | ||
+ | |||
+ | 1.0.99.10.in-addr.arpa name = DC1.samdom.example.com. | ||
+ | |||
+ | Note that in a Samba AD, the reverse zone is not automatically configured. To set up a reverse zone, see [[DNS_Administration|DNS Administration]]. | ||
+ | |||
+ | |||
+ | |||
+ | |||
+ | |||
+ | == Resolving SRV Records == | ||
+ | |||
+ | Active Directory (AD) uses SRV records to locate services, such as Kerberos and LDAP. To verify that SRV records are resolved correctly, use the <code>nslookup</code> interactive shell: | ||
# nslookup | # nslookup | ||
− | Default Server: | + | Default Server: 10.99.0.1 |
− | Address: | + | Address: 10.99.0.1 |
> set type=SRV | > set type=SRV | ||
> _ldap._tcp.samdom.example.com. | > _ldap._tcp.samdom.example.com. | ||
Server: UnKnown | Server: UnKnown | ||
− | Address: | + | Address: 10.99.0.1 |
_ldap._tcp.samdom.example.com SRV service location: | _ldap._tcp.samdom.example.com SRV service location: | ||
Line 27: | Line 59: | ||
svr hostname = dc1.samdom.example.com | svr hostname = dc1.samdom.example.com | ||
samdom.example.com nameserver = dc1.samdom.example.com | samdom.example.com nameserver = dc1.samdom.example.com | ||
− | dc1.samdom.example.com internet address = | + | dc1.samdom.example.com internet address = 10.99.0.1 |
− | + | ||
+ | |||
+ | |||
+ | |||
+ | == Error Messages == | ||
+ | |||
+ | * The DNS server is not able to resolve the host name: | ||
** server can't find DC1.samdom.example.com: NXDOMAIN | ** server can't find DC1.samdom.example.com: NXDOMAIN | ||
− | + | * The DNS server is not able to resolve the IP address: | |
+ | |||
+ | ** server can't find 1.0.99.10.in-addr.arpa: NXDOMAIN | ||
+ | |||
+ | * The DNS server used is not available: | ||
;; connection timed out; no servers could be reached | ;; connection timed out; no servers could be reached |
Latest revision as of 10:47, 28 November 2018
Contents
Introduction
To verify that your DNS settings are correct and your client or server is able to resolve IP addresses and host names use the nslookup
command. The command is available on Linux and Windows.
Forward Lookup
To resolve a host name its IP address:
# nslookup DC1.samdom.example.com Server: 10.99.0.1 Address: 10.99.0.1#53 Name: DC1.samdom.example.com Address: 10.99.0.1
Reverse Lookup
To resolve a IP address to its host name:
# nslookup 10.99.0.1 Server: 10.99.0.1 Address: 10.99.0.1#53 1.0.99.10.in-addr.arpa name = DC1.samdom.example.com.
Note that in a Samba AD, the reverse zone is not automatically configured. To set up a reverse zone, see DNS Administration.
Resolving SRV Records
Active Directory (AD) uses SRV records to locate services, such as Kerberos and LDAP. To verify that SRV records are resolved correctly, use the nslookup
interactive shell:
# nslookup Default Server: 10.99.0.1 Address: 10.99.0.1 > set type=SRV > _ldap._tcp.samdom.example.com. Server: UnKnown Address: 10.99.0.1 _ldap._tcp.samdom.example.com SRV service location: priority = 0 weight = 100 port = 389 svr hostname = dc1.samdom.example.com samdom.example.com nameserver = dc1.samdom.example.com dc1.samdom.example.com internet address = 10.99.0.1
Error Messages
- The DNS server is not able to resolve the host name:
** server can't find DC1.samdom.example.com: NXDOMAIN
- The DNS server is not able to resolve the IP address:
** server can't find 1.0.99.10.in-addr.arpa: NXDOMAIN
- The DNS server used is not available:
;; connection timed out; no servers could be reached