Linux/DNS: Difference between revisions
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== host == | == Ubuntu 18.04 show DNS settings == | ||
<pre> | |||
systemd-resolve --status | |||
</pre> | |||
== host (scripting) == | |||
== dig (testing) == | |||
* install | |||
<pre>apt install dnsutils</pre> | |||
* Basic query | |||
<pre>dig google.com</pre> | |||
* Query all record types | |||
<pre>dig google.com ANY</pre> | |||
* Query specific DNS server | |||
<pre>dig google.de @8.8.8.8</pre> | |||
* Reverse DNS lookup | |||
<pre>dig -x 193.99.144.80</pre> | |||
* Trace DNS path | |||
<pre>dig google.com +trace</pre> | |||
== nslookup == | == nslookup == | ||
<pre> | |||
nslookup google.com | |||
nslookup -query=ANY google.com | |||
</pre> | |||
== DNS entry == | |||
<pre> | |||
$TTL 86400 | |||
@ IN SOA ns1.first-ns.de. postmaster.robot.first-ns.de. ( | |||
2000091604 ; Serial | |||
14400 ; Refresh | |||
1800 ; Retry | |||
604800 ; Expire | |||
86400 ) ; Minimum | |||
@ IN NS ns1.first-ns.de. | |||
@ IN NS robotns2.second-ns.de. | |||
@ IN NS robotns3.second-ns.com. | |||
localhost IN A 127.0.0.1 | |||
@ IN A 1.2.3.4 | |||
www IN A 2.3.4.5 | |||
www IN AAAA 2001:db8::1 | |||
mail IN A 2.3.4.5 | |||
loopback IN CNAME localhost | |||
pop IN CNAME www | |||
smtp IN CNAME www | |||
relay IN CNAME www | |||
imap IN CNAME www | |||
ftp 3600 IN CNAME ftp.anderedomain.de. | |||
@ IN MX 10 mail | |||
technik IN A 5.6.7.8 | |||
technik IN MX 10 technik | |||
@ IN TXT "v=spf1 mx -all" | |||
</pre> | |||
== DNS entry types == | |||
* ANY (all types) | |||
* A (Host address) | |||
* AAAA (IPv6 host address) | |||
* ALIAS (Auto resolved alias) | |||
* CNAME (Canonical name for an alias) | |||
* MX (Mail eXchange) | |||
* NS (Name Server) | |||
* PTR (Pointer) | |||
* SOA (Start Of Authority) | |||
** | |||
<blockquote> | |||
<pre> | |||
$TTL 86400 | |||
@ IN SOA ns1.first-ns.de. postmaster.robot.first-ns.de. ( | |||
2000091604 ; Serial | |||
14400 ; Refresh | |||
1800 ; Retry | |||
604800 ; Expire | |||
86400 ) ; Minimum | |||
</pre> | |||
</blockquote> | |||
* SRV (location of service) | |||
* TXT (Descriptive text) | |||
Latest revision as of 11:29, 19 August 2019
Ubuntu 18.04 show DNS settings
systemd-resolve --status
host (scripting)
dig (testing)
- install
apt install dnsutils
- Basic query
dig google.com
- Query all record types
dig google.com ANY
- Query specific DNS server
dig google.de @8.8.8.8
- Reverse DNS lookup
dig -x 193.99.144.80
- Trace DNS path
dig google.com +trace
nslookup
nslookup google.com nslookup -query=ANY google.com
DNS entry
$TTL 86400
@ IN SOA ns1.first-ns.de. postmaster.robot.first-ns.de. (
2000091604 ; Serial
14400 ; Refresh
1800 ; Retry
604800 ; Expire
86400 ) ; Minimum
@ IN NS ns1.first-ns.de.
@ IN NS robotns2.second-ns.de.
@ IN NS robotns3.second-ns.com.
localhost IN A 127.0.0.1
@ IN A 1.2.3.4
www IN A 2.3.4.5
www IN AAAA 2001:db8::1
mail IN A 2.3.4.5
loopback IN CNAME localhost
pop IN CNAME www
smtp IN CNAME www
relay IN CNAME www
imap IN CNAME www
ftp 3600 IN CNAME ftp.anderedomain.de.
@ IN MX 10 mail
technik IN A 5.6.7.8
technik IN MX 10 technik
@ IN TXT "v=spf1 mx -all"
DNS entry types
- ANY (all types)
- A (Host address)
- AAAA (IPv6 host address)
- ALIAS (Auto resolved alias)
- CNAME (Canonical name for an alias)
- MX (Mail eXchange)
- NS (Name Server)
- PTR (Pointer)
- SOA (Start Of Authority)
$TTL 86400 @ IN SOA ns1.first-ns.de. postmaster.robot.first-ns.de. ( 2000091604 ; Serial 14400 ; Refresh 1800 ; Retry 604800 ; Expire 86400 ) ; Minimum
- SRV (location of service)
- TXT (Descriptive text)