Technical References

163
Cisco AsyncOS 9.1 for Email CLI Reference Guide
Chapter 3 The Commands: Reference Examples
Networking Configuration / Network Tools
nslookup
Description
Use the nslookup command to check the DNS functionality.
The
nslookup command can confirm that the appliance is able to reach and resolve hostnames and IP
addresses from a working DNS (domain name service) server.
Usage
Commit: This command does not require a ‘commit’.
Cluster Management: This command can be used in all three machine modes (cluster, group, machine).
Batch Command: This command does not support a batch format
Example
mail.example.com> nslookup
Please enter the host or IP address to resolve.
[]> vm30esa0086.ibqa
Choose the query type:
1. A the host's IP address
2. AAAA the host's IPv6 address
3. CNAME the canonical name for an alias
4. MX the mail exchanger
5. NS the name server for the named zone
6. PTR the hostname if the query is an Internet address,
otherwise the pointer to other information
7. SOA the domain's "start-of-authority" information
8. TXT the text information
[1]> 2
AAAA=2001:420:54ff:ff06::95 TTL=30m
Ta b l e 3 - 11 nslookup Command Query Types
Query Type Description
A the host's Internet address
CNAME the canonical name for an alias
MX the mail exchanger
NS the name server for the named zone
PTR the hostname if the query is an Internet address, otherwise the pointer
to other information
SOA the domain's “start-of-authority” information
TXT the text information