Global Services Settings
- Device > Setup > Services
To control and redirect DNS queries between shared and specific
virtual systems, you can use a DNS proxy and a DNS Server profile.
Global Services Settings | Description |
---|---|
Services | |
Update Server | Represents the IP address or host name of
the server from which to download updates from Palo Alto Networks.
The current value is updates.paloaltonetworks.com .
Do not change this setting unless instructed by technical support. |
Verify Update Server Identity | If you enable this option, the firewall
or Panorama will verify that the server from which the software
or content package is download has an SSL certificate signed by
a trusted authority. This adds an additional level of security for
the communication between firewalls or Panorama servers and the update
server. Verify the update server identity
to validate that the server has an SSL certificate signed by a trusted
authority. |
DNS Settings | Choose the type of DNS service— Servers or DNS
Proxy Object —for all DNS queries that the firewall initiates
in support of FQDN address objects, logging, and firewall management.
Options include:
|
Primary DNS Server | Enter the IP address of the primary DNS
server for DNS queries from the firewall. For example, to find the
update server, to resolve DNS entries in logs, or resolve FDQN-based
address objects. |
Secondary DNS Server | ( Optional ) Enter the IP address
of a secondary DNS server to use if the primary server is unavailable. |
Minimum FQDN Refresh Time (sec) | Set a limit on how fast the firewall refreshes
FQDNs that it receives from a DNS. The firewall refreshes an FQDN
based on the TTL of the FQDN as long as the TTL is greater than
or equal to this Minimum FQDN Refresh Time (in
seconds). If the TTL is less than this Minimum FQDN Refresh Time,
the firewall refreshes the FQDN based on this Minimum FQDN Refresh
Time (that is, the firewall does not honor TTLs faster than this setting).
The timer starts when the firewall receives a DNS response from
the DNS server or DNS proxy object resolving the FQDN (range is
0 to 14,400; default is 30). A setting of 0 means the firewall will
refresh the FQDN based on the TTL value in the DNS and does not
enforce a minimum FQDN refresh time.If
the TTL for the FQDN in the DNS is short, but FQDN resolutions don’t
change as frequently as the TTL timeframe so don’t require a faster
refresh, you should set a minimum FQDN Refresh Time to avoid unnecessary
FQDN refresh attempts. |
FQDN Stale Entry Timeout (min) | Specify the length of time (in minutes)
that the firewall continues to use stale FQDN resolutions in the
event of a network failure or unreachable DNS server —when an FQDN
is not getting refreshed (range is 0 to 10,080; default is 1,440).
A value of 0 means the firewall does not continue to use a stale entry.
If the DNS server is still unreachable at the end of the state timeout,
the FQDN entry becomes unresolved (stale resolutions are removed). Make sure the FQDN Stale Entry Timeout value
is short enough to not allow incorrect traffic forwarding (which
poses a security risk), but is long enough to allow traffic continuity
without causing an unplanned network outage. |
Proxy Server section | |
Server | If the firewall needs to use a proxy server
to reach Palo Alto Networks update services, enter the IP address
or host name of the proxy server. |
Port | Enter the port for the proxy server. |
User | Enter the username for the administrator
to enter when accessing the proxy server. |
Password/Confirm Password | Enter and confirm the password for the administrator
to enter when accessing the proxy server. |
NTP | |
NTP Server Address | Enter the IP address or hostname of an NTP
server that you will use to synchronize the clock on the firewall.
Optionally, you can enter the IP address or hostname of a second
NTP server to synchronize the clock on the firewall if the primary
server becomes unavailable. When an
NTP server keeps all network firewall clocks synchronized, scheduled
jobs run as expected and timestamps can help identify the root causes
of issues that involve multiple devices. Configure a primary and
a secondary NTP server in case the primary NTP server becomes unreachable. |
Authentication Type | You can enable the firewall to authenticate
time updates from an NTP server. For each NTP server, select the
type of authentication for the firewall to use:
Enable
NTP server authentication so that the NTP server approves the client
and provides synchronized updates. |
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