Questions on Palo Alto safe practices

Not applicable

Questions on Palo Alto safe practices

Hi i have a few outstanding questions on Palo Alto devices. We just migrated from Juniper to PA line. So these might sound silly for people who already are on PA line.

  1. Do we have any primary and back up images on PA firewall . Just like in JUNOS if one image is corrupt it tries to load from the back up image file.
  2. How many rollbacks does the PA device support by default ? Can we actually delete some of them if we don't wish to have them on the device?
  3. How do we load factory default configuration on the device ? What does the factory default config contain ? Does it have some templates?
  4. What are the safe practices in operating a device ? Powering off and on PA firewall do we have some CLI commands ? I think we have a restart option in WEB GUI . But wanted to know about halting and forceful power off.
  5. How do we clean up the database once it is full ? Can we delete the logs like system logs and all?
  6. Flow diagram keeps changing in all of the modules (eg NAT ) . If you can throw some light on that , it would be helpful.
  7. Can we apply import policies for route redistribution? The reason why i ask this is i did not find any import for RIP , OSPF except for BGP.
  8. When we are configuring DNAT, what should we match on the destination IP address ( the pre NAT IP ) and i check mark on translated packet and give my post nat ip ? But i could not implement that on my device for some reason. Same goes with Static NAT
  9. When doing lab on Route redistribution , i matched on my default route and tried to redistribute that in OSPF but for some reason everything was visible except my default route which i exported in OSPF.

Hoping to get answers for these .. Thanks a lot guys !!

L4 Transporter

Re: Questions on Palo Alto safe practices

Hi Srikanth,

For Palo alto firewall, you can always re-install a software image. This can be achieved by going to Device > Software > and clicking the

As far as the partitions are concerned on the device, there are 2 partitions, running and revertible. Revertible would be the last version of OS installed on to the device.

>debug swm status


The revertible version is available if fallback is needed . With the next PAN-OS upgrade the revertible version will be replaced with the current running-active version. You will then be able to delete 4.0.1.

To boot from the partition in use prior to the upgrade, issue the command

>debug swm revert

Factory default configurations will have only management ip-addresses set to and the default admin password.

For sample configurations please have a look at the following links to see if it useful to you,

At this time we don not have a CLI command to power off the device but we can restart the system

>request restart system

Force ful power off will be removing the power cable from the device.

You can delete the system traffic threat logs using the following commnads:-

To remove these logs, use the following CLI command:

clear log <log name>

where log name is:


Let me know if this is helpful.



L4 Transporter

Re: Questions on Palo Alto safe practices


Flow diagram for a packet when it ingress the firewall is explained beautifully in this document:-

Also here is the link to the redistribution of routes from one area to the other using the firewall.

Document is also attached to the thread.

Here is the sample config snapshot of the DNAT rule


Make sure you also have a security rule to allow traffic from untrust to trust zone.

Link to NAT document :

Advertising a default route via OSPF. Is this what you were looking for?

Let me know of it is helpful.



L6 Presenter

Re: Questions on Palo Alto safe practices

1. See ppatel answer. You have a revertable image and you can also load other images aswell (the later will take a few minutes to complete since it will re-install the image you like).

2. I think that depends on the model and how large the drives are. I prefer to delete stuff I no longer have use for and keep only the previous (and perhaps the version before that) still on the box. You can always download the images again if needed (keeping the old images is just to not to have to wait for the download to complete in case one need to rollback).

3. You can use the maint-mode to reset the device into factory settings (the current image will be used but all settings and logs will be wiped).

4. I think its safe to use a PA box just like any other networkconnected device. The main difference (depending on which models of Juniper you used previously) is that the PA have a dedicated mgmtplane running linux. So if you just unplug the powercoard it might take a few more seconds to boot up next time due to harddrive checks. Compared to Juniper the PA main configuration method is to use the WEB rather than CLI as GUI.

5. The logs are like a cyclic buffer so oldest entries will be overwritten by default. If you need to store the logs for a longer time of period you can get a Panorama log-only installation which your PA devices will push their logs to. You can also use plain syslog to archive the logs. Also CEF is supported in case you run Arcsight.

6. Except for what ppatel already said the guideline when setting up security policies in a PA for NAT-use is:

srczone: <prenat srczone>

dstzone: <postnat dstzone>

dstip: <prenat dstip>

7. Sorry I havent done dynamic routing with PA so I dont know.

8. See 6 above.

9. See 7 above.

Bonus: If you havent seen these docs before these 2-3 docs are great in order to better learn how a PA can be used:

Designing Networks with Palo Alto Networks Firewalls

Diagrams and Tested Configurations

Threat Prevention Deployment Tech Note

Not applicable

Re: Questions on Palo Alto safe practices

Hi Parth thanks for the useful info

I am using 6 PA 500 devices and 1 PA 2020 device . I assume that this has a storage capacity of 120 gb . But it shows 5.96 gb free and rest is occupied and i am pretty sure that i did not create any logs. How can i free this storage space and make use of the rest of 115 gb on my PA firewalls

Thanks in advance..

L4 Transporter

Re: Questions on Palo Alto safe practices

Hi Srikanth,

Where do you see these ? Is it under Device > Setup > management ?


Once you click edit under these settings, you will see the following:-


This means that 45.76 GB of your total space is allocated to logging and reporting and the rest of it is free.

If you add up the% quotas, it will be 95%. (As an example to the above screenshot)

Please let me know if it is helpful.



Not applicable

Re: Questions on Palo Alto safe practices

Hi Parth,

I could see this under Device > Setup > Management tab the space reserved as 95 percent

But i could not see the other one precisely how much memory is occupied on my firewall currently .

Could you help ?


Not applicable

Re: Questions on Palo Alto safe practices

Hi Mikand thanks for the prompt reply

3. You can use the maint-mode to reset the device into factory settings (the current image will be used but all settings and logs will be wiped).

Except for this one i think i have a clarity on rest of the things.

How do i load the maint mode on PA both from CLI and Web GUI?

L4 Transporter

Re: Questions on Palo Alto safe practices


The following command will help you to see the disk space on the device.

admin@Lab-59-PA-500> show system disk-space    [example output]

Filesystem            Size  Used Avail Use% Mounted on

/dev/sda2             3.8G  1.2G  2.5G  31% /

/dev/sda5             7.6G  3.3G  3.9G  47% /opt/pancfg

/dev/sda6             3.8G  2.5G  1.2G  69% /opt/panrepo

tmpfs                 487M   37M  451M   8% /dev/shm

/dev/sda8              51G  1.9G   47G   4% /opt/panlogs


admin@Lab-59-PA-500> show system logdb-quota


             traffic: 32.00%, 14.643 GB

              threat: 16.00%, 7.322 GB

              system: 4.00%, 1.830 GB

              config: 4.00%, 1.830 GB

               alarm: 3.00%, 1.373 GB

               trsum: 8.40%, 3.844 GB

         hourlytrsum: 2.40%, 1.098 GB

          dailytrsum: 0.60%, 0.275 GB

         weeklytrsum: 0.60%, 0.275 GB

               thsum: 2.80%, 1.281 GB

         hourlythsum: 0.80%, 0.366 GB

          dailythsum: 0.20%, 0.092 GB

         weeklythsum: 0.20%, 0.092 GB

             appstat: 9.60%, 4.393 GB

              userid: 2.40%, 1.098 GB

            hipmatch: 3.00%, 1.373 GB

   application-pcaps: 1.00%, 0.458 GB

        threat-pcaps: 1.00%, 0.458 GB

  debug-filter-pcaps: 1.00%, 0.458 GB

         hip-reports: 1.00%, 0.458 GB

            dlp-logs: 1.00%, 0.458 GB

Disk usage:

traffic: Logs: 211M, Index: 54M

threat: Logs: 53M, Index: 2.8M

system: Logs: 954M, Index: 149M

config: Logs: 97M, Index: 1.4M

alarm: Logs: 16K, Index: 16K

trsum: Logs: 138M, Index: 5.7M

hourlytrsum: Logs: 2.4M, Index: 2.4M

dailytrsum: Logs: 1.4M, Index: 2.2M

weeklytrsum: Logs: 728K, Index: 468K

thsum: Logs: 612K, Index: 772K

hourlythsum: Logs: 600K, Index: 600K

dailythsum: Logs: 560K, Index: 560K

weeklythsum: Logs: 88K, Index: 88K

appstatdb: Logs: 6.2M, Index: 5.7M

userid: Logs: 12K, Index: 12K

hipmatch: Logs: 16K, Index: 16K

application-pcaps: 32M

threat-pcaps: 60K

debug-filter-pcaps: 26M

dlp-logs: 4.0K

hip-reports: 1.1M

wildfire: 4.0K

Let me know if this helps.



L4 Transporter

Re: Questions on Palo Alto safe practices

Hi Srikanth,

Reboot device, monitor the boot sequence for the following message: Autboot to default partition in 3 seconds.

  1. Select m to boot to maintenance partition.  OR type "maint" to enter into maintenance mode.

Once you execute that, you will be in maint mode .

Additionally to factory default the device,

  1. From the maint partition select factory reset.
  2. At the password prompt, enter MA1NT.
  3. Allow the device to complete the boot sequence.
  4. After booting is completed, login using the default username password.

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