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Marcel_Gramalla
Advisor
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Check Point DPD (Dead Peer Detection) - Questions

Hi all,

I have two questions regarding the Dead Peer Detection between our Check Point Cluster and other existing VPN connections to non-Check Point Gateways.

1. Does enabling DPD (Responder Mode) has any impact on existing VPN connections? Can I enable it "on-the-fly" without having any disconnects to the VPN? I haven't found an answer on that yet.

2. If I change a VPN community with non-Check Point Gateways to "Permanent Tunnels" in order to active DPD with GuiDBedit does this have any impact on existing connections?

 

Thanks in advance for any help

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1 Solution

Accepted Solutions
Nick_Doropoulos
Advisor

Yes, there is. You can check with the GuiDBedit tool under Network Objects >> network_objects:

 

DPD.PNG

 

I hope this helps.

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13 Replies
Jerry
Mentor
Mentor
quickly though:

Ad.1 - it will re-estab SA/SPI indeed
Ad.2. - it will re-estab the tunnel

ps. any changes to the proxy-id or any crypt.conf params will re-key and re-estab SA/SPI
Jerry
Marcel_Gramalla
Advisor
Thanks for the quick reply. That means that we have to announce it so that if there is any issue our partners know about it.
Jerry
Mentor
Mentor
it will in 100% impact/affect an existing tunnel(s) so yes, that should be announced and planed for so called "maintenance window" 🙂

cheers
Jerry
Ravindra_Katrag
Contributor

Is there any way to check if DPD is enabled?

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Nick_Doropoulos
Advisor

Yes, there is. You can check with the GuiDBedit tool under Network Objects >> network_objects:

 

DPD.PNG

 

I hope this helps.

Ravindra_Katrag
Contributor

Thank you

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Nick_Doropoulos
Advisor

My pleasure!

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nagaraja_cs
Contributor

Can we achieve VPN redundancy with 3rd party Gateways by enabling DPD(In R80.10 or R80.20) ?

 

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Ted_Serreyn
Collaborator

Can we enable Dead Peer detection on the third party devices only?  Or do we have to enable it on the checkpoint gateways also? My understanding is if enabled on the checkpoint gateways it affects all other VPNs?

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Timothy_Hall
Legend Legend
Legend

You can set DPD per remote gateway via the tunnel_keepalive_method variable in GUIDBedit as described in this lengthy thread, you don't have to change this value for your Check Point gateway:

https://community.checkpoint.com/t5/Next-Generation-Firewall/Enable-DPD-on-R80-20/m-p/32605

Starting in R81 tunnel_keepalive_method will be set to DPD by default on all Interoperable Device object types.

Gateway Performance Optimization R81.20 Course
now available at maxpowerfirewalls.com
Gavin
Explorer

Do you know how to capture DPD packets in any way? I could see tunnel test in the logs, but seem to be missing how to spot DPD packets. I can't see them in TCPDUMP as they are encrypted. I would really appreciate some guidance on this. I am working on an AWS VPN issue where I think the tunnels are being shut down regularly and I would like to spot what is going on. I have a TAC case open but every time I ask the question they seem to swerve around it.

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PhoneBoy
Admin
Admin

fw monitor should show the packets as they are encrypted/decrypted.

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Hussien_Wahab
Employee
Employee

Hussien_Wahab_0-1673868297596.png

AWS sends "isakmp-nat-keep-alive" packets that are outside the DPD tunnel health monitoring, please see the packets in red (the ones in blue are for the actual DPD that keeps the tunnel status up and alive)

 

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