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dgalazv
dgalazv
New Member
May 27, 2020
Question

ippse vpn crashes due to non-use

  • May 27, 2020
  • 3 replies
  • 3968 views
Hello, I hope you are well, I need your help on my fortinet 100D equipment, I have several tunnels raised, but there are times when the client does not generate traffic and the tunnel falls, I cannot make the tunnel stay up always, can you help us please

3 replies

sw2090
SuperUser
sw2090
SuperUser
May 28, 2020

I'd suggest enabling NAT-T on these and make it send keep alive packets to avoid that.

sw2090
SuperUser
sw2090
SuperUser
May 28, 2020

I'd suggest enabling NAT-T on these and make it send keep alive packets to avoid that.

sw2090
SuperUser
sw2090
SuperUser
May 28, 2020

sorry for triple post that was due to this forums damn time limits :\

 

emnoc
emnoc
New Member
May 28, 2020

When you say tunnels, how long are your rekey timers? What you could do is set a extremely long phase1 and phase2 timers for  the SAs.

 

i.e all of these settings can be done from CLI

 

ph1

  172800 /* that's max value in fortiOS 6.2.4  do not think it has changed of the last few years

   set keylife 172800

ph2

  86400

 

  set keylifeseconds  86400

  set keepalive enable

   

And they monitor? Keep in mind DPD if used, is going to tear down the tunnels if it indicates a failure. So if your remote-vpn stops sending traffic and the higher up IPSEC-SAs times out and no auto-KeepAlives your tunnel will died.

 

And lastly be aware of DPD support and lack of in the forticlient if that is your dialup-ipsec-client assuming we are talking dialup vpns. Difference types of vpnclients  ( windows vrs macosx ) and version seems to play a big part if DPD does work or not.

 

Ken Felix

 

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