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[ScreenOS] What does 'Enable Replay Protection' do?

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Article ID: KB6727 KB Last Updated: 13 Aug 2013Version: 3.0
Summary:
What does 'Enable Replay Protection' do?
Symptoms:
When would I enable Replay Protection?
Solution:
A replay attack is when a hacker intercepts packets and uses them later to flood the system causing denial of service attacks (DoS) or to gain access to the internal network.  The 'Enable Replay Protection' enables the ScreenOS device to check every IPSec packet to see if it has already been received.  ScreenOS looks at the sequence number in the ESP header and if the packets arrive out of a specified sequence range, the packets are dropped. 

To enable this feature via the WebUI:  
  1. Click VPNs
  2. Select AutoIKE
  3. Choose Advanced
  4. Then check "Replay Protection"
To enable this feature via the CLI: 
set vpn {vpn-name} ike no-anti-replay
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