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[SRX] TCP syn-flood white list

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Article ID: KB23418 KB Last Updated: 30 Mar 2012Version: 1.0
Summary:
Beginning with Junos 12.1, customers can configure the TCP syn-flood with a white list to bypass  the check on certain traffic flow.

Symptoms:
  • Beginning with Junos 12.1, customers can configure the TCP syn-flood with a white list to bypass the check on certain traffic flow.

  • This feature is useful, when customers have devices in the network, which make use of TCP traffic for availability check.

  • In this situation, with the configuration of the white list, such traffic can bypass the TCP syn-flood check and avoid potential false alarms.
Cause:
Start from JUNOS version 12.1, customer can configure TCP syn-flood with white-list to by-pass checking on certain traffic flow.

Solution:
The following configuration command options is added:
[edit security screen ids-option screen1 tcp syn-flood]
lab@srx220a.hk# set white-list ?
Possible completions:
  <name>               White-list name
[edit security screen ids-option screen1 tcp syn-flood]
lab@srx220a.hk# set white-list wl1 ?
Possible completions:
  <[Enter]>            Execute this command
  |                    Pipe through a command
+ apply-groups         Groups from which to inherit configuration data
+ apply-groups-except  Don't inherit configuration data from these groups
+ source-address       Source address
+ destination-address  Destination address
[edit security screen ids-option screen1 tcp syn-flood]

Users can specify the traffic flow, by configuring the source-address and/or destination-address for the white-list option. Both the source-address and destination address can be an IP prefix.

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