ZyXEL ZyWALL USG 2000 User Guide - Page 875
I cannot con some items in IDP that I can con in Snort.
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Chapter 56 Troubleshooting The ZyWALL's performance seems slower after configuring IDP. Depending on your network topology and traffic load, binding every packet direction to an IDP profile may affect the ZyWALL's performance. You may want to focus IDP scanning on certain traffic directions such as incoming traffic. IDP is dropping traffic that matches a rule that says no action should be taken. The ZyWALL checks all signatures and continues searching even after a match is found. If two or more rules have conflicting actions for the same packet, then the ZyWALL applies the more restrictive action (reject-both, reject-receiver or reject-sender, drop, none in this order). If a packet matches a rule for rejectreceiver and it also matches a rule for reject-sender, then the ZyWALL will reject-both. I uploaded a custom signature file and now all of my earlier custom signatures are gone. The name of the complete custom signature file on the ZyWALL is 'custom.rules'. If you import a file named 'custom.rules', then all custom signatures on the ZyWALL are overwritten with the new file. If this is not your intention, make sure that the files you import are not named 'custom.rules'. I cannot configure some items in IDP that I can configure in Snort. Not all Snort functionality is supported in the ZyWALL. The ZyWALL's performance seems slower after configuring ADP. Depending on your network topology and traffic load, applying an anomaly profile to each and every packet direction may affect the ZyWALL's performance. ZyWALL USG 2000 User's Guide 875
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