Question

Cisco 'show asp drop' logging question

Asked by: vaughnskinner

I'm trying to troubleshoot a weird vpn reliability issue.  Along the way I found 'show asp drop frame'.

What is the meaning of "Slowpath security checks failed"?  

Also, is there a way to turn on acl-drop logging without adding log rules to each acl drop?

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Asked On
2009-08-19 at 14:52:55ID24666533
Tags

cisco asa

Topics

Cisco PIX Firewall

,

Virtual Private Networking (VPN)

Participating Experts
1
Points
50
Comments
2

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Answers

 

by: ccie22921Posted on 2009-08-19 at 15:58:55ID: 25138165

This counter is incremented and the packet is dropped when the security appliance:

"Is in routed mode and receives a through-the-box:

L2 broadcast packet

IPv4 packet with destination IP address equal to 0.0.0.0

IPv4 packet with source IP address equal to 0.0.0.0

Recommendation: Determine if an external user is trying to compromise the protected network. Check for misconfigured clients.

System log messages: 106016

"Is in routed or transparent mode and receives a through-the-box IPv4 packet with:

The first octet of the source IP address is equal to zero

The source IP address is equal to the loopback IP address

Network part of the source IP address is equal to all 0s

The network part of the source IP address is equal to all 1s

The source IP address host part is equal to all 0s or all 1s

Recommendation: Determine if an external user is trying to compromise the protected network. Check for misconfigured clients.

System log messages: 106016

"In routed or transparent mode and receives an IPv4 or IPv6 packet with the same source and destination IP addresses

Recommendation: If this message counter is incrementing rapidly, an attack may be in progress. Use the packet capture feature to capture type asp packets, and check the source MAC address in the packet to see where they are coming from.

System log messages: 106017

On question 2, not aware of any

 

by: vaughnskinnerPosted on 2009-08-19 at 16:04:20ID: 31617911

Thank you.

20120131-EE-VQP-002

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