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ASA normal asp drop counters?

This is a vague question but I guess I need to start somewhere.

In a smaller sized environment, I see the following counters on a 5510 w/ a CSC module...

Frame drop:
  SVC Module does not have a session (mp-svc-no-session)                                          1
  Unsupported IP version (unsupported-ip-version)                                                          1
  No route to host (no-route)                                                                                     223
  Reverse-path verify failed (rpf-violated)                                                                       88
  Flow is denied by configured rule (acl-drop)                                                          73233
  First TCP packet not SYN (tcp-not-syn)                                                               44862
  TCP failed 3 way handshake (tcp-3whs-failed)                                                         8883
  TCP RST/FIN out of order (tcp-rstfin-ooo)                                                              34487
  TCP SEQ in SYN/SYNACK invalid (tcp-seq-syn-diff)                                                    1
  TCP packet SEQ past window (tcp-seq-past-win)                                                     348
  TCP invalid ACK (tcp-invalid-ack)                                                                                4
  TCP ACK in 3 way handshake invalid (tcp-discarded-ooo)                                             1
  TCP RST/SYN in window (tcp-rst-syn-in-win)                                                              40
  TCP packet failed PAWS test (tcp-paws-fail)                                                            717
  Output QoS rate exceeded (rate-exceeded)                                                          33810
  Early security checks failed (security-failed)                                                               44
  Slowpath security checks failed (sp-security-failed)                                               39152
  ICMP Error Inspect no existing conn (inspect-icmp-error-no-existing-conn)                    67
  DNS Inspect invalid packet (inspect-dns-invalid-pak)                                                     1
  DNS Inspect invalid domain label (inspect-dns-invalid-domain-label)                                1
  DNS Inspect id not matched (inspect-dns-id-not-matched)                                          107
  FP L2 rule drop (l2_acl)                                                                                      138157
  Packet shunned (shunned)                                                                                      329
  Dropped pending packets in a closed socket (np-socket-closed)                                 349
  Invalid ASDP packet received from SSM card (ssm-asdp-invalid)                                    2
  Service module is down (ssm-app-fail)                                                                        71

  Inspection failure (inspect-fail)                                                                                2050
  DTLS hello processed and closed (dtls-hello-close)                                                         3

Last clearing: 10:24:52 CDT Jul 30 2013 by root

I'm bothered by the sp-security failed and first not syn counters particularly.  Do these values look normal?

Thank you

Everyone's tags (1)
3 REPLIES

ASA normal asp drop counters?

Hello Daron,

Well that´s a really odd question to answer as it will require a deep troubleshooting of the network.

For an ASA that it´s on the border of the network I would say it would expected to see a lot of those drops as the ASA might be required to drop offending packets,

If U want to know what are the packets that are being drop you can do it via the command

cap asp type-asp drop all (you could filter the captura to just capture certain drops)


For Networking Posts check my blog at http://www.laguiadelnetworking.com

Cheers,

Julio Carvajal Segura

Julio Carvajal
Senior Network Security and Core Specialist
CCIE #42930, 2xCCNP, JNCIP-SEC
New Member

ASA normal asp drop counters?

Indeed, I suppose a really odd question...

What I'm looking for is a "normally you don't see any counters for inspect fail unless there's a problem with ******, so you might want to look into ******"

I have an exceptionally noisy network here with hit and miss internet performance issues.  Not entirely sure where to start, other then asking could any values on these counters be abnormal?  I'm familar with the ASA just not that familar with it...

Thank you......

ASA normal asp drop counters?

Hello Daron,

Start with the captures,

That would be my recommendation.

Check my blog at http:laguiadelnetworking.com for further information.

Cheers,

Julio Carvajal Segura

Julio Carvajal
Senior Network Security and Core Specialist
CCIE #42930, 2xCCNP, JNCIP-SEC
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