Half-open sessions

Discussion in 'Cisco' started by Jason, Sep 9, 2005.

  1. Jason

    Jason Guest

    On a 7206VXR running 12.3(13)a, a 'show ip inspect statistics' reveals:
    Interfaces configured for inspection 65
    Session creations since subsystem startup or last reset 334621
    Current session counts (estab/half-open/terminating) [1534:63:0]
    Maxever session counts (estab/half-open/terminating) [1676:314:27]
    Last session created 00:00:00
    Last statistic reset 11:53:44
    Last session creation rate 978
    Last half-open session total 1274

    The ip inspect configuration is:
    Session audit trail is disabled
    Session alert is enabled
    one-minute (sampling period) thresholds are [3500:4000] connections
    max-incomplete sessions thresholds are [2000:2500]
    max-incomplete tcp connections per host is 300. Block-time 0 minute.
    tcp synwait-time is 30 sec -- tcp finwait-time is 5 sec
    tcp idle-time is 3600 sec -- udp idle-time is 30 sec
    dns-timeout is 5 sec

    I had to increase the values for the max-incomplete low and high from
    1200:1500, since previously the 'show ip inspect statistics' was
    returning 'Half-open sessions or session creation rate exceeded'. Is
    there a way to view the full table of half-open sessions? A 'show ip
    inspect sessions' only returns the sessions seen in the current session
    counts. And is there a way to clear said table, in the same manner as
    clearing the nat table?
    Jason, Sep 9, 2005
    #1
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