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Cisco 3600 IP NAT Ager proc overload cpu usage

Good day.

Could you please help me with problem bellow. We got a cisco 3600 router with follow data:

Cisco IOS Software, 3600 Software (C3640-IK9O3S-M), Version 12.4(19b), RELEASE SOFTWARE (fc1)

System image file is "flash:c3640-ik9o3s-mz.124-19b.bin"

As you can see from title i find out that router cpu overloaded with usage of IP NAT Ager proc. I was make a little research and many answers was pointed on buggy ios. How i can find is my IOS fresh enough, or it's needs to be renewed, and if it is needs to be renewd how can i get a newer ver of ois. Or if it is not required to be renewed, how i can troubleshoot my problem.

We have a network about 200 users, and very often cpu usage verry overloaded. i was run a comand cache verbose flow, but i can't understand it output, can u please help me with it

***net#show ip cache verbose flow

IP packet size distribution (40905782 total packets):

   1-32   64   96  128  160  192  224  256  288  320  352  384  416  448  480

   .000 .488 .057 .033 .017 .009 .007 .005 .005 .004 .004 .004 .005 .003 .003

    512  544  576 1024 1536 2048 2560 3072 3584 4096 4608

   .003 .003 .012 .028 .302 .000 .000 .000 .000 .000 .000

IP Flow Switching Cache, 278544 bytes

  679 active, 3417 inactive, 3374714 added

  48039300 ager polls, 0 flow alloc failures

  Active flows timeout in 1 minutes

  Inactive flows timeout in 15 seconds

IP Sub Flow Cache, 42120 bytes

  679 active, 1369 inactive, 3374714 added, 3374714 added to flow

  0 alloc failures, 0 force free

  2 chunks, 26 chunks added

  last clearing of statistics never

Protocol         Total    Flows   Packets Bytes  Packets Active(Sec) Idle(Sec)

--------         Flows     /Sec     /Flow  /Pkt     /Sec     /Flow     /Flow

TCP-Telnet         103      0.0        21   106      0.0      40.5       7.1

TCP-WWW        1860524     21.3         9   641    213.1       4.2       7.6

TCP-SMTP           143      0.0       166   882      0.2      12.3       2.7

TCP-X                5      0.0         6   269      0.0       2.1       9.6

TCP-other      1466906     16.8        14   441    248.5       3.8      11.9

UDP-DNS             24      0.0         4    61      0.0       7.6      15.5

UDP-NTP            849      0.0         1    76      0.0       0.1      15.5

UDP-other        38900      0.4         2   103      1.1      11.5      15.4

ICMP              6581      0.0        77    84      5.8      50.9       2.8

Total:         3374035     38.6        12   527    469.0       4.2       9.6

SrcIf          SrcIPaddress    DstIf          DstIPaddress    Pr TOS Flgs  Pkts

Port Msk AS                    Port Msk AS    NextHop              B/Pk  Active

Fa0/0          62.33.158.75    Fa0/1*         78.100.33.10    06 00  18       1

0497 /29 0                     01BB /0  0     0.0.0.0                81     0.0

FFlags: 01

Fa0/0          62.33.158.75    Fa0/1*         173.194.32.53   06 00  10       1

0506 /29 0                     01BB /0  0     0.0.0.0                40     0.0

FFlags: 01

Fa0/1          128.140.168.216 Fa0/0*         192.168.2.190   06 00  1B       3

07FA /0  0                     D1C3 /0  0     0.0.0.0                49     0.5

FFlags: 01

Fa0/1          94.100.184.16   Fa0/0*         192.168.2.224   06 00  11       1

0050 /0  0                     F583 /0  0     0.0.0.0                40     0.0

FFlags: 01

Fa0/0          62.33.158.75    Fa0/1*         94.100.187.29   06 00  1A       4

04EA /29 0                     07F9 /0  0     0.0.0.0               174     0.9

FFlags: 01

Fa0/1          213.180.204.210 Fa0/0*         192.168.2.135   06 60  18       1

0050 /0  0                     C9A9 /0  0     0.0.0.0                47     0.0

FFlags: 01

Fa0/0          62.33.158.75    Fa0/1*         78.100.33.10    06 00  18       1

04BB /29 0                     01BB /0  0     0.0.0.0                81     0.0

FFlags: 01

Fa0/0          62.33.158.75    Fa0/1*         92.123.155.73   06 00  18      42

SrcIf          SrcIPaddress    DstIf          DstIPaddress    Pr TOS Flgs  Pkts

Port Msk AS                    Port Msk AS    NextHop              B/Pk  Active

0514 /29 0                     0050 /0  0     0.0.0.0                69    11.9

FFlags: 01

Fa0/1          80.239.148.210  Fa0/0*         192.168.2.140   06 00  1A       4

0050 /0  0                     D2AD /0  0     0.0.0.0               721     1.1

FFlags: 01

Fa0/1          2.23.143.139    Fa0/0*         192.168.2.137   06 00  18       1

0050 /0  0                     C27E /0  0     0.0.0.0               454     0.0

FFlags: 01

Fa0/0          62.33.158.75    Fa0/1*         178.250.1.71    06 00  1A       6

E8E6 /29 0                     0050 /0  0     0.0.0.0               750     6.6

FFlags: 01

Fa0/0          62.33.158.75    Fa0/1*         78.109.87.4     06 00  1B       9

CF35 /29 0                     0050 /0  0     0.0.0.0                96     7.7

FFlags: 01

Fa0/0          62.33.158.75    Fa0/1*         69.171.227.41   06 00  18       2

C444 /29 0                     0050 /0  0     0.0.0.0               545     0.0

FFlags: 01

Fa0/0          62.33.158.75    Fa0/1*         70.77.195.77    06 00  18     108

F643 /29 0                     1545 /0  0     0.0.0.0                58    13.9

FFlags: 01

Fa0/0          62.33.158.75    Fa0/1*         70.77.195.77    06 00  18       6

F645 /29 0                     1545 /0  0     0.0.0.0               132    10.4

FFlags: 01

Fa0/0          62.33.158.75    Fa0/1*         70.77.195.77    06 00  18     116

F644 /29 0                     1545 /0  0     0.0.0.0                59    15.9

FFlags: 01

Fa0/0          62.33.158.75    Fa0/1*         70.77.195.77    06 00  18       6

F646 /29 0                     1545 /0  0     0.0.0.0               132    10.3

FFlags: 01

Fa0/1          81.176.76.83    Fa0/0*         192.168.2.137   06 00  10       1

0050 /0  0                     C289 /0  0     0.0.0.0                40     0.0

FFlags: 01

Fa0/0          62.33.158.75    Fa0/1*         94.100.179.73   06 00  10       1

CB57 /29 0                     0050 /0  0     0.0.0.0                41     0.0

FFlags: 01

Fa0/1          207.46.124.180  Fa0/0*         192.168.2.63    06 00  18      16

0050 /0  0                     0414 /0  0     0.0.0.0               310    39.5

FFlags: 01

......

Thanks a lot.

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