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CSS11051 Group PAT NAT Issue

Hello All,

I have encountered CSS11501 Group PAT NAT problem.

All of available port 63488 have been consumed. This cause SMTP server initiate sesson to customer failed.

The network is simple.

Internet Customer--------- VIP-202.x.x.x
CSS11501----SMTP server farm(10.10.10.x)

Our SMTP server need initate TCP SMTP to internet customer used ACL NAT. The group VIP save as content VIP.

During that time, internet customers connected our server SMTP VIP was no problem.

I don't know how to use command to check what detial NAT session consumed PAT port.

"show flows" only see TCP seesion original from coustmer side. Checked SMTP server, few sessions try to connect outside, but failed. No problem found.

I had to suspend group SMTP and then active, the connections restored. Normally Current Mapped Ports:   111  High Water Mark:        189.

This problem occured twice time. When next time this problem appear, how to troubleshooting to determine what sessions consume all PAT port?

If know it, it will very useful to investigate further.

Please advice, give me some clue.

sho group                     

Groups:


The Group
      O                                O     
     /|\         _._   \  O  _._      /|\    
   (o\_)=="=#     |     \/ _> |      (\_)="=#
      |\          | [_] __[_] |       /|     
      |/          |  | /  \|  |       \|     
      ~~         /|\/|\\__/|\/|\      ~~     
Group: SMTP - Index: 1   Active (202.x.x.x Not Redundant)
  Session Redundancy: Disabled

  Last Clearing of Stats Counters:  07/23/2008 23:40:49

Associated ACLs:  1/55, 1/56, 1/57, 1/58, 1/59, 1/91,
                    1/92, 1/93
  Source Services:
    NONE

  Destination Services:
    NONE

  Group Service Total Counters:
    Hits/Frames/Bytes:         0/0/0
    Connections Total/Current: 0/0
    FTP Control Total/Current: 0/0
    Total No Portmap Errors:   21576

  SFP Port Map Info:
  Configured Base Port:     2016    Total Configured Ports:  63488

  Module: 1
  Ports Avail to this SP: 63488     VIP Address:               202.x.x.x
  Current Mapped Ports:   63488     Last Mapped Port:          33342
  High Water Mark:        63488     Current Cntrl Channels:    1
  No Portmap Errors:      21576 

  No Port Flags:
   ffffffff

  Portmap (ports in use) - 7936 bytes:

   Chunk Base Port:   2016, Chunk Index:   0, Number Ports Per Chunk:  1984
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff

   Chunk Base Port:   4000, Chunk Index:   1, Number Ports Per Chunk:  1984
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff

   Chunk Base Port:   5984, Chunk Index:   2, Number Ports Per Chunk:  1984
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff

   Chunk Base Port:   7968, Chunk Index:   3, Number Ports Per Chunk:  1984
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff

   Chunk Base Port:   9952, Chunk Index:   4, Number Ports Per Chunk:  1984
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff

   Chunk Base Port:  11936, Chunk Index:   5, Number Ports Per Chunk:  1984
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff

   Chunk Base Port:  13920, Chunk Index:   6, Number Ports Per Chunk:  1984
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff

   Chunk Base Port:  15904, Chunk Index:   7, Number Ports Per Chunk:  1984
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff

   Chunk Base Port:  17888, Chunk Index:   8, Number Ports Per Chunk:  1984
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff

   Chunk Base Port:  19872, Chunk Index:   9, Number Ports Per Chunk:  1984
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff

   Chunk Base Port:  21856, Chunk Index:  10, Number Ports Per Chunk:  1984
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
        
   Chunk Base Port:  23840, Chunk Index:  11, Number Ports Per Chunk:  1984
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff

   Chunk Base Port:  25824, Chunk Index:  12, Number Ports Per Chunk:  1984
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff

   Chunk Base Port:  27808, Chunk Index:  13, Number Ports Per Chunk:  1984
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff

   Chunk Base Port:  29792, Chunk Index:  14, Number Ports Per Chunk:  1984
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff

   Chunk Base Port:  31776, Chunk Index:  15, Number Ports Per Chunk:  1984
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff

   Chunk Base Port:  33760, Chunk Index:  16, Number Ports Per Chunk:  1984
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff

   Chunk Base Port:  35744, Chunk Index:  17, Number Ports Per Chunk:  1984
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff

   Chunk Base Port:  37728, Chunk Index:  18, Number Ports Per Chunk:  1984
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff

   Chunk Base Port:  39712, Chunk Index:  19, Number Ports Per Chunk:  1984
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff

   Chunk Base Port:  41696, Chunk Index:  20, Number Ports Per Chunk:  1984
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff

   Chunk Base Port:  43680, Chunk Index:  21, Number Ports Per Chunk:  1984
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff

   Chunk Base Port:  45664, Chunk Index:  22, Number Ports Per Chunk:  1984
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
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   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
        
   Chunk Base Port:  47648, Chunk Index:  23, Number Ports Per Chunk:  1984
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   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
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   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff

   Chunk Base Port:  49632, Chunk Index:  24, Number Ports Per Chunk:  1984
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
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   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
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   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff

   Chunk Base Port:  51616, Chunk Index:  25, Number Ports Per Chunk:  1984
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
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   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
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   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff

   Chunk Base Port:  53600, Chunk Index:  26, Number Ports Per Chunk:  1984
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   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff

   Chunk Base Port:  55584, Chunk Index:  27, Number Ports Per Chunk:  1984
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
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   Chunk Base Port:  57568, Chunk Index:  28, Number Ports Per Chunk:  1984
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   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff

   Chunk Base Port:  59552, Chunk Index:  29, Number Ports Per Chunk:  1984
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
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   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff

   Chunk Base Port:  61536, Chunk Index:  30, Number Ports Per Chunk:  1984
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
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   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff

   Chunk Base Port:  63520, Chunk Index:  31, Number Ports Per Chunk:  1984
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
   ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff

Thank You

Jeffrey

3 REPLIES
Cisco Employee

Re: CSS11051 Group PAT NAT Issue

Jeffrey,

there is no command to check which port is being used by which connection.

Normally, doing a 'show flow' will show you the connections and you can see the ports.

If your number of connections is lower than the number of ports being used, there is a problem.

Here is some more info you can capture :

From debug mode (type 'llama' to enter this mode) issue :

- show group

- show sync portmap  ! you get the index from the command above.  ! do it for every index.

- show sync portmapglobals

- flow statist all

You probably want to make sure that you run the latest version.

If the problem comes back, open a service request with the TAC so that we can analyse the data.

Gilles.

New Member

Re: CSS11051 Group PAT NAT Issue

Hi Gilles,

The "show flow" was lower than the number of ports being used. I didn't see any original flow from server to outside, only see outside to server.

The CSS version is sg0820201.

These show command you posted are very useful.

Thank you so much.

Jeffery

Re: CSS11051 Group PAT NAT Issue

Hi Jeff,

To set the flow states of TCP and UDP ports in the CSS flow-state table, use the flow-state command.


To configure flow parameters for the CSS, use the flow command. The options for this global configuration mode command are as follows:

flow permanent - Creates permanent TCP or UDP ports that are not reclaimed

flow reserve-clean - Reclaims interval flows with port numbers less than or equal to 23

flow tcp-mss - Configures the TCP maximum segment size that the CSS expects to receive from the transmitting device

flow statistics - Displays statistics on currently allocated flows


Flow parameter setup by the CSS is restricted on the following TCP or UDP ports: 67 (BOOTP server), 68 (BOOTP client), 137 (NETBIOS name service), 138 (NETBIOS datagram service), 161 (SNMP), 162 (SNMP traps), 520 (RIP), and 8089 (restricted UDP only).

The CSS allows you to configure a maximum of 20 TCP or UDP ports that have permanent connections and will not be reclaimed by the CSS when the flows are inactive. Use the flow permanent port1 portnumber (through flow permanent port 20 portnumber) commands to configure a TCP or UDP port as a permanent connection. Enter a port number from 0 to 65535. The default is 0.

A CSS may reclaim flows that have not received an ACK or content request after approximately 15 seconds. To prevent the CSS from reclaiming flows to a specific source or destination port, specify one of the flow permanent port commands and identify the TCP or UDP port number you do not want reclaimed.

For example, to configure port 80 as a permanent connection, enter:

(config) flow permanent port1 80


To reset the port number for port1 to 0, enter:

(config) no flow permanent port1


It is  recommend that when you configure a flow permanent port command you also enable the cmd-sched command to periodically remove the permanent port and allow for cleanup.

++++++++++++++++++++++

Control ports have port numbers less than or equal to 23.

When the CSS determines that one of these ports has a flow with asymmetrical routing, it reclaims the port.

Use the flow reserve-clean command to define how often the CSS scans flows from reserved Telnet and FTP control ports to reclaim them.

Enter the flow reserve-clean time, in seconds, as the interval the CSS uses to scan flows.

Enter an integer from 0 to 100. The default is 10. To disable the port reclaiming process, enter a flow reserve-clean value of 0.

For example, to specify an interval of 36 seconds:

(config)# flow reserve-clean 36
To disable flow cleanup on Telnet and FTP control ports, enter:

(config)# no flow reserve-clean


++++++++++++++++++++++++++++

Use the flow statistics command to display statistics on active flows or Flow Control Blocks (FCBs) on the CSS interfaces.

++++++++++++++++++++++++++++

To display summary information about redundant dormant flows, use the flow statistics dormant command.

++++++++++++++++++++++++++++

Use this feature with a CSS to configure flow inactivity timeout values for TCP and UDP flows on a per content rule and per source group basis.

This timeout value is not the frequency with which a CSS reclaims flow resources, but is the time period that must elapse for an idle flow before the CSS marks the flow for cleanup.

++++++++++++++++++++++++++++

To specify the number of seconds for which an idle flow can exist before the CSS tears it down, use the flow-timeout-multiplier command. Specify this command in owner-content or group configuration mode.

The syntax for this command is:

flow-timeout-multiplier number


++++++++++++++++++++++++++++

Kindly check the following URL for your perusal:

http://www.cisco.com/en/US/docs/app_ntwk_services/data_center_app_services/css11000series/v6.10/configuration/administration/guide/Flow.html#wp1005277


Best regards,

Sachin Garg

Message was edited by: sachinga.hcl

Message was edited by: sachinga.hcl

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