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New Member

Cisco 3560 cannot ping with large size

Dear friends,

I have the Cisco 3560 switch. I can ping both from switch to server or from server to switch. However, I cannot ping with large size, for example,

ping 192.168.1.1 size 10000 (failed all).

I can ping 192.168.1.1 size 5000

(the size allow between <36-18024>)

It's normal or a problem with the cable or something else? Please help me.

Because I have the error about working with MSSQL server 2008 R2, the error is:

[DBNETLIB][ConnectionWrite (send()).]General network error. Check your network documentation

OS: Microsoft Server 2008 R2 Standard

2 REPLIES
New Member

Cisco 3560 cannot ping with large size

I do not think there is any issue if you fail with such sized ping or transmission. I have observed that most of the devices fail to ping with a packet size of 14xx bytes.

I think it has a bit connection with fragmentation and MTU size. Please let me know the exact error you face with your SQL setup.

Regards,

Parvesh Paliwal

New Member

Cisco 3560 cannot ping with large size

Dear Parvesh Paliwal,

I have 2 cisco routers 2901 and 2911, both I can ping with size 18024, but I cannot ping with the size above 5000 with the Cisco 3560 switch.

About the database error, from the clients, the error often display. The error message:

[DBNETLIB][ConnectionWrite (send()).]General network error. Check your network documentation

I google and do many suggest but no luck.

support.microsoft.com/?id=899599

communities.vmware.com/thread/329241?start=15&tstart=0

support.microsoft.com/?id=951037

The error is: [DBNETLIB][ConnectionWrite (send()).]General network error. Check your network documentation, the error show often but sometime 30 minuses, sometime 1 hour or 2 hours.

I have tried:

Click Start, click Run, type regedit, and then click OK.
    Locate and then click the following registry key:
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
    On the Edit menu, point to New, and then click DWORD Value.
    Type SynAttackProtect, and then press ENTER.
    On the Edit menu, click Modify.
    In the Value data box, type 00000000. Click OK.
    Quit Registry Editor.

and:

netsh int tcp set global chimney=disabled

also I disabled the chimney on the NIC card configuration.

I also changed:

Change the following key in Windows (2000, XP, 2003, Vista, 2008, 2008 R2, Windows 7):

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters

Value Name:  TcpMaxDataRetransmissions
Data Type:   REG_DWORD - Number
Valid Range: 0 - 0xFFFFFFFF (I changed to 120)
Default:     5
                         

Change the following key in Windows (2000, XP, 2003, Vista, 2008, 2008 R2, Windows 7):

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\ID for Adapter

Value Name:  TCPInitialRtt
Data Type:   REG_DWORD
Valid Range: 300-65535 (milliseconds in decimal) (I changed to 60000)
Default:     0xBB8 (3000 milliseconds expressed in hexadecimal)
                         

But no success.

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