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Knowledge Base

Can't ping SoftX3000's ip address with packets which bigger than 128 bytes

Publication Date:  2012-07-27  |   Views:  134  |   Downloads:  0  |   Author:  Li Weixing  |   Document ID:  EKB0000165464

Contents

Issue Description

In a NGN project ,we can't ping SoftX3000's ip address with packets which bigger than 128 bytes ,but with small ping packets ,can be sent perfactly
The network topology :
UMG-NE40-NE40-S3528P-SoftX3000

Alarm Information

No.

Handling Process

After checking all the interface use comman disp interface */*/* ,the first two possible reasons were excluded.
But SoftX3000 suppress packets which bigger than 128 bytes to pass , it limited the big packets to pass for securty.
 

Root Cause

Possible reasons:
 1. The interface negotiation result is different between S3528 and SoftX3000.
 2. The Maximum Transmit Unit is too small in some interface  .
 3. Limited by device .

Suggestions

Some times we should believe our Datacomm device's permence after we try all of the  methods, but no use .