SMB problems when ICMP is blocked?

["Feeny, Michael (GWMT-TASCS)" <michael_feeny () ml com>]

Hello,

 

I'm troubleshooting a problem where a Windows XP user has problems with
a certain mapped drive (file share).  Specifically, after mapping, a
file copy from the mapped drive fails, after 10-15 seconds, with a ""The
specified network name is no longer available" message.

 

As I have dug into this, I was told that ICMP has been blocked between
the user's site and the site of the remote  file share.

 

Then, after capturing packets, I found that, in addition to the SMB
packets between the 2 endpoints, the user's workstation was sending
PINGs to the remote site.  Due to the blocking of ICMP these PINGs are
never answered.

 

My suspicion is that, when the PINGs are unanswered, the file system
decides that the remote file share host is unavailable, and the file
copy is terminated.  (In reality, the file copy seemed to be proceeding
just fine.)

 

So...  My questions are...

 

1)      Has anyone else run into this?

2)      Assuming that allowing ICMP between these sites is not an
option, does anyone know if one can disable this PING mechanism, so that
file sharing operations can proceed successfully?

 

Thx,

Michael

 

Michael Feeny 
Bank of America / Merrill Lynch

Global Wealth Management Technology 
Technology Architecture, Strategy & Core Services 

Application Infrastructure Services

Office: 609-274-2761 
Mobile:  484-995-1745 
AOL IM: feenyman99 

 


--------------------------------------------------------------------------
This message w/attachments (message) may be privileged, confidential or proprietary, and if you are not an intended 
recipient, please notify the sender, do not use or share it and delete it. The information contained in this e-mail was 
obtained from sources believed to be reliable; however, the accuracy or completeness of this information is not 
guaranteed. Unless specifically indicated, this message is not an offer to sell or a solicitation of any investment 
products or other financial product or service, an official confirmation of any transaction, or an official statement 
of Merrill Lynch. Subject to applicable law, Merrill Lynch may monitor, review and retain e-communications (EC) 
traveling through its networks/systems. The laws of the country of each sender/recipient may impact the handling of EC, 
and EC may be archived, supervised and produced in countries other than the country in which you are located. This 
message cannot be guaranteed to be secure or error-free. References to "Merrill Lynch" are references to any company in 
the Merrill Lynch & Co., Inc. group of companies, which are wholly-owned by Bank of America Corporation. Securities and 
Insurance Products: * Are Not FDIC Insured * Are Not Bank Guaranteed * May Lose Value * Are Not a Bank Deposit * Are 
Not a Condition to Any Banking Service or Activity * Are Not Insured by Any Federal Government Agency. Past performance 
is no guarantee of future results. Attachments that are part of this E-communication may have additional important 
disclosures and disclaimers, which you should read. This message is subject to terms available at the following link: 
http://www.ml.com/e-communications_terms/. By messaging with Merrill Lynch you consent to the foregoing.
--------------------------------------------------------------------------
 

___________________________________________________________________________
Sent via:    Wireshark-users mailing list <wireshark-users () wireshark org>
Archives:    http://www.wireshark.org/lists/wireshark-users
Unsubscribe: https://wireshark.org/mailman/options/wireshark-users
             mailto:wireshark-users-request () wireshark org?subject=unsubscribe