From:
wireshark-users-bounces@xxxxxxxxxxxxx
[mailto:wireshark-users-bounces@xxxxxxxxxxxxx] On Behalf Of Feeny, Michael (GWMT-TASCS)
Sent: Thursday, March 04, 2010
5:25 PM
To: wireshark-users@xxxxxxxxxxxxx
Subject: [Wireshark-users] SMB
problems when ICMP is blocked?
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
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