[jcifs] max_xmit - why 4280?

Michael B Allen ioplex at gmail.com
Thu Mar 11 15:28:24 MST 2010

On Thu, Mar 11, 2010 at 12:14 PM, Del Merritt <del at alum.mit.edu> wrote:
> A question was raised a while back about getting a DcerpcException with the
> message "Fragmented request PDUs currently not supported":
> http://article.gmane.org/gmane.network.samba.java/6745/match=fragmented+request+pdus
> I am seeing this too, and it appears that the values for max_xmit and
> max_recv are hardcoded to 4280 in jcifs/dcerpc/DcerpcHandle.java; I'm using
> JCIFS 1.3.14 as a baseline.
> Is there a reason for this limit?  Is it something that should be negotiated
> and just hasn't happened yet?  I'm still learning the ins and outs of CIFS
> as I am porting JCIFS to a J2ME environment.

Hi Del,

Those are just observed values.

Note that JCIFS supports fragmented response PDUs. It just doesn't
support fragmented *request* PDUs. It's somewhat unusual for a DCERPC
request to contain a lot of data. Usually it's the response that is


Michael B Allen
Java Active Directory Integration

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