From: Manjeet Chawla (mchawla@xxxxxxxxxx)
Date: Thu Jan 27 2000 - 12:25:14 GMT-3
Thanks to Naushad and Vaughan, here are the SAPs.
Manjeet Chawla wrote:
> Vaughan, thanks for your help.
>
> I will follow your advice and use:
>
> 0x0000 0x0D0D for SNA
> 0xF0F0 0x0101 for Netbios
>
> Is there any other traffic type I need to worry about in DLSW connections ?
>
> Thanks
> Manjeet
>
> "Lee, Vaughan" wrote:
>
> > The SNA bit is right, but I still have some doubts about the Netbios - it
> > may pick up more than just Netbios as raw IPX uses 0xFFFF. I would
> > personally use 0xF0F0 0x0101 to match against Netbios.
> >
> > Regards,
> > Vaughan
> >
> > Vaughan Lee, Network Specialist.
> > CCIE #5250
> > debis IT Services (UK) Ltd.
> > E-mail: vaughan.lee@debis.co.uk
> > Direct Phone: 01908 279561
> > Direct Fax: 01908 279061
> > http://www.debis.co.uk/
> >
> > -----Original Message-----
> > From: Manjeet Chawla [mailto:mchawla@asanet.com]
> > Sent: 27 January 2000 13:32
> > To: Lee, Vaughan
> > Subject: Re: SNA and Netbios SAPS
> >
> > This is a publically posted lab"DLSW 401" on www.fatkid.com and has hints a
s
> > well as solution posted too. In hint section, item # 11 mentions it as SAP
> > type
> > and the then in the solution it is applied as mask.
> >
> > In nutshell, if I am understanding it right, to cover all SNA SAPs, I can
> > use
> > 0x0000 mask 0D0D and to cover all Nebios SAPs 0x0000 0x0F0F. Is this right
?
> >
> > TIA
> > -Manjeet
> >
> > "Lee, Vaughan" wrote:
> >
> > > Not having seen the solution, it is either wrong or you may have
> > interpreted
> > > it wrongly by taking the mask in a 200 range access list to be the SAP.
> > >
> > > The SAP for Netbios is 0xF0F0. The SAP for SNA though INCLUDES 0x0404 but
> > > goes further, leading to a neat way of coding a 200 range access list.
> > >
> > > SNA SAPs are actually 0x04, 0x08 and 0x0C. The last bit of the SSAP is
> > used
> > > to distinguish command or response functionality in XID or TEST LLC
> > frames,
> > > and the last bit of the DSAP is used for flow control. Including the test
> > /
> > > XID frames using a SAP of 0x00, this means that for SNA the 0x04, 0x08 an
d
> > > 0x01 bits of the SAP can all be either 1 or 0, and so can be ignored in a
n
> > > access list. All other bits, however, MUST be 0. This leads to a single
> > > catch all line for SNA in an access list where the DSAP/SSAP are specifie
d
> > > as 0x0000 and the mask is specified as 0x0D0D (which is one of the answer
s
> > > you seem to have).
> > >
> > > I may be that Netbios has also been matched in the access-list as 0xF0F0
> > > with a mask of 0x0F0F (another of your answers), though that answer could
> > > also pick up IPX raw which uses 0xFFFF in the DSAP / SSAP fields.
> > >
> > > Hope thats of some help!
> > >
> > > Regards,
> > > Vaughan
> > >
> > > Vaughan Lee, Network Specialist.
> > > CCIE #5250
> > > debis IT Services (UK) Ltd.
> > > E-mail: vaughan.lee@debis.co.uk
> > > Direct Phone: 01908 279561
> > > Direct Fax: 01908 279061
> > > http://www.debis.co.uk/
> > >
> > > -----Original Message-----
> > > From: Manjeet Chawla [mailto:mchawla@asanet.com]
> > > Sent: 26 January 2000 20:19
> > > To: CCIE Group Study
> > > Subject: SNA and Netbios SAPS
> > >
> > > While going through one of the DLSW lab scenarios, I found that the
> > > solution to the scenario mentioned that the sap type for SNA traffic is
> > > if 0x0F0F and for Netbios it is 0x0D0D. I thought that was 0404 for SNA
> > > and F0F0 for Netbios.
> > >
> > > Can some one please explain.
> > >
> > > Thanks
> > > Manjeet Chawla
> > >
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