From: phase90 (phase90@comcast.net)
Date: Tue May 27 2003 - 22:45:56 GMT-3
There once was a doc on cisco.com where the mask is 0x0d0d. This covers SAPs
04 08 and 0B
but you need the 1 bit for command or response - hence the 0dx.
Jerry
----- Original Message -----
From: Hunt Lee <huntl@webcentral.com.au>
To: 'Jonathan V Hays' <jhays@jtan.com>; <ccielab@groupstudy.com>; 'Joe
Chang' <changjoe@earthlink.net>
Cc: 'FATHALLAH' <sfathallah@mail.cbi.net.ma>
Sent: Tuesday, May 27, 2003 8:16 PM
Subject: RE: Filtering SNA
> Hi guys,
>
> I wrote out the whole thing... So is it the case where as soon as there
is
> a 1, I put a 1 in the bottom? If so, for LSAP type codes 00, 04, 08, 0C
>
> 4 0100 <--- no zeros on last 2 digits
> 5 0101
> 6 0110
> 7 0111
> 8 1000 <--- no zeros on last 2 digits
> 9 1001
> 10 1010 A
> 11 1011 B
> 12 1100 C <--- no zeros on last 2 digits
> 13 1101 D
> 14 1110 E
> 15 1111 F
>
> -----------
> 1100
>
> So would the answer be:
>
> access-list 200 permit 0x0000 0x0C00 (but NOT 0x0000 0x0c0c)
>
>
>
> And another eg. if we want to allow only 04 & 06...
>
> 4 0100
> 5 0101
> 6 0110
> 7 0111
> 8 1000
> 9 1001
> 10 1010 A
> 11 1011 B
> 12 1100 C
> 13 1101 D
> 14 1110 E
> 15 1111 F
>
> -----------
> 0110
>
>
> So would the answer be:
>
> access-list 200 permit 0x0000 0x010A
>
>
> My I correct?
>
> Regards,
> H.
>
>
>
> -----Original Message-----
> From: Jonathan V Hays [mailto:jhays@jtan.com]
> Sent: Wednesday, 28 May 2003 3:48 AM
> To: ccielab@groupstudy.com
> Cc: 'FATHALLAH'; 'lg01'
> Subject: RE: Filtering SNA
>
>
> Hexadecimal 'B' is *not* a multiple of 4, but 'C' is.
>
> 8 1000
> 9 1001
> 10 1010 A
> 11 1011 B
> 12 1100 C <-
> 13 1101 D
> 14 1110 E
> 15 1111 F
>
>
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> > Behalf Of FATHALLAH
> > Sent: Tuesday, May 27, 2003 11:09 AM
> > To: lg01; ccielab@groupstudy.com
> > Subject: RE: Filtering SNA
> >
> >
> > 00 04 08 0B all are multiple of 4. so 0C0C mean that the
> > first and second
> > bits must be "0" and Third or/and fourth can be 1 or 0. witch
> > give you 00,
> > 04, 08,0B.
> >
> > Said FATHALLAH
> >
> > -----Message d'origine-----
> > De : nobody@groupstudy.com [mailto:nobody@groupstudy.com]De la part de
> > lg01
> > Envoyi : mardi 27 mai 2003 11:01
> > @ : ccielab@groupstudy.com
> > Objet : Filtering SNA
> >
> >
> > Hello group,
> >
> > If anyone can shed some lights on this, that would be greatly
> > appreciated.
> >
> > In an exercise, it asked me to only allow SNA traffic from
> > RTA. And it said
> > that the SNA ports used will be 00, 04, 08 & 0B.
> >
> > But somehow... the answwer config gives:
> >
> > access-list 200 permit 0x0000 0x0C0C
> >
> > But I don't understand how they dervie / calculate this ACL.
> >
> > Thanks.
> >
> > H.
> >
> >
> > _______________________________________________
> > No banners. No pop-ups. No kidding.
> > Introducing My Way - http://www.myway.com
This archive was generated by hypermail 2.1.4 : Mon Jun 02 2003 - 15:13:49 GMT-3