From: k c (jwongccie@yahoo.com.hk)
Date: Thu May 12 2005 - 12:07:38 GMT-3
Hi Sean & Group,
I want to clarify again. I use Ethereal to capture the dlsw packets and find that only 2065 is used. In searching DLSW using 2067 port, I find in new RFC 2166 that new enhancement (new single session bi-directional TCP/IP connection) using tcp port 2067. I wonder whether Cisco has implemented this and whether in exam, we need to include tcp 2067 port.
http://www.potaroo.net/ietf/idref/rfc2166/
In RFC 1795, single session TCP/IP connections are accomplished by
first establishing two uni-directional TCP connections, exchanging
capabilities, and then bringing down one of the connections. In
order to avoid the unnecessary flows and time delays associated with
this process, a new single session bi-directional TCP/IP connection
establishment algorithm is defined.
6.2.1.1 TCP Port Numbers
DLSws implementing these enhancements will use a TCP destination port
of 2067 (as opposed to RFC 1795 which uses 2065) for single session
TCP connections. The source port will be a random port number using
the established TCP norms which exclude the possibility of either
2065 or 2067.
Regards.
Sean C <Upp_and_Upp@hotmail.com> <6<g:
Hi K C,
I can't validate if this is still true or not, but I remember a valuable
discussion on this topic from GroupStudy last year:
http://www.groupstudy.com/archives/ccielab/200407/threads.html#00564
Also, you may want to consider matching on source and destination port 2067
as well as 2065.
HTH,
Sean
----- Original Message -----
From: "k c"
To:
Sent: Sunday, May 08, 2005 10:52 AM
Subject: Match Protocol or Match ip address
> Hi Group,
>
> In order to classify dlsw packets, which one is preferred in the lab:
>
> class-map match-all dlsw
> match protocol dlsw
>
> or using access-list:
>
> class-map match-all DLSW
> match access-group 150
> access-list 150 permit tcp any any eq 2065
> access-list 150 permit tcp any eq 2065 any
>
> Also in priority list:
> priority-list 1 protocol ip high tcp 2065
> or
> priority-list 1 protocol dlsw high
>
> Thanks.
>
>
>
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