RE: SNA over IP

Alexei:

Please post a message like the one below where you address IPX both with and
without MPTN.

Richard Jackson
mailto:richardjackson@richardjackson.net
http://www.richardjacksonltd.com
Voice: 1 (303) 808-8058
Fax:   1 (303) 663-4325

-|-----Original Message-----
-|From: owner-midrange-l@midrange.com
-|[mailto:owner-midrange-l@midrange.com]On Behalf Of pytel@us.ibm.com
-|Sent: Wednesday, October 04, 2000 12:50 PM
-|To: MIDRANGE-L@midrange.com
-|Subject: RE: SNA over IP
-|
-|
-|
-|There are two misconceptions here, which I often see and decided
-|to comment
-|on.
-|First, SNA is not more chatty than TCP/IP.
-|If you will look at communications trace, SNA will deliver approximately
-|the same amount of payload per same amount of LAN frames. SNA RUs do have
-|longer headers than TCP/IP packets but the difference is insignificant.
-|Second, while MPTN (aka ANYNET) certainly adds an overhead and
-|slows things
-|down, it is not encapsulation per se.
-|MPTN uses different technique.
-|
-|It's true, that SNA requires more careful configuration - there are very
-|few things you can actually configure in TCP/IP, which makes it easier to
-|use. Non-optimal configuration can lead to excessive traffic and IOP
-|utilization - which can explain your experience.
-|
-|    Alexei Pytel
-|
-|
-|
-|Chris Bipes <chris.bipes@cross-check.com>@midrange.com on 10/04/2000
-|10:47:04 AM
-|
-|Please respond to MIDRANGE-L@midrange.com
-|
-|Sent by:  owner-midrange-l@midrange.com
-|
-|
-|To:   "'MIDRANGE-L@midrange.com'" <MIDRANGE-L@midrange.com>
-|cc:
-|Subject:  RE: SNA over IP
-|
-|
-|
-|SNA is very chatty.  It will add to your network utilization.  Also
-|encapsulation any protocol over another adds over head.  Thus the IOP
-|processors have more work to do.  If you are a very heavy user of the SNA,
-|it will effect performance.  I have 3 as400s all running ANYNET and it is
-|fast on the 170 and 720.  They both have PCI 10/100 Ethernet cards, with
-|the
-|720 having two.  The model 400 running an older SPD IPCS card at
-|10mb had a
-|noticeable slow down.  The change does not effect straight
-|TCP/IP, just the
-|IOP.  If the IOP is overloaded, then you will notice a slow down of
-|straight
-|TCP/IP.  We have not had any problems on either of the boxes with ANYNET.
-|When IBM gets all the neat SNA function re-written to TCP/IP you will not
-|need ANYNET, but till then...  Tell me why do you need Anynet turned on?
-|What is the application?
-|
-|HTH,
-|
-|
-|
-|Christopher K. Bipes     mailto:ChrisB@Cross-Check.com
-|Sr. Programmer/Analyst   mailto:Chris_Bipes@Yahoo.com
-|CrossCheck, Inc.         http://www.cross-check.com
-|6119 State Farm Drive    Phone: 707 586-0551 x 1102
-|Rohnert Park CA  94928   Fax: 707 586-1884
-|
-|If consistency is the hobgoblin of little minds, only geniuses work here.
-|Karen Herbelin - Readers Digest 3/2000
-|
-|-----Original Message-----
-|From: Jim Knight [mailto:jknight@rei.com]
-|Sent: Wednesday, October 04, 2000 8:14 AM
-|To: 'Midrange Users list'
-|Subject: SNA over IP
-|
-|
-|We are looking at utilizing APPC over IP via ANYNET.  We have several
-|processes that use IP sockets
-|to look up data from our RS/6000s.  I read in the Communications
-|Configuration Manual that by
-|activating ANYNET, our sockets programs will run slower.  This is the V4R1
-|manual.  Is this still
-|true on V4R4??
-|+---
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