Dear BACnet/IP Working Group Members: I'd like to share with the group the email exchange I had with Dean Matsen which raises the problems caused by Port...
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rolandlus
Mar 11, 2006 10:56 pm
Dear IP-WG: I spent a couple of hours on this sunny Saturday looking into the complications caused to B/IP by dynamic NAT and PAT. Here are the conclusions I...
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Christopher.J.McCann@...
cmccanc
Mar 13, 2006 1:48 pm
Roland, We had advised this solution as a way to fix the problem with NATs; however, many IT departments are having a problem with assigning one global address...
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Buddy Lott
buddylottatwork
Mar 13, 2006 2:13 pm
All, I am still have trouble seeing how this proposed changes are going to "solve" the problems with BBMDs, FDs, IP Fowarding, NAT, PAT, and DHCP. In order to...
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Donaldson, Stuart (WA...
stuart42d
Mar 13, 2006 5:27 pm
The proposal that has been discussed in the working group meetings, and which Roland is coordinating and authoring is really aimed at a minimal set of changes...
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Buddy Lott
buddylottatwork
Mar 13, 2006 6:10 pm
I think the immediate problem is easily fixed when the BBMD is embedded in a BACNet router capable of handling multiple BACnet IP networks. This requires no...
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Roland Laird
rolandlus
Mar 13, 2006 8:23 pm
More side discussions on NAT: _____ From: Matsen, Dean (WA26) [mailto:Dean.Matsen@...] Sent: Monday, March 13, 2006 10:00 AM To: Roland Laird Cc:...
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Roland Laird
rolandlus
Mar 13, 2006 8:24 pm
The embedded BACnet Router in the BBMD is required in RL-002 for NAT with more than one device. I will try to take some time this week to add diagrams and...
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Roland Laird
rolandlus
Mar 14, 2006 2:04 am
Hi Chris, I don't understand the concern with "other routers that may have different MS/TP networks". The way I see it the NAT aware BBMD/Router will update...
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Matsen, Dean (WA26)
deanmatsen
Mar 14, 2006 4:34 pm
As much as I hate to say it, perhaps a new technology is needed. It seems to me that if we started from scratch, we would wind up with something that was kind...
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Jimmy Rimmer
rimbo_ccm
Mar 14, 2006 8:38 pm
Dean, are you proposing a new technology separate from B/IP, or a full revision of B/IP -- call it B/IP version 2? Either way, I know that I'd be interested in...
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Matsen, Dean (WA26)
deanmatsen
Mar 14, 2006 9:01 pm
The proposal I have still needs a little work (we didn't think of the implications of PAT vs. NAT either). It is a separate technology in addition to B/IP. We...
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Carl Neilson
carlneilson
Mar 16, 2006 9:22 pm
We implemented something close to what RL-002 describes many years ago and it has served us faithfully. The implementation works with other vendor's BBMD...
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Matsen, Dean (WA26)
deanmatsen
Mar 16, 2006 9:58 pm
Carl, If your solution is different from RL-002, why don't you publish it? Perhaps you have solved the problem in a way that avoids this problem. Our front end...
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Matsen, Dean (WA26)
deanmatsen
Mar 17, 2006 11:49 pm
Ok, here is a proposal that I hope is agreeable to all concerned. It requires some familiarity with RL-002 and the discussion between Roland and Myself...
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Matsen, Dean (WA26)
deanmatsen
Mar 29, 2006 11:58 pm
I want to retract proposal DCM-003 for two reasons: 1) Nobody responded to it 2) It has a nit-picky problem WRT foreign devices. I need to be able to support...
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Matsen, Dean (WA26)
deanmatsen
Mar 30, 2006 12:20 am
I have found out how to implement RL-002 in such a way that it does not have the varying B/IP address problem, AND it also does not have some of the foreign...
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Matsen, Dean (WA26)
deanmatsen
Mar 30, 2006 12:39 am
Sorry - previous message did not have the attachment. I re-sent it, but it never arrived. Dunno why. I have found out how to implement RL-002 in such a way...
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Buddy Lott
buddylottatwork
Mar 30, 2006 5:02 pm
I have a lot of the same issues that I have had with previous suggestions. Unfortunately, I have been unable to come up with a solution to these issues other...
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Matsen, Dean (WA26)
deanmatsen
Mar 30, 2006 6:33 pm
Ugh... I've not seen an example of translation on incoming packets. That's a bother. Thanks for pointing that out, I didn't know that could happen. You are...
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Buddy Lott
buddylottatwork
Mar 30, 2006 8:40 pm
IMHO: Three incorrect assumptions that a lot of proposals make are: 1) Assuming that there is only one layer of NAT. In fact, it is far more common that 2...
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Matsen, Dean (WA26)
deanmatsen
Mar 30, 2006 9:35 pm
Before I spend time trying to document an example, which implementation do you want a counterexample for? I assume you mean just allowing BDTs to be...
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Buddy Lott
buddylottatwork
Mar 30, 2006 9:48 pm
I was originally interested in the scenario you were referring to when you mentioned "all the proposals I have seen so far gloss over the impact of foreign...
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Matsen, Dean (WA26)
deanmatsen
Mar 31, 2006 3:15 am
NEW! Improved! Attachment included! ________________________________ From: Matsen, Dean (WA26) Sent: Wednesday, March 29, 2006 4:20 PM To:...
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Swan, Bill (WA26)
swan_bill
Apr 3, 2006 4:12 pm
It's retracted. Bill Swan Chair, ASHRAE/SSPC 135 (BACnet) Engineering Fellow Honeywell Automation and Control Systems Alerton ________________________________ ...
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Carl Neilson
carlneilson
Apr 3, 2006 6:47 pm
I am assuming that the blue changes are the ones applicable to this revision. Point 2 appears to be redundant (but more clearly stated) than point 5. But I...
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Matsen, Dean (WA26)
deanmatsen
Apr 3, 2006 9:34 pm
during my tests, I have seen NAT routers do both. The BAC0 port being retained outside the NAT box does occur, usually. In my case, if there is also a static...
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Roland Laird
rolandlus
Apr 6, 2006 3:11 pm
Dear IP-WG Attached is RL-002-4. I've modified a bit of wording throughout and have added points 4 and 8 from RL-002-DM-1 to the NAT configuration items. ...
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Matsen, Dean (WA26)
deanmatsen
Apr 6, 2006 5:34 pm
Dean IP-WG I see your point from 6.5.3. However, as far as establishing address of BACnet router is concerned, one should note that the "Who-Is/I-Am" method...
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Matsen, Dean (WA26)
deanmatsen
Apr 7, 2006 12:33 am
Dear IP-WG: Ok, I have implemented RL-002-4 as described, and there is still a subtle problem. It is not a specific problem with this iteration of RL-002, it...
