On 2015-05-29 16:35, paul_kon...@dell.com wrote:
On May 29, 2015, at 6:22 AM, Johnny Billquist <b...@update.uu.se> wrote:
On 2015-05-29 08:18, Matt Thomas wrote:
...
I have a Phase IV+ (so I didn’t have to much with the physical address)
implementation but never got around to writing the apps. socket interface is
identical to DECnet-ULTRIX. DAP is a beast as is CTERM. I could run IP
protocols over, but then I have IP for that. :)
If you say that you didn't fiddle with physical addresses, then you have been
playing Phase V, as Phase IV requires that you manipulate the physical address.
And that is also true of IV+.
Maybe Matt meant IV-prime? That’s an obscure variant of Phase IV invented to
allow DECnet to run on 802.5 networks. I recently found a spec for it. It
isn’t all that hard; the changes are just in the routing layer. And yes, it
allows you to keep your physical address, so long as all the neighbors you need
to talk to also run IV-prime.
I remember seeing some note about an update to Phase IV to allow
communication over 802.5 that would allow the interface to not have
DECnet-specific addresses, but I haven't actually seen any
implementation. But you could be right in that this is what Matt meant.
Of course, if you have a LAN driver and interface that supports multiple
individual addresses, you can use the HIORD style address for DECnet while
keeping the conventional physical address for other protocols. Most hardware
supports this, actually, though it’s not clear how many drivers do.
DAP would be really nice, but it's complex. But I like the capabilities.
I wouldn’t have thought of DAP as all that complex; after all it fits in PDP11
systems. You can probably subset it pretty nicely if you don’t need all the
features. Just file transfer, as opposed to transparent file I/O, is likely to
simplify things substantially. The DECnet/Linux implementation of DAP does
this, I believe, and it does a reasonably good job. I think I even got it to
talk successfully to a RSTS/E system at one time.
I've never managed to get DAP under Linux to talk with an RSX node...
And I don't think you can subset it much. Depending on the remote
machine, different parts will be exercised. But I guess things like
indexing file access could be left out. But it's still rather more
complex than anything I've seen under Unix. But possibly various remote
db protocols would be similar.
File transfer and file access in DAP is the same thing, I believe. Or
maybe you mean this in some way I'm missing.
Johnny
