Re: Re: FidoNews 33:04 [01/05]: List Of Fidonet Ipv6 Nodes
  By: Wilfred van Velzen to Stephen Hurd on Thu Jan 28 2016 10:41 am

 > Hi Stephen,
 >
 > On 2016-01-27 21:08:55, you wrote to me:
 >
 >  >> So thank god for good dupe checking... Hmm, if only sbbsecho would do
 >  >> that on  forwarded messages...
 >
 >  SH> Is that a bug report or a feature request?
 >
 > I would call it a design flaw. ;)
 >
 >  SH> I haven't done much sbbsecho work except in response to bug reports,
 >  SH> but now is a good time to make sbbsecho feature requests.
 >
 >  SH> In what way is the current sbbsecho misheaving?
 >
 > Rob explained it to me as follows:
 >
 > "The duplicate message checking occurs in the Synchronet Message Base (SMB)
 > library, which is not specific to FidoNet or any other networking
 > technology.  So whether a message is imported via QWK, NNTP, SMTP, PostLink,
 > FTN, or  whatever-future-networking-technology, it is subjected to the same
 > database of  hashes to detect duplicates.
 >
 > When an FTN message packet is processed by SBBSecho but the message is not
 > imported into a local message base (e.g. pass-through area or passing
 > between  up/downlinks), the SMB library is thus not involved (the message
 > would go  straight from one FTN packet to another FTN packet), never
 > touching a  Synchronet message base."
 >
 > So as I understand it the dupe checking only happens when messages are
 > imported
 > into the message base. But by then the message is already tossed/send to all
 > connected links...

For non-pass-through areas, the message is tossed/sent to connected links
*after* the message has been imported/dupe-detected. SBBSecho has behaved this
way since at least 2001 and probably since its inception circa 1994. Messages
detected as duplicate (either by Message-ID or body text) are not forwarded to
downlinks.

For pass-through areas, SBBSecho only performs circular path detection before
tossing/sending to connected links, though that is a more "recent" feature.

                                            digital man

Synchronet "Real Fact" #83:
The Electronic Frontier Foundation used to run Synchronet (circa 1993).
Norco, CA WX: 60.2øF, 29.0% humidity, 6 mph W wind, 0.00 inches rain/24hrs
--- SBBSecho 2.99-Win32