[nsp] bstun & async

[Tomas Daniska]

first,  'normal' telnet does not allow for transfer of special
characters etc.; there are, however, some extensions (see rfc2217) -
they call them 'com port control' that allow for what you need. cisco
supports this for ages but i'm not aware if it might be initialized from
commandline


second, cisco allows several kinds of reverse telnet - it depends on
what tcp port range you use (i.e. 2xxx, 4xxx etc.). 2xxx runs telnet
protocol, 4xxx is pure tcp stream. try playing with autocommand telnet
using the 4xxx port range

third, if you don't neccessarily need tcp then use udptn (autocommand
udptn....) - it does not stall in case some packets are lost. of course
this way you need to have reliability solved within your applications...
udptn also is compatible with lantronix boxes

fourth, there are a few products that emulate com ports on windows and
are able to reap from the rfc2217 extensions, like dialout/ez (please
note that dialout/ip does not support this) from tactical software. they
allow for full transport of hardware flowcontrol etc.


i have very good experience with dialout/ez and cisco terminal servers,
at loads of customers. they use everything from [xyz]modem to
proprietary apps that never had been designed for wan use, without any
problems


hth


--

deejay 

> -----Original Message-----
> From: Keoseyan, Scott [mailto:Scott.Keoseyan at Broadwing.com] 
> Sent: 19. marca 2003 18:36
> To: alexl at alkar.net; cisco-nsp at puck.nether.net
> Subject: RE: [nsp] bstun & async
> 
> 
> Any chance this could be done over reverse-telnet issued as 
> an autocommand on the lines on one side terminating on the 
> TCP port associated with the line on the other?  Since it's 
> just character-oriented traffic it should pass-thru a telnet 
> session similar to doing a zmodem tranfer from a unix-host to 
> terminal-emulation software on a PC, I would think.
> 
> -sak
> 
> 
> > -----Original Message-----
> > From: alexl at alkar.net [mailto:alexl at alkar.net]
> > Sent: Wednesday, March 19, 2003 8:12 AM
> > To: cisco-nsp at puck.nether.net
> > Subject: [nsp] bstun & async
> > 
> > 
> > Hi,
> > 
> > I need to connect several remote terminals between them. I 
> > tried to use
> > async bstun tunnel over FR. For testing purpose I've 
> connect one PC to
> > Async1 on first 2511 and another PC on second 2511. 2511s 
> is connected
> > back to back via frame relay:
> > 
> >       +---+    Async1+------+  FR  +------+Async1    +---+
> >       |PC1|----------|2511-1|------|2511-2|----------|PC2|
> >       +---+          +------+      +------+          +---+
> > 
> > I see chars, typed in PC1's HyperTerm, on PC2 and vice versa, but I
> > can't transfer any file via Xmodem/Ymodem/Zmodem. Also I tried to
> > connect modem instead of PC2 and run PPP, result is poor 
> too - I can't
> > ping PC1 with packet size greater then about 900 bytes, all 
> > packets has
> > been lost. Seems like tunnel doesn't work when async link 
> load is near
> > 100%. Do you have any ideas to fix this problem? Configuration of
> > 2511-1 and 2511-2 here:
> > 
> > 2511-1:
> > frame-relay switching
> > !
> > bstun peer-name 10.0.0.1
> > bstun protocol-group 1 async-generic
> > !
> > frame-relay switching
> > !
> > interface Serial0
> >  no ip address
> >  encapsulation frame-relay
> >  load-interval 30
> >  no fair-queue
> >  frame-relay map bstun 17
> >  frame-relay lmi-type cisco
> >  frame-relay intf-type dce
> > !
> > interface Async1
> >  no ip address
> >  encapsulation bstun
> >  load-interval 30
> >  async mode dedicated
> >  bstun group 1
> >  bstun route all interface Serial0 dlci 17
> >  asp role primary
> >  asp addr-offset 0
> >  asp rx-ift 6
> > !
> > line 1 16
> >  special-character-bits 8
> >  no exec
> >  transport output none
> >  stopbits 1
> > 
> > 
> > 2511-2:
> > frame-relay switching
> > !
> > bstun peer-name 10.0.0.2
> > bstun protocol-group 1 async-generic
> > !
> > interface Serial0
> >  no ip address
> >  encapsulation frame-relay
> >  load-interval 30
> >  no fair-queue
> >  frame-relay map bstun 17
> >  frame-relay lmi-type cisco
> > !
> > interface Async1
> >  no ip address
> >  encapsulation bstun
> >  load-interval 30
> >  async mode dedicated
> >  bstun group 1
> >  bstun route all interface Serial0 dlci 17
> >  asp role secondary
> >  asp addr-offset 0
> >  asp rx-ift 6
> > !
> > line 1 16
> >  special-character-bits 8
> >  no exec
> >  transport output none
> >  stopbits 1
> > 
> > -- 
> > Sincerely,
> > Alexey Luckyanchikov
> > _______________________________________________
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