[Sunhelp] Slow TFTP with NCD 19R xterminal?

[Gregory Leblanc]

> -----Original Message-----
> From: Bill Bradford [mailto:mrbill at frenzy.com]
> Sent: Monday, November 01, 1999 12:02 AM
> To: sunhelp at sunhelp.org
> Subject: [Sunhelp] Slow TFTP with NCD 19R xterminal?
> 
> 
> I've got a problem - my NCD 19R xterminal takes about half an' hour
> to boot its OS image file ("Xncd19r, 2.4meg) off my Ultra 5.  Tftp on
> the U5 looks fine:
> 
> bash-2.03# tftp
> tftp> connect localhost
> tftp> get Xncd19r
> Received 2443968 bytes in 2.4 seconds
> tftp> quit
> bash-2.03# 
> 
> The ethernet cable I'm using is about 35 feet long.  I've got 
> an AUI cable
> coming out of the back of the 19R into a AUI to 10baseT/RJ45 
> transceiver 
> made by SynOptics, then a RJ45/cat5 10bt cable down the hall into the 
> Accton 10bt switch in the "computer room".  Once the OS image 
> is loaded,
> the xterminal works just fine - so I can rule out a  bad cable (which 
> would show up as packet loss or whatever).
> 
> Bootp works fine (the terminal gets its IP address, IP config 
> info, and
> the name of the file to boot just fine).
> 
> Here's a segment of "snoop nobody.likes.nt.workstations.org" (the DNS
> name of the xterminal):
> 
> nobody.likes.nt.workstations.org -> leenux.mrbill.net TFTP 
> Ack  block 3589
> leenux.mrbill.net -> nobody.likes.nt.workstations.org TFTP 
> Data block 3590 (512 bytes)
> nobody.likes.nt.workstations.org -> leenux.mrbill.net TFTP 
> Ack  block 3590
> leenux.mrbill.net -> nobody.likes.nt.workstations.org TFTP 
> Data block 3591 (512 bytes)
> nobody.likes.nt.workstations.org -> leenux.mrbill.net TFTP 
> Ack  block 3590
> leenux.mrbill.net -> nobody.likes.nt.workstations.org TFTP 
> Data block 3591 (512 bytes)

I thought TFTP was designed for non-reliable, low overhead data transfers?
Why is it acking packets on a reliable network, where speed is important?  I
thought TFTP didn't ack anything, although it looks like I'm mistaken.  
Next comment/question:  What do the switch/NIC lights look like durring this
transfer(you should have plenty of time to look)?  Do they bink just every
3-4 seconds, or constantly?
	Greg

> 
> Its doing one pair of lines every 3-4 seconds.
> 
> Any suggestions?  Theoretically the terminal should be able 
> to download
> and boot the file in 3-5 seconds, according to a friend who 
> has a 19R as
> well.
> 
> Bill (desperately needing a 19R manual) 
> 
> -- 
> Bill Bradford * mrbill at sunhelp.org * http://www.sunhelp.org
> ------------------------------------------------------------
> From a Sun Microsystems bug report (#4102680):
> "Workaround: don't pound on the mouse like a wild monkey."
> 
> _______________________________________________
> SunHELP maillist  -  SunHELP at sunhelp.org
> http://www.sunhelp.org/mailman/listinfo/sunhelp
>