RE: Why do some TFTP sessions take a lot longer [7:35006]
Ok all ' thanks for all the ideas.. All routers are 1601, all running the same ver of IOS. I have tested all the Eth ports on routers in fashion by TFTP'ing on the same laptop the same image with the same cable and all the routers do the task within few seconds of each other.I attribute the slight diff here due to very minor inconsistancies within the Eth interfaces and or the NIC on the laptop. All routers are directly connected via a Xover cable right into the PC. The lab in question had some pretty tired ISA NICs. And that was the lab that had the weird numbers.. In both classes this week, the exact same scenario produced pretty much normal results with about a 7 second varience across the 6 routers. BUT all both sets of PC's had newer PCI 10 /100 nics.. Also I was talkng with a friend of mine who works on WAN managment software project and the application does kinda realtime hardware and software monitoring. He was telling me that he has had nic cards that can take up to 3 seconds to respond to his app whereas the normal response time is .2 of a second. Ok I know .2 of a sec is a lifetime on a wan but that time includes the time to pull the info from the PC and whack it thru this app and a DB etc.. But the interesting point is when the slow response machines had the NIC swapped out it . the lethargy went away and the machines resonded in the normal time frame for the app... This bring's up a couple of points. I. Slow NICS did a driver re-install fic this >> 2. Taking the NIC out of the #1 PCI slot (which is usually a shared slot help. Both question could not be answered as the fix is always to replace the NIC. However is there a freeware app out there that can test a NIC out for thru put. AS over the years I have had servers which give me probs like this and I want to eliminate the NIC, but swapping them out is not a viable test method as then the server has to be taken down. But if the NCI is slow then I don't mind doing the swap Oz Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=35592&t=35006 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Why do some TFTP sessions take a lot longer [7:35006]
Are all of the routers identical ? Are all of your Ethernet interfaces 100mb/full duplex. Do you see any errors on them? ... collisions, FCS, etc. Are the PC NIC's configured the same ? Out Of Curiosity - what make/model are the NICs? Are the PC's OS and software loads identical - i.e., are any of then doing anything funky? Note - I would recommend, if you haven't already, making everything 100mb/FD "locked", no auto anything :). Or start troubleshooting the old-fashioned way ... Are they consistent - i.e. - is this week's "slow set" the same next week, or no? If you take a "slow set" and plug that router into a "fast set" ... and try again ... does the "slow router" become "fast"? ... etc. Thanks! TJ >""Ozzie Sutcliffe"" wrote in message >[EMAIL PROTECTED]">news:[EMAIL PROTECTED]... >> When I do the TFTP lab in class.. >> I have 6 routers 6 PC and 6 Xover cables >> All have the same configs except for IP addy's >> Yet when the class pulls down the IOS the times for a 7 meg bin file vary >> from 4 to 15 minutes. >> The cables are all the same length same company who made them. >> The routers are all 1601's the pc's and NIC's the same all running windoze >> 98 SE. >> Ideas anyone ?? >> This week I will sniff each PC and see what that bring up . >> >> >> Ideas anyone ?? >> >> >> I will post the results next saturday >> >> Oz * The information in this email is confidential and may be legally privileged. It is intended solely for the addressee. Access to this email by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, distribution or any action taken or omitted to be taken in reliance on it, is prohibited and may be unlawful. When addressed to our clients any opinions or advice contained in this email are subject to the terms and conditions expressed in the governing KPMG client engagement letter. * Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=35081&t=35006 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Why do some TFTP sessions take a lot longer [7:35006]
>One possibility might be TCP window size. There was a post here a *long* >time ago about Internet access speeds with DSL and cble modems. The poster, >without making any hardware changes, increased his download speeds by >several times via a registry setting (I think it was RWIN or something of >the sort, but I just don't recall). The point would be how much download do >you get per ACK? TFTP doesn't use TCP. It uses UDP, plus its own stop-and-wait retransmission protocol. TFTP records are a fixed size, IIRC 512 bytes. Remember that TFTP was originally designed to fit into a small ROM, which couldn't possibly hold TCP. Full TFTP implementations usually are under 10K bytes. > >FWIW > >Annlee Hines >""Ozzie Sutcliffe"" wrote in message >[EMAIL PROTECTED]">news:[EMAIL PROTECTED]... >> When I do the TFTP lab in class.. >> I have 6 routers 6 PC and 6 Xover cables >> All have the same configs except for IP addy's >> Yet when the class pulls down the IOS the times for a 7 meg bin file vary >> from 4 to 15 minutes. >> The cables are all the same length same company who made them. >> The routers are all 1601's the pc's and NIC's the same all running windoze >> 98 SE. >> Ideas anyone ?? >> This week I will sniff each PC and see what that bring up . >> >> >> Ideas anyone ?? >> >> >> I will post the results next saturday >> >> Oz Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=35067&t=35006 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Why do some TFTP sessions take a lot longer [7:35006]
One possibility might be TCP window size. There was a post here a *long* time ago about Internet access speeds with DSL and cble modems. The poster, without making any hardware changes, increased his download speeds by several times via a registry setting (I think it was RWIN or something of the sort, but I just don't recall). The point would be how much download do you get per ACK? FWIW Annlee Hines ""Ozzie Sutcliffe"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > When I do the TFTP lab in class.. > I have 6 routers 6 PC and 6 Xover cables > All have the same configs except for IP addy's > Yet when the class pulls down the IOS the times for a 7 meg bin file vary > from 4 to 15 minutes. > The cables are all the same length same company who made them. > The routers are all 1601's the pc's and NIC's the same all running windoze > 98 SE. > Ideas anyone ?? > This week I will sniff each PC and see what that bring up . > > > Ideas anyone ?? > > > I will post the results next saturday > > Oz Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=35040&t=35006 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Why do some TFTP sessions take a lot longer [7:35006]
try checking the NIC card duplexing and speed setting sometimes this things will hamper the job^_^ ""Ozzie Sutcliffe"" When I do the TFTP lab in class.. > I have 6 routers 6 PC and 6 Xover cables > All have the same configs except for IP addy's > Yet when the class pulls down the IOS the times for a 7 meg bin file vary > from 4 to 15 minutes. > The cables are all the same length same company who made them. > The routers are all 1601's the pc's and NIC's the same all running windoze > 98 SE. > Ideas anyone ?? > This week I will sniff each PC and see what that bring up . > > > Ideas anyone ?? > > > I will post the results next saturday > > Oz Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=35029&t=35006 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
