All weekend I've been wondering about the pings over 200 bytes that don't
work! ;-)
Have you tried anything other than ping? Does the problem happen in both
directions or just in one? You didn't tell us anything about the machine
you are doing the testing from. If it's a router, it's hard to try other
applications, but not impossible. Try Telnet and use an IOS command that
would cause a lot of output. Try TFTPing the IOS to a TFTP server. Is it a
router that supports Web management. Does that work?
Were you just jerking our chains? There's no way we can help without more
detail and some comments on what else you have tried. Some of the questions
that get asked on this list are about as silly as me asking, "When I take
Route X to the mall, I get lost. Can you tell me why?"
Sometimes, we make fun of Cisco ;-), but their troubleshooting method
really does work. Instead of broadcasting a message without any detail, try
the steps in their troubleshooting method (taught for the CCNP test)
define the problem
gather facts
consider possibilities
create an action plan
implement the plan
observe results
Priscilla
At 12:59 PM 7/22/01, Michael Todd wrote:
>I have a suggestion for this problem...
>If packets only above a certain datagram size are being dropped, perhaps one
>of the devices that the pings are traversing has it's MTU set way too low. A
>good way to troubleshoot this is to do an extended ping with the DF set and
>try pinging with sweeping sizes. You will get in return which device is
>denying the packet due to it's MTU and don't fragment set to 1. This will
>tell you what device it is stopping at and what it's configured MTU is. Hope
>this helps.
>Michael ToddJohn Neiberger wrote:
> >
> > Did you check your duplex settings on both ends of that
> > connection? Your
> > end device may be set for half duplex and the switch might be
> > set for full
> > duplex. This sort of thing happens regularly with
> > autonegotiation. If you
> > have auto turned on anywhere, turn it off and hard set your
> > settings.
> >
> > Check those settings and let us know if that's not the
> > problem. If it
> > isn't, it will probably be something pretty interesting.
> >
> > John
> >
> > | I'm loosing all the packets above 170 bytes which is
> > unusual, and there
> > are
> > | no late collisions and its a FastE connected to a Switch.
> > |
> > | Regards,
> > |
> > | Tarry
> > |
> > |
> > |
> > | -----Original Message-----
> > | From: John Neiberger [mailto:[EMAIL PROTECTED]]
> > | Sent: Saturday, July 21, 2001 5:50 AM
> > | To: [EMAIL PROTECTED]
> > | Subject: Re: Datagram size bigger than 200 get packet loss
> > [7:13166]
> > |
> > |
> > | Check your interfaces for late collisions. It could be that
> > you have a
> > | duplex mismatch and a device that is set for full duplex is
> > stomping on
> > | other devices set for half duplex. This is very common when
> > you have
> > | devices connected to an ethernet hub. They should all be
> > set for half
> > | duplex, and if one of them is set for full duplex it will
> > transmit
> > without
> > | checking to see if someone else is transmitting.
> > |
> > | You didn't say how much packet loss you had, but in the
> > scenario above,
> > the
> > | larger the packet transmitted by the half duplex station,
> > the more likely
> > it
> > | is that the full duplex station will try to transmit at the
> > same time.
> > |
> > | HTH,
> > | John
> > |
> > | | Hi All,
> > | |
> > | | When I try to ping with a Datagram Size bigger than 200
> > in a LAN I get
> > | | packet loss. Dose any one know the reason?
> > | |
> > | | Regards,
> > | |
> > | | Tarry
> > | |
> > | |
> > | | --
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________________________
Priscilla Oppenheimer
http://www.priscilla.com
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