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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