Wireshark-users: Re: [Wireshark-users] 8-10% packet error/loss is normal wired network?
Date: Thu, 12 Jul 2012 19:03:50 -0400
Yes, that's right. If one device has its speed and duplex set manually with
autonegotiation off, and the other device has autonegotiation on, the
device with autonegotiation on will be able to detect the speed setting of
the other device but not the duplex setting, so it will default to half
duplex.

Flako: Are these managed or unmanaged switches?

Original Message:
-----------------
From: Kok-Yong Tan [email protected]
Date: Thu, 12 Jul 2012 18:46:43 -0400
To: [email protected]
Subject: Re: [Wireshark-users] 8-10% packet error/loss
isnormalwired	network?


Since the OP didn't mention anything about whether the switch the 
printer is connected to is manageable or not, I assumed that it's an 
unmanaged dumb switch with no duplex settings possible (i.e., these are 
usually set to autonegotiate). Since OP's printer is set to full duplex 
and has autonegotiation disabled and is directly connected to an 
autonegotiating switch, that means the port on the switch which OP's 
printer is connected to will failover into half-duplex. So there's a 
duplex mismatch right there, no?

On 7/12/12 18:05, [email protected] wrote:
> That is not correct. It would be a good practice to use the same
> autonegotiation settings throughout your network, but the printer and the
> desktop PC do NOT have to match. Autonegotiation takes place only between
> two directly connected NICs. The NIC in the desktop PC must have the same
> autonegotiation settings as the port that it is connected to on switch C.
> The NIC in the printer must have the same autonegotiation settings as the
> port that it is connected to on switch B. The desktop PC and the printer
do
> not autonegotiate with each other. They do not have a direct physical
> connection to each other.


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