Wireshark-users: Re: [Wireshark-users] 8-10% packet error/loss is normal wired network?
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:
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From: Kok-Yong Tan ktan@xxxxxxxxxxxxxxxxxxx
Date: Thu, 12 Jul 2012 18:46:43 -0400
To: wireshark-users@xxxxxxxxxxxxx
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, jim@xxxxxxxxxxxxxxxxx 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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