 | | | hw tcp v4 csum failed?? | hw tcp v4 csum failed?? 2005-01-21 - By Keith Deterling
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Try also, ethtool eht0 - which will show you the nic settings, as shown
below, and let you change them.
You want to be sure that both the switch and the nic are set to
autonegotiate or hard ffull or half.
And that whatever it is set to matches the settings on the switch.
I have see a lot of problems where the switch was set to 100 Full-Duplex,
and the Nic was set to 100 Auto-Negotiate, or vice versa.
Ethtool also lets you set the speed and autonegotiation features of the
nic.
# ethtool eth0
Settings for eth0:
Supported ports: [ TP MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Advertised auto-negotiation: Yes
Speed: 100Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 1
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: puag
Wake-on: g
Link detected: yes
>Typically, 10/Full is not correct. It very well could be, but it's very
>abnormal. You might want to verify that the switch is 10/Full and not
>10/Half.
Dan
On Fri, 2005-01-21 at 11:59 -0600, Brent M. Clements wrote:
> > The system is a web hosting server at a hosting provider plugged into
a
> > cisco switch. It's set at 10Mb because of our purchased rate.
> >
> > -Brent
> >
> > On Fri, 21 Jan 2005, Mike Kercher wrote:
> >
> > > Are you plugged into a switch or a hub? I'd wonder why your link
speed is
> > > 10Mb FD instead of 100Mb FD
> > >
> > > Mike
> > >
> > > We have a
> > > e100: eth0: Intel(R) PRO/100 Network Connection
> > > e100: eth0 NIC Link is Up 10 Mbps Full duplex
> > >
> > > And this is the driver info.
> > >
Keith Deterling
IMD Server Support (Dept. F6YY)
IBM Global Services, NorthEast Region, Essex, Junction, VT
deterlin@(protected)
Tie-Line 8-446-3535
External 802-769-3535
Fax: (802)-769-4253 (T/L: 8-446-4253)
I am not able
to unfold, how this cautelous enterprise of licensing can be
exempted from the number of vain and impossible attempts. And he
who were pleasantly disposed could not well avoid to liken it to
the exploit of that gallant man who thought to pound up the crows
by shutting his park gate.
<br><font size=2 face="sans-serif">Try also, ethtool eht0 - which will
show you the nic settings, as shown below, and let you change them.</font>
<br><font size=2 face="sans-serif">You want to be sure that both the switch
and the nic are set to autonegotiate or hard ffull or half.</font>
<br><font size=2 face="sans-serif">And that whatever it is set to matches
the settings on the switch.</font>
<br><font size=2 face="sans-serif">I have see a lot of problems where the
switch was set to 100 Full-Duplex, and the Nic was set to 100 Auto-Negotiate,
or vice versa.</font>
<br>
<br><font size=2 face="sans-serif">Ethtool also lets you set the speed
and autonegotiation features of the nic.</font>
<br>
<br><font size=2 face="sans-serif"># ethtool eth0</font>
<br><font size=2 face="sans-serif">Settings for eth0:</font>
<br><font size=2 face="sans-serif"> Supported
ports: [ TP MII ]</font>
<br><font size=2 face="sans-serif"> Supported
link modes: 10baseT/Half 10baseT/Full </font>
<br><font size=2 face="sans-serif">
100baseT
/Half
100baseT/Full </font>
<br><font size=2 face="sans-serif"> Supports
auto-negotiation: Yes</font>
<br><font size=2 face="sans-serif"> Advertised
link modes: 10baseT/Half 10baseT/Full </font>
<br><font size=2 face="sans-serif">
100baseT
/Half
100baseT/Full </font>
<br><font size=2 face="sans-serif"> Advertised
auto-negotiation: Yes</font>
<br><font size=2 face="sans-serif"> Speed: 100Mb/s<
/font>
<br><font size=2 face="sans-serif"> Duplex:
Full</font>
<br><font size=2 face="sans-serif"> Port: Twisted
Pair</font>
<br><font size=2 face="sans-serif"> PHYAD: 1</font>
<br><font size=2 face="sans-serif"> Transceiver:
internal</font>
<br><font size=2 face="sans-serif"> Auto-negotiation:
on</font>
<br><font size=2 face="sans-serif"> Supports
Wake-on: puag</font>
<br><font size=2 face="sans-serif"> Wake-on:
g</font>
<br><font size=2 face="sans-serif"> Link detected:
yes</font>
<br>
<br>
<br><font size=2><tt>>Typically, 10/Full is not correct. It very
well could be, but it's very<br>
>abnormal. You might want to verify that the switch is 10/Full
and not<br>
>10/Half.<br>
</tt></font>
<br><font size=2><tt>Dan<br>
</tt></font>
<br><font size=2><tt>On Fri, 2005-01-21 at 11:59 -0600, Brent M. Clements
wrote:<br>
> > The system is a web hosting server at a hosting provider plugged
into a<br>
> > cisco switch. It's set at 10Mb because of our purchased rate.<br>
> ><br>
> > -Brent<br>
> ><br>
> > On Fri, 21 Jan 2005, Mike Kercher wrote:<br>
> ><br>
> > > Are you plugged into a switch or a hub? I'd wonder
why your link speed is<br>
> > > 10Mb FD instead of 100Mb FD<br>
> > ><br>
> > > Mike<br>
> > ><br>
> > > We have a<br>
> > > e100: eth0: Intel(R) PRO/100 Network Connection<br>
> > > e100: eth0 NIC Link is Up 10 Mbps Full duplex<br>
> > ><br>
> > > And this is the driver info.<br>
> > ></tt></font><font size=2 face="sans-serif"><br>
<br>
<br>
<br>
Keith Deterling<br>
IMD Server Support (Dept. F6YY)<br>
IBM Global Services, NorthEast Region, Essex, Junction, VT<br>
<br>
deterlin@(protected)<br>
Tie-Line 8-446-3535<br>
External 802-769-3535<br>
Fax: (802)-769-4253 (T/L: 8-446-4253)<br>
</font>
<br><font size=2 face="Courier New">I am not able</font>
<br><font size=2 face="Courier New">to unfold, how this cautelous enterprise
of licensing can be</font>
<br><font size=2 face="Courier New">exempted from the number of vain and
impossible attempts. And he</font>
<br><font size=2 face="Courier New">who were pleasantly disposed could
not well avoid to liken it to</font>
<br><font size=2 face="Courier New">the exploit of that gallant man who
thought to pound up the crows</font>
<br><font size=2 face="Courier New">by shutting his park gate.</font>
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