Rich,
We also tried various combinations of full/half duplex settings at
100mbps.
James
On Fri, 1 Jun 2001, Walker Traylor wrote:
> Rick,
> I guess I was a bit unclear with the type of hub/switch we used. We've
> tried several combinations, including a Cisco Catalyst 2924 switch for
> both segments. If I remember correctly, we forced the speed down by
> changing the speed on the switch side.
>
> Hmm...
>
> Thanks,
> --Walker
>
> On Fri, 1 Jun 2001, Rick Blake wrote:
>
> > I betcha a small cup of coffee that at 100MB you're either
> > auto-negotiating, or something is forcing full duplex. Go to your switch
> > and force half-duplex, or do it on the NICs. Poor performance at 100MB
> > with good performance at 10MB is a dead giveaway of duplexing mismatches.
> >
> > If you're using a hub, *it* cannot accept full duplex by
> > standard. Forcing the NIC to full duplex should be impossible to a hub.
> >
> > Rick
> >
> >
> > On Fri, 1 Jun 2001, Walker Traylor wrote:
> >
> > > Guys,
> > > I'm experiencing a routing performance problem in the following
> > > scenario:
> > >
> > > I've got a linux firewall running ip masquerading between my PC and DSL
> > > connection like so:
> > >
> > > eth eth
> > > PC-------linux f/w----------dsl modem---Inet
> > >
> > >
> > > Download throughput (FTP) maxes out the DSL connection when downloading
> > > from the Internet to either the linux f/w or to the PC, which is good.
> > > Uploading directly from the linux f/w to some box on the Internet occurs
> > > at full throughput, which is good. The problem is that the PC only
> > > uploads at about half the possible throughput if the ethernet segment
> > > between the PC and the linux f/w is at 100Mbps. If it is forced down to
> > > 10Mbs, downloads occur at full throughput! The speed of the ethernet
> > > segment between the f/w and the dsl modem does not seem to affect
> > > anything.
> > > No frame drops are reported via ifconfig on the f/w, nor on the dsl
> > > modem. This has been tested with multiple ethernet cards on the f/w and
> > > PC, including 3com cards, Intel cards (using e100 and eepro100 drivers), a
> > > card using tulip drivers, and a card using via-rhine drivers. The end PC
> > > may be either a linux or Windows box (both exhibit the same behavior.)
> > > This behavior is exhibited on a Redhat 7.0 box using several version of
> > > 2.2.x kernel ( all were somewhere between 2.2.14 - 2.2.18.) This behavior
> > > also is exhibited on a Redhat 7.1 box running the stock 2.4.2-2 kernel
> > > using the ipchains compatibility module.
> > >
> > > What gives? I've seen a few old thread with similar problems (they can be
> > > dug up if someone needs them) but nobody ever has a response.
> > >
> > >
> > > Thanks,
> > > --Walker
> > >
> > >
> > >
> > > -
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> > >
> >
> > -
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> >
>
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This archive was generated by hypermail 2b29 : Thu Jun 07 2001 - 21:01:14 EST