Issue with PowerEdge 1850 network connectivity

JackHammer19 jackhammer19 at gmail.com
Mon May 1 07:30:06 CDT 2006


No, this is just a plain web server.  The network setup is simple: no VLANs,
no traffic shaping, no iproute settings, not even an iptables firewall.
eth0 connects to the internal network through a Dell 2708 switch running in
unmanaged mode, and eth1 connects to a Cisco 1720 router through a simple
unmanaged switch.

Thanks,

JH

On 4/30/06, David Hubbard <dhubbard at dino.hostasaurus.com> wrote:
>
> Are you using multiple vlans and tagging on any of the links
> so that when you add other machines into the mix a port goes
> active, causes a switch to start forwarding on a vlan it had
> been ignoring before and then you end up with a loop in your
> network without spanning tree?  Just an idea; since the problem
> doesn't occur until another machine is on the network, and
> the behavior you describe, make it sound like a spanning tree,
> vlan or other similar issue.
>
> David
>
> > -----Original Message-----
> > From: linux-poweredge-bounces at dell.com
> > [mailto:linux-poweredge-bounces at dell.com] On Behalf Of JackHammer19
> > Sent: Sunday, April 30, 2006 10:15 PM
> > To: linux-poweredge at dell.com
> > Subject: Issue with PowerEdge 1850 network connectivity
> >
> > I have a Dell PowerEdge 1850 web server with dual Intel PRO/1000
> > network interfaces built into the motherboard.  The operating
> > system is
> > CentOS 4.2 (identical to Red Hat Enterprise Linux AS 4.2 - built from
> > Red Hat sources).  I am running the latest kernel ( 2.6.9-34.ELsmp).
> > The lspci output reports the interfaces as Intel 82541GI/PI.
> >
> > The system has the latest patches applied.
> >
> > The e1000 driver information, as reported by modinfo, is:
> >
> > --------------------------------------------------------------
> > ---------------
> > $ /sbin/modinfo e1000
> > filename:
> > /lib/modules/2.6.9-34.ELsmp/kernel/drivers/net/e1000/e1000.ko
> > parm:           debug:Debug level (0=none,...,16=all)
> > version:        6.1.16-k3-NAPI 4BCC06D27AAC4C711223CC9
> > license:        GPL
> > description:    Intel(R) PRO/1000 Network Driver
> > author:         Intel Corporation, <linux.nics at intel.com>
> > parm:           InterruptThrottleRate:Interrupt Throttling Rate
> > parm:           RxAbsIntDelay:Receive Absolute Interrupt Delay
> > parm:           RxIntDelay:Receive Interrupt Delay
> > parm:           TxAbsIntDelay:Transmit Absolute Interrupt Delay
> > parm:           TxIntDelay:Transmit Interrupt Delay
> > parm:           XsumRX:Disable or enable Receive Checksum offload
> > parm:           FlowControl:Flow Control setting
> > parm:           AutoNeg:Advertised auto-negotiation setting
> > parm:           Duplex:Duplex setting
> > parm:           Speed:Speed setting
> > parm:           RxDescriptors:Number of receive descriptors
> > parm:           TxDescriptors:Number of transmit descriptors
> > alias:          pci:v00008086d000010B5sv*sd*bc*sc*i*
> > alias:          pci:v00008086d0000109Asv*sd*bc*sc*i*
> > alias:          pci:v00008086d00001099sv*sd*bc*sc*i*
> > alias:          pci:v00008086d0000108Csv*sd*bc*sc*i*
> > alias:          pci:v00008086d0000108Bsv*sd*bc*sc*i*
> > alias:          pci:v00008086d0000108Asv*sd*bc*sc*i*
> > alias:          pci:v00008086d0000107Fsv*sd*bc*sc*i*
> > alias:          pci:v00008086d0000107Esv*sd*bc*sc*i*
> > alias:          pci:v00008086d0000107Dsv*sd*bc*sc*i*
> > alias:          pci:v00008086d0000107Csv*sd*bc*sc*i*
> > alias:          pci:v00008086d0000107Bsv*sd*bc*sc*i*
> > alias:          pci:v00008086d0000107Asv*sd*bc*sc*i*
> > alias:          pci:v00008086d00001079sv*sd*bc*sc*i*
> > alias:          pci:v00008086d00001078sv*sd*bc*sc*i*
> > alias:          pci:v00008086d00001077sv*sd*bc*sc*i*
> > alias:          pci:v00008086d00001076sv*sd*bc*sc*i*
> > alias:          pci:v00008086d00001075sv*sd*bc*sc*i*
> > alias:          pci:v00008086d00001060sv*sd*bc*sc*i*
> > alias:          pci:v00008086d0000105Fsv*sd*bc*sc*i*
> > alias:          pci:v00008086d0000105Esv*sd*bc*sc*i*
> > alias:          pci:v00008086d00001028sv*sd*bc*sc*i*
> > alias:          pci:v00008086d00001027sv*sd*bc*sc*i*
> > alias:          pci:v00008086d00001026sv*sd*bc*sc*i*
> > alias:          pci:v00008086d0000101Esv*sd*bc*sc*i*
> > alias:          pci:v00008086d0000101Dsv*sd*bc*sc*i*
> > alias:          pci:v00008086d0000101Asv*sd*bc*sc*i*
> > alias:          pci:v00008086d00001019sv*sd*bc*sc*i*
> > alias:          pci:v00008086d00001018sv*sd*bc*sc*i*
> > alias:          pci:v00008086d00001017sv*sd*bc*sc*i*
> > alias:          pci:v00008086d00001016sv*sd*bc*sc*i*
> > alias:          pci:v00008086d00001015sv*sd*bc*sc*i*
> > alias:          pci:v00008086d00001014sv*sd*bc*sc*i*
> > alias:          pci:v00008086d00001013sv*sd*bc*sc*i*
> > alias:          pci:v00008086d00001012sv*sd*bc*sc*i*
> > alias:          pci:v00008086d00001011sv*sd*bc*sc*i*
> > alias:          pci:v00008086d00001010sv*sd*bc*sc*i*
> > alias:          pci:v00008086d0000100Fsv*sd*bc*sc*i*
> > alias:          pci:v00008086d0000100Esv*sd*bc*sc*i*
> > alias:          pci:v00008086d0000100Dsv*sd*bc*sc*i*
> > alias:          pci:v00008086d0000100Csv*sd*bc*sc*i*
> > alias:          pci:v00008086d00001009sv*sd*bc*sc*i*
> > alias:          pci:v00008086d00001008sv*sd*bc*sc*i*
> > alias:          pci:v00008086d00001004sv*sd*bc*sc*i*
> > alias:          pci:v00008086d00001001sv*sd*bc*sc*i*
> > alias:          pci:v00008086d00001000sv*sd*bc*sc*i*
> > depends:
> > vermagic:       2.6.9-34.ELsmp SMP gcc-3.4
> > --------------------------------------------------------------
> > ---------
> >
> > The internal Ethernet interface is connected to a Dell 2708 Gigabit
> > switch which has two other hosts with gigabit interfaces
> > attached, one
> > host with a 100 Mbps full duplex LAN card and an uplink to a 3Com
> > SuperStack3 10/100 Mbps full duplex switch.
> >
> > The external interface connects to another 3Com SuperStack3
> > 10/100 Mbps
> > full duplex switch which also has a Cisco 1720 router
> > attached through a
> > 100 Mbps full duplex interface.  The Cisco 1720's external serial
> > interface connects to a MCI T1 line that provides internet
> > connectivity
> > to the web server.  The server's default route is set to the
> > T1 gateway.
> > The 3Com switch also has another Cisco 827 router connected to it on
> > another totally different IP subnet, which provides Internet
> > connectivity to a different set of hosts.
> >
> > The PE 1850 runs smoothly when it is the only host connected to the
> > Cisco router/ T1 line.  However, when I attach another host to the
> > Cisco router/ T1 line, the web server exhibits huge delays in
> > serving web pages.
> > The internal interface is unaffected.  However external
> > clients experience huge delays
> > and frequent timeouts and CGI processes accumulate on the web server,
> > increasing server load till it eventually crashes.
> >
> > I have tried several methods of fixing this, including moving the T1
> > line to a separate Cisco Catalyst 1900 switch, changing the router (I
> > first had a Cisco 1605R installed with a 10 Mbps half duplex
> > port which
> > was then upgraded to a Cisco 1720 with a 100 Mbps full duplex
> > port) etc.
> > I next tried adjusting the e1000 driver settings for the external
> > interface (eth1) including the following:
> >
> > * Interrupt Throttle Rate set to figures between 3000 to 7000
> > * Interrupt Throttle Rate set to 70,000
> > * Interrupt Throttle Rate turned off (0)
> > * Tx and Rx delays and absolute delays set to 0
> > * TCP segment offload turned off
> >
> > in various combinations.  Nothing seems to work though, with the web
> > server seizing up whenever another host is attached.  I still seem to
> > be able to ping out to the world when logged into the affected system
> > through the affected external interface though.
> >
> > Any advice or suggestions would be welcome.
> >
> > TIA,
> >
> > JH
> >
> >
> >
>
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