Hi,
Our network folks noticed that one of our zLinux systems is driving a lot
of packet retransmissions, caused mainly because packets are being received
out-of-sequence, outside the target workstation's response window (I hope
I'm getting the terminology correct here).
Going one step further,
-Original Message-
From: The IBM z/VM Operating System
[mailto:[EMAIL PROTECTED] On Behalf Of Dennis Schaffer
Sent: Wednesday, August 02, 2006 12:27 PM
To: IBMVM@LISTSERV.UARK.EDU
Subject: VM TCP/IP Routing Question
Hi,
Our network folks noticed that one of our zLinux
Dennis,
When more than one path to a destination
exists, and they have the same cost (as defined by the routing
protocol), z/VM TCP/IP will round robin packets to that destination through
the available paths. For static routing, this behavior is controlled
by the EQUALCOSTMULTIPATH parameter on
On Wednesday, 08/02/2006 at 12:26 EST, Dennis Schaffer
[EMAIL PROTECTED] wrote:
Our network folks noticed that one of our zLinux systems is driving a
lot
of packet retransmissions, caused mainly because packets are being
received
out-of-sequence, outside the target workstation's response
Alan Altmark wrote on 08/02/2006 01:02:34 PM:
You need to get the Linux guests directly on the VSWITCH and get out of
the virtual router business. The VSWITCH will be responsible for
managing
OSA redundancy at a physical level rather than an IP routing level.
Alan,
Thanks for your response.
John/Miguel,
Thanks for your responses. EqualCostMultiPath seems to be exactly what's
causing this behavior.
In theory, it seems EqualCostMultiPath would be ideal behavior to
load-balance network traffic between the adapters, which seems like a good
thing. However, I hadn't considered the
On Wednesday, 08/02/2006 at 02:11 EST, Dennis Schaffer
[EMAIL PROTECTED] wrote:
Please understand that each of my OSA adapters are connected to
different
IP subnets (because, my network folks say, that provides optimum
redundancy: completely different network hardware, from the OSA to the
Miguel Delapaz wrote on 08/02/2006 01:00:40 PM:
Dennis,
When more than one path to a destination exists, and they have the
same cost (as defined by the routing protocol), z/VM TCP/IP will
round robin packets to that destination through the available paths.
For static routing, this behavior
Would a direct VSWITCH connection to the zLinux server (running RHEL AS 4)
be more flexible in this area? In other words, is the Linux TCP/IP stack
(w/ Zebra/OSPF) be more flexible? Miguel, I don't really expect you to
answer this part of the question because you're not supposed to be a
this message. Thank you for your cooperation.
-Original Message-
From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On
Behalf Of Alan Altmark
Sent: Wednesday, August 02, 2006 13:46
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: [IBMVM] VM TCP/IP Routing Question
On Wednesday, 08/02
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