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Date: Fri, 14 Mar 2003 18:29:33 -0500 (EST)
From: ImageStream Support
Subject: (SUPPORT) Enterprise Linux 4.1.3 for routers available

Version 4.1.3 of ImageStream's Enterprise Linux is now available as an general
availability (GA) release for all ImageStream router customers.

This software release is provided at no charge to all ImageStream customers.
Version 4.1.3 is recommended for all customers, and is highly recommended for   
all customers who wish to upgrade to the latest available software release.
Version 4.1.3 provides significant stability increases for older WAN interfaces
over previous releases.


Version 4.1.2 was a closed beta release and will not be released publicly. This 
release note documents commands and features added between Version 4.1.1 and   
Version 4.1.3.


New Features in Version 4.1.3

Ethernet Transceiver Setup Integrated Into Interface Configuration File   

Version 4.1.3 removes the separate Ethernet transceiver configuration service   
and replaces it with "duplex" and "speed" commands for 10/100 Ethernet cards in
the network interface configuration file (wan.conf).  All 10/100 Ethernet cards,
including integrated ports, may be configured with the new interface commands.
Valid settings include 10 or 100 Mbps, full- or half-duplex and forced or
automatically negotiated configurations.  The previous Ethernet transceiver
configuration service is still available for backwards compatibility.

Support for CIPE Tunnels Added

Version 4.1.3 adds support for CIPE tunnels.  These encrypted tunnels may be
configured directly in the network interface configuration file (wan.conf).  A
"gencipekey"  utility has been added to Version 4.1.3 to generate 128-bit MD5
keys for use as CIPE secrets. A chapter on Configuring IP Tunnels has been added
to the Router Installation Manual.

GateD Recognizes Point-to-Point Interfaces

As of Version 4.1.3, GateD will recognize point-to-point interfaces, such as
tunnels. This allows tunnels and other point-to-point interfaces to be used as a
part of dynamic routing configurations.

Beta Support For Multicast Tunneling

Version 4.1.3 adds beta support for multicasting over unicast tunnels.  Using
this feature enables multicast networks and device to communicate over encrypted
and non-encrypted IP tunnels.  Support for this feature is BETA ONLY.  A fully
integrated configuration and extended compliance testing will be completed prior
to full release in a future version. Customers requiring this functionality   
should contact ImageStream Support by e-mail at support@imagestream.com for   
further guidance.

Protocol Subinterface Performance Improved

Version 4.1.3 includes a rewrite of the protocol subinterface queueing scheme.
Protocol subinterfaces now queue packets to the master device instead of
transmitting directly to hardware.  This elminates timeouts under load or with
large numbers of subinterfaces. Bandwidth limiting routines handle the new
protocol subinterface queueing scheme directly to improve performance and add
automatic bandwidth limits based on configuration.  Moving bandwidth limiting to
the protocol subinterface level reduces CPU usage.

Bugs fixed in Version 4.1.3

The following bugs have been fixed in Version 4.1.3:

HDLC Protocol Instability With 520 Series WAN Interface Cards Fixed

Version 4.1.3 fixes a bug in SAND that causes the HDLC protocol to go down
periodically, requiring a card reset to restore service to the port.  This code
problem would cause the transmit queue to become "stuck" and generate timeout
errors.  Version 4.1.3 corrects this issue.

Instability Under Load With 500, 520 and 720 Series WAN Interface Cards Fixed   

Under previous Version 4.1 releases, routers running 500, 520 or 720 series   
cards could lock up under specific conditions.  Version 4.1.3 adds additional
safeguards to prevent the underflow and overflow conditions with the 500, 520
and 720 Series cards' on-board chipsets.  Additional logging information has
been added for 520 series cards to properly detect and report FIFO buffer

Tigon-2 Chipset Gigabit Ethernet Card Initialization Problem Corrected

Previous Version 4.1 releases would not properly initialize Tigon-2 based
Gigabit Ethernet chipset cards due to a timer granularity problem.  The timer   
intervals used in earlier Version 4.1 releases were too small for use with the
Tigon-2 chipset.  This bug only affects Tigon-2 based Gigabit Ethernet boards,
which have been discontinued but are still in use in the field.

Tigon-3 Hardware Checksum Calculation Disabled

Version 4.1.3 disables hardware checksum calculation with Tigon-3 based Gigabit
Ethernet boards. Due to a chipset bug, Tigon-3 based boards would generate
errored checksums periodically, causing packet loss and potential lock ups of
the Ethernet port.  Version 4.1.3 computes TCP/IP checksums in software to avoid
this problem.

VLAN Packet Drop On On-Board Ethernet Devices Fixed

Under Version 4.1.1, VLANs configured on on-board Ethernet devices would drop
packets of sizes between 1468 and 1500 bytes due to a checksum error.  Version
4.1.3 fixes this behavior, allowing VLANs to operate normally with all packet
sizes on on-board Ethernet ports.

ATM PVC Initialization Problem Corrected

Version 4.1.3 corrects a problem initializing VPI/VCI pairs on 1000 series
cards.  In previous Version 4.1 releases, certain combinations of VPI/VCI pairs
on multiple subinterfaces caused an overflow condition resulting in invalid
initialization of the ATM SAR and PHY.  Version 4.1.3 corrects this condition by
correctly sizing the array used to program the ATM SAR and PHY based on the
highest order VPI/VCI pair.

Various Aesthetic Changes To Menus

Version 4.1.3 adds the distribution version number to the header of all menus
for easy reference. The Ethernet transceiver service menu has been removed.