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Date: Tue, 18 Oct 2005 12:46:23 -0500 (EST)
To: isis-support@imagestream.com
Subject: Enterprise Linux Version 4.2.6 for routers available

Version 4.2.6 of ImageStream's Enterprise Linux is now available as a general
availability (GA) release for all ImageStream router customers.

This software release is provided at no charge to all ImageStream customers.
Version 4.2.6 is a maintenance release and recommended for all customers who
wish to run the latest GA release.

This release note documents commands and features added between Version 4.2.5
and Version 4.2.6, including features added in all Version 4.2.6 beta releases.


New Features in Version 4.2.6

System Log (syslog) Supports Remote Facility Logging

ImageStream's syslog daemon in 4.2.6 includes the option to log to a specific
remote facility.  Previous versions supported remote logging, but only to
the default facility.

L2TP Support Added to SAND

The version of SAND included in Enterprise Linux Version 4.2.6 supports
L2TP tunnels.  Enterprise Linux's LT2P support includes the ability to set
virtual templates for DSL and other aggregation configurations that deliver
individual user sessions over an L2TP tunnel to the router.

bwinit/bwadd Quality of Service Utility Updated

ImageStream's bwinit/bwadd Quality of Service utility now includes the ability
to set a root class handle.  The "--classhandle" directive allows users to
configure multiple class hierarchies for ease of configuration in multi-class
Quality of Service environments.

Performance Enhancements Added To SNMP

The version of the SNMP included in Version 4.2.6 adds new device lookup
algorithms that allows the SNMP service to respond more quickly on routers
with large numbers of interfaces.  The change also helps SNMP withstand more
DoS conditions than in previous releases.

Ping Utility Supports Alternate Source Addresses

The ping utility included with Enterprise Linux 4.2.6 includes support for
alternate source addresses using the "-I" flag.  Previous versions did not
support this option.

Quagga (Zebra), SNMP SMUX Beta Support Added

The versions of SNMP and Quagga (Zebra) in 4.2.6 include support for SMUX.
SMUX enables Quagga to communicate dynamic routing information via SNMP.
This option is included as an unsupported beta for Version 4.2.6.

SNMP Package Updated

The Net-SNMP package included with Version 4.2.6 has been upgraded to version
5.2.1.  This version includes full support for the router's hardware sensors.
When the sensors package is loaded at boot time, users may access all of the
available hardware sensors by SNMP.

Time Zone Utility Supports Daylight Saving Time

The router's utility to set the system time now prompts users for daylight saving
time.  Previous versions required users to set daylight saving time manually,
if used in the locale.

Multilink PPP Supports Interleaving

Previous versions of SAND did not support interleaved packets on multilink PPP
devices.  Prior to Version 4.2.6, connecting a multilink PPP bundle to another
router with interleaving enabled caused the multilink bundle to drop.  Version
4.2.6 supports interleaved and fragmented packets on multilink bundles.

Annex G X.25 Over Frame Relay Support Added

The version of SAND included with Version 4.2.6 supports "raw" frame relay
encapsulations.  The raw mode adds only a 2-byte header to the packet on a
subinterface (DLCI).  Raw mode enables support for protocols such as Annex
G X.25.

SAND Ports Can Be Linked

Version 4.2.6 contains a version of SAND that adds the "link" command.  Adding
the command "link X" where X is an interface name connects two SAND ports directly.
All packets received on one port will automatically be transmitted by SAND out
the other linked port.  Linked ports do NOT have to use the same encapsulation,
port speed or type of card.  Any SAND port may be linked with any other SAND port.

Bridging Over Cisco HDLC Encapsulated Links Supported

Version 4.2.6 adds support for bridging over Cisco HDLC encapsulated Serial devices.
Previous versions only supported bridging over PPP, frame relay and Raw IP
encapsulated links.

OpenSSL and zlib Potential Vulnerabilities Patched

Version 4.2.6 includes the latest versions of the OpenSSL and zlib libraries that
patch potential vulnerabilities.  The vulnerabilities do not affect ImageStream
routers, but are patched in 4.2.6 as a precaution.

The following bugs have been fixed in Version 4.2.6:

bwinit/bwadd Quality of Service Utility Ceiling Ignored

Version 4.2.4 and 4.2.5 incorrectly added user-defined classes directly to the
main root class.  This behavior caused the router to ignore traffic ceiling
settings and allocate only the minimum specified bandwidth for each class.
Version 4.2.6 correctly adds user-defined classes to the proper parent class.

530 Series DS3/E3 Cards Can Panic Under Heavy Transmit Loads

Version 4.2.6 fixes a driver problem with the 530 series DS3/E3 cards.  In
previous 4.2 releases, the 530 series DS3/E3 cards could periodically encounter
a panic condition with heavily loaded transmit queues.  Version 4.2.6 corrects
the queue problem that causes this error.

SoftATM PVCs Stop Transmitting Under Specific Conditions

Version 4.2.6 fixes several related driver problems with interfaces that support
SoftATM for T1 and E1.  Previous versions would periodically stop transmitting
with a "NULL token" error.  Version 4.2.6 correctly recovers from this behavior, 
and adds additional debugging messages to report similar conditions.

VRRP Reload Issue Corrected

Previous Version 4.2 releases included a limitation preventing VRRP IDs from being
reloaded properly.  VRRP IDs changed and reloaded in previous releases would fail
to implement changes unless first removed and readded.  Version 4.2.6 corrects this
reload issue and fully supports reloading VRRP IDs.

Quagga (Zebra) Fails To Monitor Link States

Quagga (Zebra) versions in earlier Enterprise Linux releases did not process link
state changes based on the carrier on/off flag used by other services.  Version
4.2.6 now sends a NETDEV_CHANGE message to the kernel signaling Quagga to change
link states accordingly.