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From: Hien <phanquochien@gmail.com>
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Subject: java/153150: [xen/ec2]disable checksum offloading on interface
	'xn0' and enable it immediately caused network hang
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>Number:         153150
>Category:       java
>Synopsis:       [xen/ec2]disable checksum offloading on interface 'xn0' and enable it immediately caused network hang
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    freebsd-java
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Dec 14 15:10:10 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator:     Hien
>Release:        FreeBSD 9.0-CURRENT
>Organization:
>Environment:
FreeBSD ip-10-122-163-59 9.0-CURRENT FreeBSD 9.0-CURRENT #68: Sun Dec 12 03:52:29 UTC 2010     root@chch.daemonology.net:/usr/obj/i386.i386/usr/src/sys/XEN  i386
Running on Amazon EC2(ami-c01aeca9)!
>Description:
While I'm testing FreeBSD 9.0-CURRENT on EC2 ! When I try disable checksum offloading on interface 'xn0' and enable it immediately by below command it caused network hang:

ifconfig xn0 -txcsum
ifconfig xn0 txcsum

Only network problem, everything is running (I used cronjob to test it)


>How-To-Repeat:
Disable checksum offloading on interface 'xn0' and enable it immediately
>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: