HP Integrity Virtual Machines Release Notes Version A.03.50

7.15 Do Not Use TCP Software Packet Reassembly in IGSSN Driver
There have been problems with TCP Software Packet reassembly in the igssn driver in a guest
HP-UX image. For this release, do not enable it on a guest. By default, software packet reassembly
(known with acronyms as drv_pr for driver packet reassembly) is enabled in igssn in the guest.
To determine if drv_pr is enabled, an administrator can execute the following command:
lanadmin -x drv_pr ppa
where ppa is the Card instance # (Crd in#) from lanscan.
To manually disable drv_pr, and administrator can execute the following command:
lanadmin -X drv_pr_off ppa
To manually enable drv_pr, an administrator can execute the following command:
lanadmin -X drv_pr_on ppa
NOTE: These change are not carried over to subsequent reboots of the system. To maintain the
configuration over reboots of the guest, the administrator must edit the guest file, /etc/
rc.config.d/hpigssnconf.
For each igssn device that must have drv_pr disabled, you must construct a block of information
in the hpigssnconf file. For example, if your guest needed to have both lan0 and lan3 disable
drv_pr, you might have:
HP_IGSSN_INTERFACE_NAME[0]=lan0
HP_IGSSN_STATION_ADDRESS[0]=
HP_IGSSN_MTU[0]=
HP_IGSSN_DRV_PR[0]=0
HP_IGSSN_INTERFACE_NAME[3]=lan3
HP_IGSSN_STATION_ADDRESS[3]=
HP_IGSSN_MTU[3]=
HP_IGSSN_DRV_PR[3]=0
7.16 HP-UX 11i v3 Guest Might Fail to Configure AVIO Network Interfaces
Due to Lack of Memory Resources
If any HP-UX 11i v3 guest AVIO network interfaces are not claimed when the guest boots, you
can resolve this issue by giving the guest more memory, then rebooting it. If you encounter this
issue and need all the AVIO interfaces, use this kernel tunable command to work around this
issue:
kctune -B dma32_pool_size=8388608
Then reboot the guest.
7.17 Other Issues and Notes
The following list provides additional issues with the Integrity VM V3.5 release of which you
should be aware :
• If you modify the MAC address of an interface in the guest, the hpvmstatus command in
the VM Host does not display the current MAC address correctly. There is no fix or
workaround for this problem at this time.
• Just as with physical devices on a network, for communication to occur uninterrupted
between all stations on a LAN segment, the MTUs of all the systems on the LAN segment
58 Networking Information