HP Integrity Virtual Machines Release Notes Version A.03.50

mode). Before you stop APA, use the hpvmnet -h command to halt the vswitch. If you do not
halt the vswitch first, the hpvmnet command reports an incorrect MAC address for the vswitch.
7.7 VM Manager Does Not Display APA Link Aggregate LAN Device
If a VM host system has an APA link aggregate LAN device that is composed of one or more
APA link aggregate LAN devices, the VM Manager does not display this APA link aggregate as
a possible backing LAN device in the VM dialog. To create a vswitch with this APA link aggregate,
use hpvmnet CLI.
7.8 Do Not Run Applications that Set Network Devices into Promiscuous
Mode
Vswitches must not be connected to network devices that are set to promiscuous mode. Do not
run applications like tcpdump on the VM Host on interfaces that are used for virtual switches.
7.9 Guest and Host Communication
Checksum offloading (CKO) is not supported. On most of the physical interfaces that are not of
10 Gigabyte type, CKO is turned off by default. Consult your interface card documentation for
details.
Turning on CKO can cause host-to-guest connections as well as guest-to-host communication
over a VLAN to fail. If you are receiving failures with host-to-guest connections or guest-to-host
communication using a VLAN, ensure that the CKO is turned off in the host interface driver. If
that does not fix the problem, reboot the vswitch.
To turn off the CKO on the VM Host, identify the PPA of the network interface for the vswitch
using the hpvmnet command. For example:
# hpvmnet
Name Number State Mode PPA MAC Address IP Address
======== ====== ======= ========= ====== ============== ===============
localnet 21 Up Shared N/A N/A
vmlan0 22 Up Shared lan0 0x00306ea72c0d 15.13.114.205
vmlan4 23 Up Shared lan4 0x00127942fce3 192.1.2.205
vmlan900 24 Up Shared lan900 0x00306e39815a 192.1.4.205
Check the status of the transmit CKO using the following command:
# lanadmin -x cko 4
Hardware TCP/UDP (IPv4) transmit checksum offload is currently enabled.
Hardware TCP/UDP (IPv4) receive checksum offload is currently disabled.
In this example, the VLANs are configured over the vswitch vmlan4. This vswitch is created on
PPA 4 on the VM Host. To turn off CKO on PPA 4, enter the following command on the VM
Host:
# lanadmin send_cko_off 4
Hardware TCP/UDP (IPv4) transmit checksum offload is currently disabled.
7.10 Configuring vswitches to be Backed by a VLAN Interface on the VM
Host is Not Supported
Do not use the hpvmnet command to create a virtual switch backed by a VLAN port on the VM
Host. This configuration is not supported.
7.11 Do Not Turn on TSO on the VM Host and on HP-UX Guests
TCP Segmentation Offload (TSO) is turned off by default in HP-UX. HP recommends that you
leave it turned off on both the VM Host system and on HP-UX guests. This applies to both the
56 Networking Information