HP Integrity Virtual Machines 4.2: Installation, Configuration, and Administration

# lanscan
Hardware Station Crd Hdw Net-Interface NM MAC HP-DLPI DLPI
Path Address In# State NamePPA ID Type Support Mjr#
0/0/5/0 0x02636C6E3030 1 UP lan3 snap3 1 ETHER Yes 119
In the preceding example, before the modification, the LAN PPA was 0. The new LAN PPA on
the first boot after the modification is 3. Therefore, you must first bring the guest network down,
then you must change the INTERFACE_NAME[0] from lan0 to lan3. You can then use /sbin/
rc2.d/S340net to restart the guest network. For example:
# /sbin/rc2.d/S340net stop
# ch_rc -a -p "INTERFACE_NAME[0] = "lan3"
# /sbin/rc2.d/S340net start
The guest network begins to function.
8.5.2 Troubleshooting VLAN Problems
When VLANs are configured on the vswitch, the partitioned LAN must have its own set of
network servers to service requests on the VLAN. For example, the VLAN's DNS server or a
router setup on the VLAN should be set up on the VLAN. If guests start slowly or hang during
starting, determine whether the guest network interface is on a VLAN, and whether the
appropriate network services (like DNS) are set up and available on the VLAN. You might need
to either set up the appropriate services on the VLAN, or disable some of these network services
on the guest before booting up the guest on a VLAN.
When VLANs are configured on the vswitch and the guests are required to communicate over
a VLAN with a remote node outside the VM Host, you might need to set up the physical network
appropriately for the VLAN. For information about configuring VLANs on the switches, see the
product documentation for the physical network adapters.
If TCP/UDP applications have trouble communicating between a guest and the local VM Host
over a VLAN, it is possible that the host interface for the vswitch is checksum-offload capable.
To resolve the problem, identify the interface used by the vswitch and run the following command
on the VM Host to disable the CKO feature, where 4 is the host interface as shown in the hpvmnet
command output.
# lanadmin -X send_cko_off 4
Hardware TCP/UDP (IPv4) transmit checksum offload is currently disabled
8.5.3 Troubleshooting VLAN-Backed vswitches
To enable the VLAN-backed vswitch (VBVsw) feature, PHNE_40215 patch is required to be
installed on the VM Host. This patch is available as an individual patch or as part of "FEATURE11i"
bundle. To verify that the patch is installed, enter the following:
# swlist -l product | grep PHNE_40215
PHNE_40215 1.0 LAN cumulative patch
The dlpi_max_ub_promisc kernel tunable needs to be set to 16 when using a VBVsw type
vswitch. Otherwise, attempting to boot the vswitch fails with the following error message from
the hpvmnet command:
# hpvmnet -b -S vs5000
hpvmnetd: setup_downlink: promisc failed, recv_ack:
promisc_phys: UNIX error - Device busy, errno 5
To set the kernel tunable, enter the following:
# kctune dlpi_max_ub_promisc=16
8.5 Troubleshooting Network Problems 139