HP Integrity Virtual Machines 4.3: Installation, Configuration, Administration

# /sbin/rc2.d/S340net stop
# ch_rc -a -p "INTERFACE_NAME[0] = "lan3"
# /sbin/rc2.d/S340net start
The guest network begins to function.
7.5.2 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 VM 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
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
140 Creating Virtual Networks