Ethernet Support Guide (for HP-UX 11i v1, 11i v2)

Installation and Configuration
Installation and Configuration
Chapter 2
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• use the GUI-based system admin manager (SAM).
To use SAM, type sam at the HP-UX system prompt; then double-click
Networking and Communications. Verify the MTU size by performing the next
step (step 4); or
edit the gigabit ethernet driver configuration file using an editor such as “vi.”
Depending on which driver your La card uses, it can be any one of the following
Gigabit Ethernet configuration files:
— /etc/rc.config.d/hpietherconf
— /etc/rc.config.d/hpigelanconf
— /etc/rc.config.d/hpgelanconf
Depending on which driver your La card uses, set the mtusize by editing
HP_IETHER_MTU[0]= mtusize , HP_IGELAN_MTU[0]= mtusize , or
HP_GELAN_MTU[0]= mtusize
Depending on which driver your La card uses, insert the proper interface name:
HP_IETHER_INTERFACE_NAME, HP_IGELAN_INTERFACE_NAME, or
HP_GELAN_INTERFACE_NAME. When the system reboots, the interface will
be configured for jumbo frame operation.
4. Verify MTU change by entering netstat -rn. If MTU has not changed, enter the
following commands:
$ifconfig lan PPA_number unplumb
$ifconfig lan
PPA_number ip_address netmask netmask up
5. To check (or verify) the current Ethernet frame size, enter:
$lanadmin -m PPA_number
An alternative way to temporarily** configure jumbo frame size is to enter:
lanadmin -M mtu_size PPA_number .
The PPA_number is the one we obtained from the output of lanscan. For the iether
Gigabit Ethernet driver, for example, the MTU value must be a value between 1501 and
9000 (for Jumbo Frames).
**Note: using lanadmin will not preserve your settings across reboots.