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

Troubleshooting
Diagnostic Flowcharts
Chapter 4
70
ifconfig lan1 192.6.1.17 netmask 255.255.255.0 up
Next, enter ifconfig interface to test and verify flag setting is UP and correct IP
address is displayed. For example:
ifconfig lan1
<UP,BROADCAST,RUNNING,MULTICAST,CKO>
• If the IP and flags are correct, verify there is an entry for the card interface in
/etc/rc.config.d/netconf. If so, go to Network Level Tests (Flowchart 3).
Otherwise, add the correct interface parameters to /etc/rc.config.d/netconf
file and reboot. If the flags are incorrect, correct them with ifconfig and repeat
this test. Otherwise, if ifconfig is not successful and error messages appear, correct
them accordingly and repeat this test.
• If you cannot correct the errors, call your HP representative.
Network Level Test for Jumbo Frames (Gigabit Ethernet only)
If you are using any of the Fast Ethernet cards, you may ignore this section. Jumbo
Frames only apply to Gigabit Ethernet.
Test Procedure
Within a LAN (that is, not across a router or layer 3), MTUs of all the end stations must
be set equal to each other, and greater than or equal to 1500. You can verify this using
the lanadmin -m administrative command (on HP-UX systems). The MTU for bridges
and layer 2 switches in the LAN must be set to the MTU value of the end stations, or
more. To test for Jumbo Frames, follow these steps:
1. Ensure that the MTU of all end stations is greater than, or equal to, 1500.
2. Check the IP level connectivity by using the ping(1M) command with a message size
greater than 1480. For example:
ping 192.6.20.2 2000
3. If there is a response to the ping command, Jumbo Frames is configured correctly.