Category Archives: Networking

iLO 3 Shared Network Port limitation

09/06/2011 – 11:36

It is very common to have port shortage in a datacenter, so a dedicated management port isn’t always a doable solution. There is some good news for iLO users: from version 1.60 onwards, iLO is able to use the system NIC for management purposes. You can set it in the following menu: As you can [...]

By Viktor Balogh | Also posted in Hardware, Servers | Tagged , , , , , , , , | Comments (2)

Setting system initial parameters

21/03/2011 – 12:44

This is a quick reminder on how to set system initial parameters like hostname, root password and networking. This routine runs directly at install time, right after the first boot and gives the newly created system all the required settings. It can come handy if you have just installed a VM (HP IVM) and have [...]

By Viktor Balogh | Also posted in HP-UX system administration, Virtualization | Tagged , , , , , , , | Comments (0)

Real-time ethernet bandwidth utilisation

04/12/2010 – 13:40

Some weeks ago one of my colleagues asked me how could he monitor the traffic rate of the ethernet network. There is the netperf tool which you can get from the porting center, however that is more of a network troubleshooter tool than a real-time monitoring software. Now I found a nice perl script which [...]

By Viktor Balogh | Also posted in HP-UX system administration, Languages and Scripting, Monitoring | Tagged , , , , , , , | Comments (1)

How autonegotiation supposed to work

06/01/2010 – 14:15

Here is a quick guide on how autonegotiation supposed to work: When both sides are set to autonegotiation, they will negotiate the speed and the duplexity and the maximum supported will be the common speed/duplexity. If one side is hardcoded and the autonegotiation is set to off, the autonegotiation process will fail, and the side [...]

By Viktor Balogh | Tagged , , , , | Comments (0)

Listing used tty’s/pty’s on HP-UX

01/10/2009 – 17:56

There is a system where our customer had the following error messages: … APTY Trying to allocate /dev/ptyr7 APTY Trying to allocate /dev/ptyr8 APTY Trying to allocate /dev/ptyr9 … The background is, that it is a custom application, which is used from ServiceGuard on a two-node cluster. I guess it is around ~15 years old. [...]

By Viktor Balogh | Also posted in HP-UX system administration | Tagged , , , , , , , | Comments (2)

Firewall in HP-UX

20/08/2009 – 15:29

In most datacenters it is very uncommon to use a firewall directly on the server. However, in HP-UX it is on as a default. To check the status of the firewall: # ipfstat dropped packets:        in 0    out 0 non-data packets:       in 0    out 0 no-data packets:        in 0    out 0 non-ip packets:         in 0    [...]

By Viktor Balogh | Also posted in HP-UX, HP-UX general, Security | Tagged , , , | Comments (7)

Permanent LAN settings howto

27/06/2009 – 16:03

This is a short howto on how to preserve the speed, duplexity and MAC settings for a network interface on HP-UX to survive a reboot. First, list the network interfaces with ioscan! # ioscan -fknC lan Class     I  H/W Path     Driver   S/W State   H/W Type     Description ======================================================================== lan       0  0/1/2/0      igelan   CLAIMED     INTERFACE    HP PCI [...]

By Viktor Balogh | Also posted in HP-UX system administration | Tagged , , , | Comments (2)

Interrupting unreachable NFS at boot

26/06/2009 – 19:54

If the NFS server hangs and we realized it only after booting our NFS client, we will be presented with a boot message like this: Start NIS server subsystem …………………………………… OK Start ldap client daemon …………………………………….. N/A Start NIS/LDAP server subsystem ………………………………. N/A Start NIS client subsystem …………………………………… OK Start NFS client subsystem …………………………………… NFS [...]

By Viktor Balogh | Also posted in HP-UX system administration | Tagged , , | Comments (6)