point to point ip

[CAS_2]

Hi.

In my box 'ifconfig lan0:9' shows:

lan0:9: flags=1852
inet 192.168.150.61 --> 255.255.255.224 netmask ffffff00 broadcast 192.168.150.255

The first I found strange is the symbol "-->". Then I realized that it is a point-to-point connection.

I don't know how it is configured. No reference in /etc/rc.config.d/netconf file. (This box is rebooted in Nov 11th, 2004. I arrived to this company some months later... I mean I didn't configure that connection).

This box is running a SG cluster but no package contains that IP address.

Manual pages of ifconfig command shows nothing about point-to-point configuration.

1) Where are usually configured these P2P connections ?

2) I never dealed this type of connections before, so ... how does they work ? What does '-->' symbol mean ?

P.D: The 'netstat -in' command shows now that this IP is failed (don't worry).

[Mel Burslan]

Together with not being sure why such a construct existed on a serviceguard cluster, I have a faint feeling of someone at one time might have tried to implement the heartbeat lan without knowing what they were getting themselves into.

Or another idea, if this is a SAP cluster, they might have wanted to run SAP router process for SAP AG external support over dial-up networking.

These are the two things that come to mind in the light of what you said. How it is done is a total mystery to me but I remembered reading about it. Googling it yielded these pages with some traces of information regarding PPPoE on hpux:

http://www.informatik.uni-frankfurt.de/doc/man/hpux/ifconfig.1m.html
search for "ipdst" string and there is a trace of ppp mentioned

http://h20293.www2.hp.com/portal/swdepot/displayProductInfo.do?productNumber=TOUR
also, I believe this is how PPPoE gets enabled on hpux systems. Not sure though

and last but not the least, you may want to peek at this whitepaper:
http://docs.hp.com/en/5093/pppoe-whitepaper-draft-tour2.pdf

HTH

[Ermin Borovac]

This is usually a result of someone forgetting to specify netmask keyword to ifconfig.

CORRECT

# ifconfig lan0:9 192.168.150.61 netmask 255.255.255.224

INCORRECT (this will create point to point link from 192.68.150.61 to 255.255.255.224)

# ifconfig lan0:9 192.68.150.61 255.255.255.224

Run the following to unconfigure the interface

# ifconfig lan0:9 0.0.0.0