topic IP Address problem with MC/SG in Operating System - HP-UX

IP Address problem with MC/SG

Luis Garcia_6 — Mon, 29 Nov 1999 09:39:35 GMT

We have a working cluster of two HP9000 K460 running HP-UX 10.20 and
MC/ServiceGuard A.10.11
Server A stationary IP address is 192.34.128.105 and server B is
192.34.128.106. The MC/SG package has its own relocatable IP address like
192.34.128.100 (this is the IP for the application)

Every cllient of the aplplication issues the call (via FTP) to the relocatable
IP, and this works fine.

However, when the cluster tries to reply (usign FTP), the server running the
package at that moment users its own stationary IP address to issue the call.
This is not recognized by the clients, and they reject the call.

is there a way to make FTP use the relocatable IP address instead of the
stationary address to make the call ?

Right now this has become a critical situation for my client.

Thanks in advance.

Re: IP Address problem with MC/SG

Neil Gast_1 — Mon, 29 Nov 1999 11:21:32 GMT

I am guessing from your description that you have one network card on each
server, and you're using it for both the static and the package IP. Correct?

The problem is this: HP allows more than one IP address to be assigned to one
network interface. When your server boots, it configures your interface with
the static IP specified in your netconf file. Then, when SG starts up, it
assigns a second IP to that interface for the package. When some utility, like
FTP, uses that interface from the server side, it places into the packet header
the first IP in the list of assigned addresses for that interface. When your
FTP client requests the package IP, and the server responds with the static IP
(the first in the list), problems occur, as you found out.

Unfortunately, there is no way to force FTP to use a specific IP address. It
will use the first IP address configured on the network interface.

Would it be possible to replace FTP with another tool, like rcp?

Recommendation: Get yourself another network interface on each server to
support ServiceGuard. Having a dedicated network interface for just your SG
packages is the safest way to go.

MrNeil

Re: IP Address problem with MC/SG

Anthony Goonetilleke_1 — Mon, 29 Nov 1999 14:51:20 GMT

I know your not going to like this answer :-)
But... We have a HP 11.0 system with MC/SG A.11.05 and guess which IP address I
get returned when I ftp to the floating IP bound to the package? The proper
floating IP and not the fixed machine one. Maybe the guru's at HP can verify
that a simple upgrade can solve your problem you might just need to upgrade
MC/SG and not the OS.

regards,
AG

Re: IP Address problem with MC/SG

Luis Garcia_6 — Mon, 29 Nov 1999 16:05:40 GMT

Hi, Anthony !

I wonder if you are trying to FTP the server with MC/SG running on it.

This works fine, however, have you tried to FTP from the server to another
server ?

If you've done so, and this works, then I guess I must upgrade to 11.0 !! :)

Thanks for your help !