HIPERSOCKETS Not Working

2011-01-31 Thread Brent Litster
Hello list.  We are attempting to route some Linux traffic over HiperSockets 
that we have defined.  The traffic flows in some directions but not all.  Here 
is part of an email from the mainframe networking folks the describes the 
problem...

We have hipersockets installed in all z/OS LPARS and in the z/VM LPAR.

We have also installed it in two z/Linux guests. (utlz0002 and utlz0003).

The z/OS LAPRS and the z/VM LPAR can now communicate to each other over the 
hipersocket links without errors.

The z/OS LAPRS and the z/VM LPAR cannot communicate with the z/Linux guests.
.
The z/Linux guests can communicate with each other over the hipersocket link.

The z/Linux guests can also communicate with the z/OS LAPRS and the z/VM LPAR 
over the hipersocket link.

Symptom:

A tcpdump from the z/Linux guest shows that a ping from a z/OS LPAR does arrive 
from the hipersocket link however no response to the ping was sent.

Any help would be appreciated.
Regards,
Brent Litster

Brent Litster
Zions Management Services Company
2185 South 3270 West
West Valley City  84119
(801) 844-5545
blits...@zionsbank.com

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Re: HIPERSOCKETS Not Working

2011-01-31 Thread Alan Altmark
On Monday, 01/31/2011 at 03:56 EST, Brent Litster 
brent.lits...@zionsbancorp.com wrote:
 A tcpdump from the z/Linux guest shows that a ping from a z/OS LPAR does 
arrive 
 from the hipersocket link however no response to the ping was sent.

The HiperSocket is working just fine, as demonstrated by your TCPDUMP. 
It's a routing problem.  It's ALWAYS a routing problem.  Look at the Linux 
guest's routing table to see where that packet is going.  Ensure that z/OS 
and the Linux guest are using the same subnet mask and MTU size on their 
HiperSocket connection.

When in doubt, draw your networks on a piece of paper and label them with 
IP addresses and subnet masks.  It will quickly become apparent if you've 
got your virtual wires crossed.

Alan Altmark

z/VM and Linux on System z Consultant
IBM System Lab Services and Training 
ibm.com/systems/services/labservices 
office: 607.429.3323
alan_altm...@us.ibm.com
IBM Endicott