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<== Date ==> <== Thread ==>

Subject: Re: EPICS_CA_ADDR_LIST in R3.12Beta13CEBAF
From: hill@luke.atdiv.lanl.gov (Jeff Hill)
To: yamamoto@acsad1.kek.jp, tech-talk@aps.anl.gov
Cc: johill@lanl.gov
Date: Mon, 17 Jul 95 09:43:18 MDT
>  Does anyone use EPICS_CA_ADDR_LIST environment variable in R3.12Beta13?
> I installed R3.12.0Beta13CEBAF on our HP-WS. ca_test cannot find a channel 
> on IOC. The older version of ca_test , which also uses EPICS_CA_ADDR_LIST
> variable , can find the channel. In our configuration, IOC's and OPI's 
> belong differenct sub-nets and channel search by bradcast will not work.
> 

A known problem with R3.12.0Beta13 occurs when all of the following 
are true. 
o The server receives a channel name resolution (search) UDP request 
	from off subnet 
o There isnt a route in vxWorks to the sender of this request 

In this situation the UDP task discovers the error and suspends itself 
rather than continuing to service requests as it should. 

Symptoms:
o No route to destination message on the IOC's console and in the log file.
o Suspended CA UDP task in the IOC.
o IOC's CA server stops receiving new connections.

Work Around
o Add a default route to your IOC:
	hostAdd "myrouter", "N.N.N.N"
	routeAdd "0", "myrouter"
	Type "netstat -r" on a UNIX host to determine the 
		address of a router.

We have known about this problem for awhile but have been discouraged from
checking a patch into CVS until an official release of R3.12.1 occurred. 

I suggest that APS create a CVS branch so that fixes of this nature can 
be applied to R3.12.2 (while future EPICS development continues on the
main CVS branch).

Otherwise there are no known problems with the use of EPICS_CA_ADDR_LIST.

Jeff

______________________________________________________________________
Jeffrey O. Hill			Internet	johill@lanl.gov
LANL MS H820			Voice		505 665 1831
Los Alamos, NM 87545 USA 	FAX		505 665 5107


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