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

Subject: RE: dm and edm problems with CA gateway
From: "Kenneth Evans, Jr." <[email protected]>
To: "'Albert Kagarmanov'" <[email protected]>
Cc: "'tech_talk'" <[email protected]>
Date: Mon, 14 Mar 2005 13:40:59 -0600
 Albert,

     As a general rule, if you set EPICS_CA_ADDR_LIST, you should almost
always set EPICS_CA_AUTO_ADDR_LIST to NO.  In that case it will only do
searches to the addresses in EPICS_CA_ADDR_LIST, and you know what is
happening.  Otherwise, there is a good chance something unexpected and
undesired will happen, especially when there are multiple interfaces
involved.
  
     Similarly, if you do not set EPICS_CA_ADDR_LIST, you probably also want
to leave EPICS_CA_AUTO_ADDR_LIST unset which is equivalent to YES.  You then
search to all the available servers on the subnet, what you typically want
to do on the machine network (and why these are the default settings).

     With a Gateway, you typically do want to set EPICS_CA_ADDR_LIST (to the
Gateway address).  You typically don't want PVs from other servers.  If you
do, in my opinion it is better to set EPICS_CA_ADDR_LIST to a list of those
addresses you want to include and to set EPICS_CA_AUTO_ADDR_LIST to NO so
you don't get any extra ones.

     These are my "rules of thumb".  The full information is in the Channel
Access Reference Manual, of course.

	-Ken


References:
RE: dm and edm problems with CA gateway Albert Kagarmanov

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