Some Questions about Cyrus Agregattion ( Murder )

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I have some questions about a possible Cyrus Agregation ( Murder )
implementation  in  my enviromment.


My envirommet;

----------------------------------------------
- Internet Firewall

--  3 Cyrus FrontEnd ( DMZ )

- Internal DMZ Firewall

-- 3 Backends + 1 Mupdate.

-------------------------------------------------------------------------------------------------------


In this situation, backends have only a NAT IP.


I think that  "IMAP Referral"  is not a option in this case.

I find a parameter to imapd.conf:  proxyd_disable_mailbox_referrals.
Only this parameter is necessary in frontend  to complete disable referall  ?


----------------------

The worst operation for a firewall is the  operation to open a connection.

Is possible to force the frontends to keep the connectiom  with
MUPDATE and Backends ?
Like a tcp keepalive.


Regards
Zinato
----
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