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Subject: Why do I need to prevent looping when deploying CA gateway
From: "Wang, Lin" <wanglin@ihep.ac.cn>
To: Tech-talk@aps.anl.gov
Date: Mon, 24 Jul 2017 23:43:18 +0800 (GMT+08:00)
Dear all,

When I was deploying CA gateways for our facility recently according the users guide [1], I was confused about the motivation for preventing looping mentioned in the document. Does CA gateway looping affect anything? Will CA gateways work improperly when looping happens?

For example, when I create two CA gateways (gateway1 and gateway2) in one PC with eth0 and eth1 connecting to NetA and NetB respectively. Gateway1 binds eth0 as CA server IP and adds eth1/NetB to EPICS_CA_ADDR_LIST, whereas gateway2 binds eth1 as CA server IP and adds eth0/NetA to EPICS_CA_ADDR_LIST. This way, there is a loop and the internal PVs inside both gateway1 and gateway2 can be accessed from both NetA and NetB. However, I cannot see anything abnormal, the two CA gateways still work properly. Even if I capture UDP/TCP packets using Wireshark with cashark plugin, I still cannot see excessive packets. 

Any hints or answers are appreciated. Thanks.


Lin


[1] http://www.aps.anl.gov/epics/EpicsDocumentation/ExtensionsManuals/Gateway/Gateway.html

Replies:
Re: Why do I need to prevent looping when deploying CA gateway Andrew Johnson

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