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https://issues.apache.org/jira/browse/CLOUDSTACK-10010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16095256#comment-16095256
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Will Stevens commented on CLOUDSTACK-10010:
-------------------------------------------
Work in progress of a fix for this is here:
https://github.com/apache/cloudstack/pull/2190
> Some S2S VPN configurations fail to establish a connection
> ----------------------------------------------------------
>
> Key: CLOUDSTACK-10010
> URL: https://issues.apache.org/jira/browse/CLOUDSTACK-10010
> Project: CloudStack
> Issue Type: Bug
> Security Level: Public(Anyone can view this level - this is the
> default.)
> Components: Virtual Router
> Affects Versions: 4.10.0.0
> Reporter: Will Stevens
>
> I am not sure if a regression was introduced with this PR #2062, but we have
> found issues with this configuration now that we have it in production.
> The core of this change is to change the S2S VPN config from {{auto=start}}
> to {{auto=route}}. Read more about this setting here:
> https://wiki.strongswan.org/projects/strongswan/wiki/ConnSection
> We found there to be issues when using {{auto=start}} for both sides of the
> connection as there was problem negotiating the connection. Instead the
> {{auto=route}} config will only establish a connection once there is an
> attempt to send traffic over the connection. In order to attempt to open the
> connection as soon as the VPN connection is configured, a ping to the other
> side of the connection has been added to establish the connection.
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