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https://issues.apache.org/jira/browse/CLOUDSTACK-9552?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wido den Hollander closed CLOUDSTACK-9552.
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Fixed!
> KVM Security Groups do not allow DNS over TCP egress
> ----------------------------------------------------
>
> Key: CLOUDSTACK-9552
> URL: https://issues.apache.org/jira/browse/CLOUDSTACK-9552
> Project: CloudStack
> Issue Type: Bug
> Security Level: Public(Anyone can view this level - this is the
> default.)
> Components: KVM
> Affects Versions: 4.8.0, 4.9.0
> Environment: KVM Basic Networking
> Reporter: Wido den Hollander
> Assignee: Wido den Hollander
> Labels: dns, dnssec, security-groups
> Fix For: 4.9.2.0
>
>
> When egress filtering is configured all outbound traffic is blocked unless
> configured otherwise.
> With the exception that UDP/53 DNS is allowed implicitly by the Security
> Groups.
> Many DNS responses are larger then 4k, with DNSSEC for example and require
> TCP to be allowed.
> The Security Groups should also allow TCP/53 when egress filtering is
> configured.
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