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From "ASF subversion and git services (JIRA)" <>
Subject [jira] [Commented] (CLOUDSTACK-9552) KVM Security Groups do not allow DNS over TCP egress
Date Tue, 08 Nov 2016 09:36:58 GMT


ASF subversion and git services commented on CLOUDSTACK-9552:

Commit 8ea75f1a85b53908f97a6397637ecb346b821387 in cloudstack's branch refs/heads/4.9 from
[;h=8ea75f1 ]

CLOUDSTACK-9552: Allow egress TCP/53 implicitly in Basic Networking

Allow DNS queries over TCP when egress filtering is configured.

When using DNSSEC more and more queries are done over TCP and this
requires 53/TCP to be allowed.

Signed-off-by: Wido den Hollander <>

> KVM Security Groups do not allow DNS over TCP egress
> ----------------------------------------------------
>                 Key: CLOUDSTACK-9552
>                 URL:
>             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: Future
> When egress filtering is configured all outbound traffic is blocked unless configured
> 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
> The Security Groups should also allow TCP/53 when egress filtering is configured.

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