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https://issues.apache.org/jira/browse/CLOUDSTACK-9552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15591180#comment-15591180
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ASF GitHub Bot commented on CLOUDSTACK-9552:
--------------------------------------------
GitHub user wido opened a pull request:
https://github.com/apache/cloudstack/pull/1713
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 <w...@widodh.nl>
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/wido/cloudstack CLOUDSTACK-9552
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/cloudstack/pull/1713.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #1713
----
commit 281cd713fdcbb2c825403e1cf80136841ee3fd8a
Author: Wido den Hollander <w...@widodh.nl>
Date: 2016-10-20T08:14:36Z
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 <w...@widodh.nl>
----
> KVM Security Groups do now 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: Future
>
>
> 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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