ustcweizhou opened a new pull request #4303:
URL: https://github.com/apache/cloudstack/pull/4303
## Description
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When use Ubuntu 20.04 as hypervisor, and create an advanced zone with
security groups, the systemvms (ssvm and cpvm) will be started but the cloud
service will not be Up.
in /var/log/cloud.log, it says vm is unable to connect to management server
on port 8250.
Later I found there is caused by a iptables rule below
```
-A BF-cloudbr0 -m physdev --physdev-out ens3: --physdev-is-bridged -j ACCEPT
```
The physical device should be "ens3" and "ens3:", which comes from
```
root@node62:~# bridge -o link show | awk '/master cloudbr0 / && !/^[0-9]+:
vnet/ {print $2}' | head -1
ens3:
```
There is no issue with ubuntu 16.04
```
root@node12:~# bridge -o link show | awk '/master cloudbr0 / && !/^[0-9]+:
vnet/ {print $2}' | head -1
eth0
```
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## Types of changes
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boxes that apply: -->
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] New feature (non-breaking change which adds functionality)
- [X] Bug fix (non-breaking change which fixes an issue)
- [ ] Enhancement (improves an existing feature and functionality)
- [ ] Cleanup (Code refactoring and cleanup, that may add test cases)
## Screenshots (if appropriate):
## How Has This Been Tested?
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