PaulAngus opened a new issue #4863:
URL: https://github.com/apache/cloudstack/issues/4863
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##### ISSUE TYPE
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* Bug Report
##### COMPONENT NAME
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UI and potentially networking, zone creation etc.
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##### CLOUDSTACK VERSION
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To simplify/consolidate the networking models (primarily to remove a lot of
Cloud Operator confusion) it was 'concluded' that as 'basic networking' is the
same as 'advanced networking with security groups' with only one network
(VLAN); basic networking as a separate networking type could be depreciated.
However, this premise is not correct.
**'Basic networking' is NOT the same as 'advanced networking with security
groups' with only one network (VLAN)**
- Guest networks in basic networking, have ONE SUBNET PER POD, and a gateway
per pod for inter-pod guest traffic. They also have on VR per pod to supply
the DHCP, DNS, metadata and user data for that POD (Broadcast domain).
- Guest networking in an advanced network with security groups has ONE
SUBNET PER VLAN, which spans the ENTIRE ZONE. A zone created in this way would
have one VR for the entire zone.
They may look very similar when there is only one cluster.
BUT THEY ARE COMPLETELY DIFFERENT.
I'm all for renaming the network styles (basic and advanced is just
meaningless). But an 'advanced network with security groups' with one network
zone is nothing like a basic networking zone.
Basic networking cannot be removed in the way that it has.
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##### CONFIGURATION
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advanced networking, etc. N/A otherwise
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##### OS / ENVIRONMENT
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##### SUMMARY
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##### STEPS TO REPRODUCE
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