wido commented on issue #12210:
URL: https://github.com/apache/cloudstack/issues/12210#issuecomment-3637928850
> Ok, then I don't get it. How does the VM communicate with the gw on the
bridge SVI. They're on separate subnets, you install a default gw to
169.254.0.1 (/32) on the VM but it's unreachable, right? Is there some magic
going on in the driver?
See this part in the netplan config:
```
- to: default
via: 169.254.0.1
on-link: true
```
The magic is the 'on-link' here, where you tell the Linux kernel that this
IP is on the same network and that ARP has to be used.
```
root@web01:~# ip -4 route show
default via 169.254.0.1 dev ens18 proto static onlink
root@web01:~#
```
For IPv6 this is not required as fe80::1 is part of the link-local spec.
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