# mvirt 0.14.9

migrations: no
wire: unchanged
rev: fc2066a5bda693c9d6a4290f0d865e0c962715df

v0.14.9 — guests actually use the overlay MTU

0.14.8 made the platform announce the overlay MTU (underlay minus VXLAN's 50
bytes) as DHCP option 26; the in-guest runtime never requested or applied it,
so pods stayed at 1500 and their full-size frames still did not survive
encapsulation on a 1400-MTU underlay. mvirt-one now requests option 26,
carries it on the lease and sets the link MTU before the address goes on.


## Upgrading

Point your flake's `mvirt` input at this release and redeploy the control-plane
host first, then each node in turn:

```
nix run .#colmena -- apply boot --reboot --on <control-plane host>
nix run .#colmena -- apply boot --reboot --on <node>   # one at a time
```

This release adds no migrations, so the control-plane host rolls back the same way
a node does: boot the previous NixOS generation.