The problem likely stems from this upstream change:
commit f8337efa4ff5a27e6c1d4e384166413eecd21a65
Author: Petr Machata <[email protected]>
Date: Tue Jun 17 00:44:19 2025 +0200
vxlan: Support MC routing in the underlay
which adds IFLA_VXLAN_MC_ROUTE to the vxlan flags.
On top of that
commit 33460140413ebb045df8de71774a1555abd3efde
Author: Jay Vosburgh <[email protected]>
Date: Wed May 1 14:34:00 2024 +0200
UBUNTU: SAUCE: fan: add VXLAN implementation
...
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -1399,6 +1399,7 @@ enum {
IFLA_VXLAN_LABEL_POLICY, /* IPv6 flow label policy;
ifla_vxlan_label_policy */
IFLA_VXLAN_RESERVED_BITS,
IFLA_VXLAN_MC_ROUTE,
+ IFLA_VXLAN_FAN_MAP = 35,
__IFLA_VXLAN_MAX
};
#define IFLA_VXLAN_MAX (__IFLA_VXLAN_MAX - 1)
adds the flag for the fan map. Historically using a number high enough
to leave a gap. But since we expose the number via procfs there was no
gap in Plucky. We should adjust the fan patch to set no fix number and
just be appended to the set.
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https://bugs.launchpad.net/bugs/2124257
Title:
iproute2 breaking netplan DEP-8 tests in Questing, unexpected "fan-
map" in JSON output
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