Re: [Bug 278028] VXLAN interface is not working

From: Zhenlei Huang <zlei_at_FreeBSD.org>
Date: Mon, 21 Apr 2025 09:54:21 UTC 

> On Apr 20, 2025, at 8:20 AM, paige@paige.bio wrote:
> 
> Hey I was kind of wondering for my own info, where would be a good place to open a bug for this particular problem if not here?
> I noticed something earlier which was upon specifying the tunneling parameter for a vxlan interface, I didn’t see tunnelfib in the summary for the interface after but it accepted the parameter. Maybe it’s not supposed to show it in summary I seem to remember on openbsd that it would though (seems like it should)

Just try to make it clear.

The support for ioctl SIOCSTUNFIB ( ifconfig vxlan[N] tunnelfib x ) was added via commit https://cgit.freebsd.org/src/commit/?id=7f7a804ae077 <https://cgit.freebsd.org/src/commit/?id=7f7a804ae077> . 
The man page of ifconfig(8) was updated to reflect the change, but vxlan(4) was not.

Well by default the tunnelfib of a vxlan(4) interface is 0 ( the system's default fib ) and is not displayed. If you set it to a fib number other than 0, ifconfig(8) will show that.

```
# ifconfig vxlan0
vxlan0: flags=1008802<BROADCAST,SIMPLEX,MULTICAST,LOWER_UP> metric 0 mtu 1470
	options=80020<JUMBO_MTU,LINKSTATE>
	ether 58:9c:fc:00:7c:2c
	groups: vxlan
	media: Ethernet autoselect (autoselect <full-duplex>)
	status: active
	nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>

# sysctl net.fibs=2
net.fibs: 1 -> 2

# ifconfig vxlan0 tunnelfib 1
# ifconfig vxlan0
vxlan0: flags=1008802<BROADCAST,SIMPLEX,MULTICAST,LOWER_UP> metric 0 mtu 1470
	options=80020<JUMBO_MTU,LINKSTATE>
	ether 58:9c:fc:00:7c:2c
	groups: vxlan
	tunnelfib: 1
	media: Ethernet autoselect (autoselect <full-duplex>)
	status: active
	nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
```

> where would be a good place to open an inquiry about that? 
> 
> Thanks 
> 
> Sent from my iPhone
> 
>> On Jan 24, 2025, at 8:11 AM, bugzilla-noreply@freebsd.org wrote:
>> 
>> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=278028
>> 
>> Zhenlei Huang <zlei@FreeBSD.org> changed:
>> 
>>          What    |Removed                     |Added
>> ----------------------------------------------------------------------------
>>            Status|New                         |Closed
>>        Resolution|---                         |Works As Intended
>> 
>> --- Comment #14 from Zhenlei Huang <zlei@FreeBSD.org> ---
>> Given this is not the fault of if_vxlan(4) but is a configuration problem (
>> duplicated MAC address ), I'm closing this issue now.
>> 
>> --
>> You are receiving this mail because:
>> You are the assignee for the bug.


Best regards,
Zhenlei