Re: ipv4 route with ipv6 local link nexthop ?

> On Mar 13, 2024, at 12:19 PM, Zhenlei Huang <zlei@FreeBSD.org> wrote:
> 
> 
> 
>> On Mar 13, 2024, at 4:36 AM, Benoit Chesneau <benoitc@enki-multimedia.eu <mailto:benoitc@enki-multimedia.eu>> wrote:
>> 
>> On latest freebsd 14.0 release , I am trying to join an ipv4 address over an IPV6 local link using the following command :
>> 
>> `route add -net 10.200.1.1/32 -inet6 fe80::9439:36ff:fef0:7cbd%vlan200`
>> 
>> But I  get the following error:
>> 
>> ```
>> route add -net 10.200.1.1/32 -inet6 fe80::9439:36ff:fef0:7cbd%vlan200
>> add net 10.200.1.1: gateway fe80::9439:36ff:fef0:7cbd%vlan200 fib 0: Invalid argument
> 
> I guess that is regression by transition of route(8) to NETLINK.
> 
> Can you please build sbin/route from source without NETLINK and give it another try ?
> 
> ```
> # cd /usr/src/sbin/route
> # setenv MK_NETLINK_SUPPORT no
> # make
> ```

Hi Benoit,

I managed to repeat this bug.

As a workaround, add an IPv4 address to the outgoing interface (vlan200 in your case),
```
# ifconfig vlan200 inet x.x.x.x/y
```

then retry adding the route
```
# route add -net 10.200.1.1/32 -inet6 fe80::9439:36ff:fef0:7cbd%vlan200
```

> 
>> ```
>> 
>> ping6 to `fe80::9439:36ff:fef0:7cbd%vlan200` works. What I am doing wrong? Configuration of the interface is the following:
>> 
>> ```
>> vlan200: flags=1008843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST,LOWER_UP> metric 0 mtu 1500
>>         options=4600703<RXCSUM,TXCSUM,TSO4,TSO6,LRO,RXCSUM_IPV6,TXCSUM_IPV6,MEXTPG>
>>         ether fe:d9:dd:2d:35:c5
>>         inet6 fe80::fcd9:ddff:fe2d:35c5%vlan200 prefixlen 64 scopeid 0x5
>>         groups: vlan
>>         vlan: 200 vlanproto: 802.1q vlanpcp: 0 parent interface: iavf0
>>         media: Ethernet autoselect (10Gbase-SR <full-duplex>)
>>         status: active
>>         nd6 options=23<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL
>> ```
>> 
>> 
>> 
>> Benoît 
> 
> Best regards,
> Zhenlei