Re: Layer-2 filtering in NPF

[Emmanuel Nyarko <emmankoko519%gmail.com@localhost>]

> On 8 Jul 2025, at 10:13 AM, Markus Kilbinger <mk%kilbi.de@localhost> wrote:
> 
> Hi!
> 
> Thanks for your work and effort!
> 
> I'm using npf on interfaces with changed mac addresses because the
> initial one is set to '00:00:00:00:00:00' on a FriendlyElec NanoPC T6:
> 
>  rge0 at pci1 dev 0 function 0: vendor 10ec product 8125 (rev. 0x05)
>  rge0: interrupting at irq 272
>  rge0: HW rev. B
>  rge0: Ethernet address 00:00:00:00:00:00
> 
> -> ifconfig rge0 link 08:01:25:fd:bf:d5 active
>  ifconfig rge0
>  rge0: flags=0x8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>        ec_capabilities=0x3<VLAN_MTU,VLAN_HWTAGGING>
>        ec_enabled=0x2<VLAN_HWTAGGING>
>        address: 08:01:25:fd:bf:d5
>        media: Ethernet autoselect (1000baseT full-duplex)
>        status: active
>        link 00:00:00:00:00:00
> 
> With this setting activating any npf rule (after import of your new
> layer-2 functionality) breaks / stops network connectivity completely!
> Is there a chance to get this scenario working again with npf?

any rule you mean any rule ?? or layer 2 rules .
> 
> Regards, Markus
> 
> Am Mi., 2. Juli 2025 um 16:13 Uhr schrieb Emmanuel Nyarko
> <emmankoko519%gmail.com@localhost>:
>> 
>> Hi tech-net,
>> 
>> Layer 2 filtering in NPF has been merged. man updated.
>> 
>> Follows a simple
>> 
>> group name direction interface layer-2 {
>>        pass_or_block ether direction interface from src_MAC to dst_MAC type Ex(4 hex for ether_type)
>> }
>> 
>> groups without layer-2 labels have the layer 3 bit set in the attribues automatically (so it doesn’t break existing configurations)
>> so no need to set layer-3 label. layer 2 default group isn’t mandatory until you include a layer 2 group. so your existing configs are safe.
>> 
>> reviewing policy based routing(force a packet to a particular interface) next.
>> 
>> anyone in desperate need of any feature, let me know. i can do my best to finish it quickly.
>> 
>> 
>> Emmanuel
>> 
>> 
>> 
>> 
>> 

Emmanuel