Masquerading MAC addresses

MJ mafsys1234 at
Tue Oct 29 00:32:36 UTC 2019

On 29/10/2019 10:57 am, Nathan Robertson wrote:
>   Hi,
> I have an interesting issue that I'm hoping that somebody might be able to
> point me in the right direction on. Even just a pointer or two, or where to
> go ask. I've got a situation where my VPS provider is packet filtering my
> traffic based on MAC address, and as a result are dropping my jail traffic
> (as FreeBSD bridges traffic from the jail to the network using the jail's
> MAC address). I need a way to essentially masquerade the MAC address for
> outbound traffic on the host interface to get past the VPS vendors firewall.
> Basically, I need vnet jails with IP addresses to use the host adapters MAC
> address for outbound connections (think of it as masquerading / NAT of MAC
> addresses). On Linux, it looks like ebtables can do it (MAC NAT -
> I can see ipfw
> supports packet filtering based on MAC address, but I can't find anything
> on packet mangling.
> Any idea of where I should look or who I could ask about MAC NAT on FreeBSD?
> Thanks for any help provided. This one's really starting to do my head in.
> Nathan.

Sounds like you need some sort of ARP proxy?

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