Re: Change (spoof) MAC address

On Mon Jan 2, 2023 at 5:36 PM CET, Tomaž Kokolj wrote:
> Hi,
>
> Thank you for the reply.
>
> > Read the hostname.if(5) man page and focus on STATIC ADDRESS CONFIGURATION
> > part paragraph options aka you can't mix (at least that's what's written)
> > autoconf with static addressing (which your ISP provides, right?) and you
> > can't use options (like lladdr) without configuring IP/netmask at same
> time.
>
> I may have written this incorrectly.
> My ISP provides dynamic IPs via DHCP. I have requested a fixed IP address
> which they have bound to my MAC address on my WAN port.
> Which means that whenever I change my hardware I need to spoof my MAC
> address or I will get a random IP address.
> So the autoconf option should be the valid and correct way.
>
> > That is quite outdated document of course, but dhcp is shortcut for
> > 'inet autoconf'
>
> > Plus classic dhclient is going away and instead dhcpleased(8) is used.
>
> > So look in dhcpleased.conf(5) and use option 'send client id'
>
> For reference, this is my Debian configuration:
> # cat /etc/network/interfaces
> auto enp1s0
> allow-hotplug enp1s0
> iface enp1s0 inet dhcp
> hwaddress ether 00:11:22:33:44:55
>
> I want to achieve the same on OpenBSD. My current configuration is:
> # cat /etc/hostname.em0
> inet autoconf
>
> # cat /etc/dhcpleased.conf
> interface em0 {
> send client id "00:11:22:33:44:55"
> }

you are missing 01: on start as suggested in man page

>
> But my lladdr remains unchanged.
>
> Best regards,
> Tomaz
>
> V V pon., 2. jan. 2023 ob 14:42 je oseba Bodie <bodie@bodie.cz> napisala:
>
> > On Mon Jan 2, 2023 at 1:44 PM CET, Tomaž Kokolj wrote:
> > > Hi everyone,
> > >
> > > I've requested a static IP from my ISP a long time ago and I figured out
> > > that my ISP binds my IP based on a MAC address which is connected to my
> > WAN
> > > port.
> > >
> > > I was thinking about switching from Debian Linux to OpenBSD on my router,
> > > but I can't figure out how to change my MAC address.
> > >
> > > I've tried the the following configurations for my /etc/hostname.em0 (I'm
> > > testing this in VirtualBox):
> > > #
> > > inet autoconf lladdr 00:11:22:33:44:55
> > > #
> > >
> > > #
> > > lladdr 00:11:22:33:44:55
> > > inet autoconf
> > > #
> > >
> > > #
> > > inet autoconf
> > > lladdr 00:11:22:33:44:55
> > > #
> > > In all of those configurations, my lladdr gets changed to
> > 00:11:22:33:44:55
> > > but the inet line is missing from ifconfig which means that my network
> > > isn't working.
> >
> > Read the hostname.if(5) man page and focus on STATIC ADDRESS CONFIGURATION
> > part paragraph options aka you can't mix (at least that's what's written)
> > autoconf with static addressing (which your ISP provides, right?) and you
> > can't use options (like lladdr) without configuring IP/netmask at same
> > time.
> >
> > >
> > > I have found this old (2012) blog post:
> > >
> > https://andrewmemory.wordpress.com/2012/12/06/changing-mac-address-on-openbsd/
> > >
> > > Which suggested:
> > > "Linux has /etc/network/interfaces, and OpenBSD has /etc/hostname.if. I
> > > just changed my /etc/hostname.vr1 to:
> > >
> > > dhcp lladdr 00:11:22:33:44:55
> > >
> >
> > That is quite outdated document of course, but dhcp is shortcut for
> > 'inet autoconf'
> >
> > Plus classic dhclient is going away and instead dhcpleased(8) is used.
> >
> > So look in dhcpleased.conf(5) and use option 'send client id'
> >
> > > and I was requesting an IP address using my new MAC address"
> > >
> > > If I do that my inet line is present and my network/internet is working,
> > > but my lladdr line isn't changed.
> > >
> > > Any suggestions?
> > >
> > > Best regards,
> > > Tomaz
> >
> >