multi interfaces(vlans) configuration

[Ahiya Zadok]

Eventually, I understood that the DHCP relay limitation isn't real
I was misled by the vendor's support engineer.

Thank you all for responding

-----Original Message-----
From: dhcp-users <dhcp-users-bounces at lists.isc.org> On Behalf Of Simon
Hobson
Sent: Friday, October 9, 2020 5:17 PM
To: Users of ISC DHCP <dhcp-users at lists.isc.org>
Subject: Re: multi interfaces(vlans) configuration


> On 9 Oct 2020, at 07:02, sthaug at nethelp.no wrote:
>
>> ISC dhcpd needs to access the raw ethernet interface, so doesn't play
>> well with vlan sub-interfaces.
>
> "Doesn't play well with vlan sub-interfaces" may be the case for Linux.
> We're running ISC dcpd with multiple VLANs on FreeBSD, and it seems to
> work just fine.

I'm pretty certain I've done it with linux in the past. Does "raw packet"
literally mean "packet from the NIC buffer", or does it mean "packet from
the OS buffer after the OS has done the VLAN stuff" ?
Without any knowledge of how it's actually done, it would seem logical to
me for the VLAN (and link aggregation/bonding) code to handle that aspect
before squirting the packet into the packet buffer ready to go into the
rest of the network stack. So tagged packet in -> tag stripped by VLAN
code -> packet put into buffer as though it had been received that way
(untagged) on that interface.

Simon
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