[Kea-users] Perfdhcp - simulate broadcast packets

[Darren Ankney]

Hi Matt,

Try using the `-l` option with an interface name and no address
specified at all.  Like this:

perdhcp -l eth0

The man page (https://kea.readthedocs.io/en/kea-2.4.1/man/perfdhcp.8.html)
doesn't make it clear if this results in broadcast traffic and I've
never actually looked that closely at the traffic but it does arrive
at local DHCP servers somehow so it might be?

Thank you,
Darren Ankney

On Mon, Sep 30, 2024 at 12:30 PM Matt Crum <Matt.Crum at pcn-inc.com> wrote:
>
> Hi all,
>
>
>
> We’re trying to run some tests against an ISC DHCP failover DHCP pair using perfdhcp. Unicast works well, but we can’t simulate broadcast traffic (sending to 255.255.255.255 or the broadcast address of the subnet, with -B set).
>
>
>
> We’re running the tool in a Docker container in host mode, in privileged mode (so it can send broadcasts). If I set the destination to 255.255.255.255, we see packets exiting the host (using tcpdump) going to “255.255.255.255” - but these don’t appear to hit the DHCP servers and nothing is coming back to the host.
>
>
>
> It may be an infrastructure/firewall thing, but do we know whether this is possible to generate broadcast packets using the tool / can anyone please shed some light on how to get it to work if so?
>
>
>
> Thanks
>
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