Date: Wed, 1 Mar 2023 22:32:10 +0100 From: Michael Tuexen <michael.tuexen@lurchi.franken.de> To: "Scheffenegger, Richard" <Richard.Scheffenegger@netapp.com> Cc: "Scheffenegger, Richard" <rscheff@freebsd.org>, "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Re: BPF to filter/mod ARP Message-ID: <F406F3CA-7E41-416F-B64B-EE76DB7F45E7@lurchi.franken.de> In-Reply-To: <PH0PR06MB7639AAFFF7F38C9AD6211ECA86AD9@PH0PR06MB7639.namprd06.prod.outlook.com> References: <b076d803-bc77-f3e2-8452-e85e3ac296b6@freebsd.org> <02B65D42-5097-421A-B951-C947C5DBA465@lurchi.franken.de> <PH0PR06MB7639AAFFF7F38C9AD6211ECA86AD9@PH0PR06MB7639.namprd06.prod.outlook.com>
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> On 1. Mar 2023, at 22:10, Scheffenegger, Richard = <Richard.Scheffenegger@netapp.com> wrote: >=20 >>> On 1. Mar 2023, at 21:33, Scheffenegger, Richard = <rscheff@freebsd.org> wrote: >>>=20 >>> Hi group, >>>=20 >>> Maybe someone can help me with this question - as I am usually only = looking at L4 and the top side of L3 ;) >>=20 >>> In order to validate a peculiar switches behavior, I want to adjust = some fields in gracious arps sent out by an interface, after a new IP is = assigned or changed. >=20 >> Wouldn't scapy allow you to do this kind of testing? >=20 > Unfortunately not - I don't want to forge another packet, I want to = make sure only the specific one is being sent, with the standard GARP = retransmissions and so on. Can't you test what you want to test by generating all the required = packets from scapy? ARP is a pretty simple protocol... Best regards Michael >=20 > Richard >=20
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