Generating DHCP packets

Charlie Boy

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Sep 24, 2020, 4:49:41 AM9/24/20

to ostinato

Dear forum,

I am a student studying aspects of network.

I need to craft several DHCP packets in studying the DORA (Discovery, Offer, Request, Acknowledge) process.

BUT I would need to have the ability to control several ‘options’ within the DHCP packet: notably option 3 and 6 – in order to set the IP address of the DNS server and router respectively.

With a box of routers, this would be carried out on a simple home type network.

I will happily purchase Ostinato if it allows me to set ‘options’ in DHCP or, if not, could I be signposted to software that would give me this control.

Warmest regards - Paul

Aaron Pepelis

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Sep 24, 2020, 8:42:57 AM9/24/20

to Charlie Boy, ostinato

Still open, but it gives the ability at the end in a link if you want to make it yourself.

https://github.com/pstavirs/ostinato/issues/250

I made my own packet headers and used the hex field:

p = stream_id.protocol.add()
p.protocol_id.id = ost_pb.Protocol.kbootpFieldNumber
p.protocol_id.id = ost_pb.Protocol.kHexDumpFieldNumber
payloadData = BootpPacketHeader.get_header_bytes(self).replace(" ", "")
payloadData = binascii.a2b_hex(payloadData)
p.Extensions[hexDump].content = payloadData

aaron

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Srivats P

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Sep 24, 2020, 9:38:14 AM9/24/20

to Aaron Pepelis, Charlie Boy, ostinato

Yes, you can write a user script.

Easier and faster may be to just import a pcap with the required DHCP packets, edit and replay it.

The following websites carry sample DHCP pcaps -

https://wiki.wireshark.org/SampleCaptures

http://njrusmc.net/jobaid/jobaid.html

Srivats (Author, Ostinato)

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