Jim,
TCPDUMP puts your Ethernet Adapter in permissive mode so it captures all traffic
passing it. You have to enable it in STN options tab selecting debug support and
tcpdump. Make sure you have RFC 1541 compliance turned off (This is an Old RFC), and
DHCP supplies Network Info checked in the external interface box.
To use TCPDUMP you need to att/F8 or F9 and type in the password, Of Mice and Men
(Caps are important). You should get a # prompt. If you them type tcpdump -q you will
start to capture packets.
DHCP works this way:
A (DHCP Discover) packet is sent to the network. This is a broadcast packet with an
IP address of 0.0.0.0 and a type of BOOTP. The host name is of the Parameters within
the packet. Any DHCP server, or relay agent, listening that is within the scope of the
request will respond with a directed packet (DHCP Offer) to the requesting MAC
address. Multiple servers may respond. One of the offers is selected and a TCP Packet
(DHCP Request) is sent to the DHCP Server. The DCHP server responds with a TCP (DHCP
ACK) packet. This completes the process.
What you need to look for are the replies from the DHCP server.
TCPDUMP is not very easy to use or interpret. I will have a play around with some
captures and filters
-----Original Message-----
From: Jim Harris [SMTP:[EMAIL PROTECTED]]
Sent: Wednesday, January 17, 2001 11:19 AM
To: [EMAIL PROTECTED]
Subject: RE: [STN] "Linux" DHCP vs "M$" DHCP???
Ian,
Since you have obviously been around this block once or twice more than
I have (grin!!) - any chance you can give me the nickel tour of TCPDUMP?
How to invoke it - what does it do, and so forth.
I am sure I would not be the only person thanking you for this
information!!!
Jim
Ian McDermid wrote:
> Jim,
>
> TCPDUMP is an option when you install STN. It is about as user friendly
> as a cornered rat but can be usefull
>
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