Jaap,
yes, it is a win machine(XP). i'm consulting for them, so i'll see if the user there will dl knoppix, burn a cd, scan from there and send them to me.
in this case, the port on the cisco switch is assigned to a vlan.
thanks for the reply,
fingerprint: E737 C427 FB48 6E51 6C8D ED40 7C8D 1D4E 6F9F B528
Jaap> Hi,
Jaap> Not true. The fact that there are UDP packets running on a native LAN or VLAN
Jaap> which happen to carry a payload which is considered BOOTP has nothing to do
Jaap> with the LAN they are running on.
Jaap> There are numerous ways to get a node on a VLAN. Easiest is to assign a port
Jaap> to a VLAN. Then the host doesn't have to fiddle with VLAN tags and stuff. If
Jaap> the port can't handle the VLAN tagging/untagging, you'll have to configure the
Jaap> host to do so. You can do that by, on the native LAN, forging a DHCP reply
Jaap> option or point it to a configuration file it can read, so it knows what tag
Jaap> to use. Then he restarts the BOOTP procedure applying the tag he received, so
Jaap> he does host configuration on the configured VLAN.
Jaap> See, all depends on the equipment, network design and policy you have.
Jaap> Back to the original question. Sure you should be able to see them. I bet
Jaap> you're using a Windows platform and try to sniff. These cards and their
Jaap> drivers are a pain. Frisbee in a Knoppix lifeCD or something and capture with
Jaap> that. You'll see it. The devil is in the details here.
Jaap> Thanx,
Jaap> Jaap
Jaap> Andreas Fink wrote:
>> I think dhcp always is untagged on ethernet by the standard as it
>> might tell you what vlan to use maybe. At least i had such issues when
>> trying to run a dhcp server on a cisco connected on vlan virtual
>> interfaces
>> Von meinem iPhone gesendet
>> Am 18.03.2008 um 21:08 schrieb wb <wsbcomm@xxxxxxxxxxxxx>:
>>> hey folks,
>>> [sorry for the double post, looks like i posted incorrectly the
>>> first time.]
>>> if i'm sniffing between a linksys router and a cisco swtich, and the
>>> linksys is on a vlan, shouldn't i be able to see DHCP OFFERS &
>>> REQUESTS that clients are getting from this linksys router? or does
>>> vlan tagging hid them or something?
>>> tia
>>> Fingerprint: E737 C427 FB48 6E51 6C8D ED40 7C8D 1D4E 6F9F B528
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