you need to check that the nic driver you use is 802.1p/Q capable, or you need to get an updated version (i did it for the tulip one, it mainly consists in accepting longer ethernet frames) set up your eth0 interface without an ip eventually set up vlan interfaces with "vconfig" and physical device eth0, at least one to check connectivity then try "tcpdump -i eth0" or "tcpdump -i eth0 -vlan x" this will work as expected if your switch forwards traffic to your machine, with tagged frames. having defined vlans on your switch doesn't imply that all frames are tagged. try to define the port on which you want to run tcpdump as a trunk, this should tag all frames at least to tell about their originating vlan hth A 12:24 08/10/2003 -0400, vous avez écrit : >Hi, > >I am trying to sniff for VLAN packets on a redhat 9 box. I have a network >in which I am using the HP Pro Curve 2500 switches. I have configured my >VLANs on these switches. I have tried the following > >On a redhat 9 box which is connected to a VLAN on the switch, I ran >tcpdump -vlan. However I did not get any packets. The NIC that is >connected to the VLAN is an Intel EtherExpress/100. The driver installed >is e100. > >Can someone plz give me some insight on how to collect the VLAN packets. >What am I missing here ? > >Thanks, >Rahul. > > >-- >redhat-list mailing list >unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe >https://www.redhat.com/mailman/listinfo/redhat-list > > -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list
