Re: pktgen and sniffing VLAN packets
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Ian Brown wrote:
Ben, Thanks. When I remove the "vlan_id" command from the script I do see PKTGEN packets on UDP port 9. These are captured by "tcpdump -f udp port 9" (UDP port 9 is used by default by PKTGEN, I assume that most people here probably know ). The thing is that I do want to generate VLAN tagged traffic. BTW, if I do configure a VLAN on eth0 , I do see VLAN packets (pavkets with ethertype of VLAN), when sniffing with something like "tethereal -R "vlan and host x.y.z.q Any idea why with pktgen I cannot see VLAN traffic ?
It's not pktgen: hw-accel NICs strip the vlan tag on ingress, so you really are generating vlan packets, it's just that the sniffer can't see the tags. Sniff the VLAN device: Anything on it had the VLAN tag on the wire. Ben --Ben Greear <greearb@xxxxxxxxxxxxxxx> Candela Technologies Inc http://www.candelatech.com
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