pktgen udp doesn't work over freebsd gateway

[Jason DiCioccio]

Is 192.168.7.1 the freebsd gateway?  Because that would explain it.
You need to send to the linux box's IP

On 2009-05-29, Sebastian Mellmann
<sebastian.mellmann at net.t-labs.tu-berlin.de> wrote:
> Hello everyone!
>
> I'm using 'pktgen' [1] under linux to generate packets.
>
>
> My topology looks like this:
>
> (linux-box #1) <---> (em0 - freebsd-gateway - em1) <---> (linux-box #2)
>
> I want to send packets from linux-box #1 to linux-box #2 over the free-bsd
> gateway.
> The problem is that I can see the packets on em0, but not on em1.
> I assume there's a configuration missing on the BSD machine, because it
> seems it just drops the packets hence doesn't forward them to linux-box
> #2.
>
> rc.conf:
> gateway_enable="YES"
> keymap="german.iso"
> sshd_enable="YES"
> firewall_enable="YES"
> firewall_type="OPEN"
> firewall_logging="YES"
>
> Default option for ipfw is to accept packets.
>
> tcpdump em0:
> 11:42:36.334798 IP (tos 0x0, ttl 32, id 129, offset 0, flags [none], proto
> UDP (17), length 46) 192.168.5.1.9 > 192.168.7.1.9: [no cksum] UDP, length
> 18
> 11:42:36.334802 IP (tos 0x0, ttl 32, id 129, offset 0, flags [none], proto
> UDP (17), length 46) 192.168.5.1.9 > 192.168.7.1.9: [no cksum] UDP, length
> 18
> 11:42:36.334805 IP (tos 0x0, ttl 32, id 129, offset 0, flags [none], proto
> UDP (17), length 46) 192.168.5.1.9 > 192.168.7.1.9: [no cksum] UDP, length
> 18
> 11:42:36.334807 IP (tos 0x0, ttl 32, id 129, offset 0, flags [none], proto
> UDP (17), length 46) 192.168.5.1.9 > 192.168.7.1.9: [no cksum] UDP, length
> 18
> 11:42:36.334810 IP (tos 0x0, ttl 32, id 129, offset 0, flags [none], proto
> UDP (17), length 46) 192.168.5.1.9 > 192.168.7.1.9: [no cksum] UDP, length
> 18
> 11:42:36.334813 IP (tos 0x0, ttl 32, id 129, offset 0, flags [none], proto
> UDP (17), length 46) 192.168.5.1.9 > 192.168.7.1.9: [no cksum] UDP, length
> 18
> 11:42:36.334816 IP (tos 0x0, ttl 32, id 129, offset 0, flags [none], proto
> UDP (17), length 46) 192.168.5.1.9 > 192.168.7.1.9: [no cksum] UDP, length
> 18
> 11:42:36.334819 IP (tos 0x0, ttl 32, id 129, offset 0, flags [none], proto
> UDP (17), length 46) 192.168.5.1.9 > 192.168.7.1.9: [no cksum] UDP, length
> 18
> 11:42:36.334821 IP (tos 0x0, ttl 32, id 129, offset 0, flags [none], proto
> UDP (17), length 46) 192.168.5.1.9 > 192.168.7.1.9: [no cksum] UDP, length
> 18
> 11:42:36.334824 IP (tos 0x0, ttl 32, id 129, offset 0, flags [none], proto
> UDP (17), length 46) 192.168.5.1.9 > 192.168.7.1.9: [no cksum] UDP, length
> 18
>
> tcpdump em1:
> nothing.
>
>
> Is there any sysctl variable that needs to be set?
>
> Connectivity between the boxes is definately working (tested with ping,
> iperf etc.).
>
>
> Regards,
> Sebastian
>
> [1] http://www.linuxfoundation.org/en/Net:Pktgen
>
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