pktgen udp doesn't work over freebsd gateway

[Sebastian Mellmann]

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

No, 192.168.7.1 is the linux box.




Cheers,
Sebastian

> 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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>>
>>     
>
>