LayerscapeのトピックRe: LX2160ARDB ip forwarding not working

LX2160ARDB ip forwarding not working

LeNormich — Wed, 17 Feb 2021 10:23:22 GMT

Hello all,

I'm trying to use the LX2160ARDB as a router but I can't manage to have ip forwarding working.

I'm using the setup in attached files.

The traffic generator sends frames with the following properties:

- ip src=192.85.1.3

- ip dst = 192.85.2.3

- mac src=00:10:94:00:00:01

- mac dst = 00:10:94:00:00:02

- protocol udp

- size 1400 bytes

I use the following commands on LX2160:

ls-addni -nq=16 -t=8 dpmac.3 //creates eth2 ls-addni -nq=16 -t=8 dpmac.4 //creates eth3 ifconfig eth2 hw ether 00:E0:0C:00:77:01 ifconfig eth2 192.85.1.1/24 up ifconfig eth3 hw ether 00:E0:0C:00:77:02 ifconfig eth3 192.85.2.1/24 up arp -s 192.85.1.3 00:10:94:00:00:01 arp -s 192.85.2.3 00:10:94:00:00:02 echo 1 > /proc/sys/net/ipv4/ip_forward echo 1 > /proc/sys/net/ipv4/conf/all/forwarding

I see the frames arriving on eth2 but they are never transmitted to eth3 and back to the generator.

using restool dpni, I see that the frames arrive on interface as "ingress_filtered_frames" increases.

Does someone know why is traffic not sent to the other interface as ip forward should do?

Thanks,

Re: LX2160ARDB ip forwarding not working

bpe — Thu, 18 Feb 2021 12:46:57 GMT

If you want your frames to be processed by a host in any way, the frames must
contain the MAC address of that host in L2 destination address field. You set your
eth2 MAC address to 00:E0:0C:00:77:01 (ifconfig eth2 hw ether 00:E0:0C:00:77:01)
and send test frames with mac dst = 00:10:94:00:00:02. It is therefore no surprise that
they are dropped at eth2 by ingress filtering (DPAA2RM, Section 7.3.25).

Best Regards,
Platon

Re: LX2160ARDB ip forwarding not working

LeNormich — Fri, 19 Feb 2021 09:10:28 GMT

Thanks for the answer!

I changed the dst mac address to 00:E0:0C:00:77:01

but now frames are discarded at ingress and not transmitted to the other interface.

Do you know what causes this behavior? Shouldn't the board transmit frames in this configuration?

Re: LX2160ARDB ip forwarding not working

bpe — Mon, 22 Feb 2021 09:48:03 GMT

It is not fully clear how the behaviour of the system changed, if at all.
Frames drop at ingress were the problem described in the initial post in this
tread. Do you observe any changes in the system reaction to the test stream
after you adjusted the destination MAC, or it is just the same?

Best Regrds
Platon

Re: LX2160ARDB ip forwarding not working

LeNormich — Mon, 22 Feb 2021 09:59:58 GMT

Sorry, i wasn't precise enough: now the "ingress_discarded_frames" counter increases instead of "filtered_frames".

Regards,

Re: LX2160ARDB ip forwarding not working

LeNormich — Tue, 16 Mar 2021 15:24:37 GMT

the following command solved it:

sudo iptables -P FORWARD ACCEPT