Hi,
I added the following lines to the event handler
if (eth.dst == eth.src):
print(f'EQUAL MACs: SRC: {eth.src} == DST: {eth.dst}')
return
EQUAL MACs: SRC: 00:1e:be:17:eb:9a == DST: 00:1e:be:17:eb:9a
EQUAL MACs: SRC: c4:71:fe:10:fe:00 == DST: c4:71:fe:10:fe:00
EQUAL MACs: SRC: 00:1e:be:17:eb:9a == DST: 00:1e:be:17:eb:9a
I see lots of equal MACs but now I get no new flows added:
~$ curl -X GET http://198.8.8.235:8080/stats/flow/176199429686713; echo
{"176199429686713": [{"priority": 0, "cookie": 0, "idle_timeout": 0,
"hard_timeout": 0, "byte_count": 51783, "duration_sec": 319,
"duration_nsec": 180000000, "packet_count": 648, "length": 80, "flags": 0,
"actions": ["OUTPUT:CONTROLLER"], "match": {}, "table_id": 0}]}
regards,
Diarmuid
--
*Irish by birth, located in Uganda but Munster by the grace of God.*
On Mon, 4 Mar 2019 at 12:16, Diarmuid O Briain <diarm...@obriain.com> wrote:
> Hi,
>
> Referring to a mail I chain I started on this email group a couple of
> weeks ago. The support engineer in Netgear asked me for a simple
> description and how it could be replicated.
>
> For reference and in case anyone here is interested I attach this
> description and a howto replicate.
>
> Essentially the Netgear switch sends a packet for each port that has SRC
> MAC == DST MAC:
>
> - IN PORT: 1
> - SRC_MAC: *00:1e:be:17:eb:9a*
> - DST_MAC: *00:1e:be:17:eb:9a*
>
> This causes the simple_switch_13.py to ADD FLOW with the in port and the
> out port the same.
>
> - Priority: 1
> - OFPMatch(oxm_fields={*'in_port': 1*, 'eth_dst':'00:1e:be:17:eb:9a'})
> - [OFPActionOutput(len=16,max_len=65509,*port=1*,type=0)]
> - Buffer ID: 267
>
> Would it be safe to add a loop to drop add_flow() calls where the Match
> port and the Action port are the same as well as the src and dst MAC
> addresses? Is there any condition where that would be normal behaviour?
>
> regards,
>
> Diarmuid
> --
>
> *Irish by birth, located in Uganda but Munster by the grace of God.*
>
>
>
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