Hey Iwase,
Good news it's working although I couldn't really divide the flow.
Here's what happened.
The flow went to two ports of the switch but the flow is replicated on the port
2 and 3.
in that case making the same bandwidth go on the port 2 and 3.
I used both *weight* variable as *0* and *ofp.OFPGT_ALL*
queue_1 = _parser_.OFPActionSetQueue(0)
actions_1 = [queue_1, _parser_.OFPActionOutput(3)]
queue_2 = _parser_.OFPActionSetQueue(0)
actions_2 = [queue_2, _parser_.OFPActionOutput(2)]
*weight_1 = 0*
* weight_2 = 0*
watch_port = ofproto_v1_3.OFPP_ANY
watch_group = ofproto_v1_3.OFPQ_ALL
req = _parser_.OFPGroupMod(datapath, ofp.OFPFC_ADD, *ofp.OFPGT_ALL*,
group_id, buckets)
I would like to divide the flow in a way that in port 2 have 50% of the band
and port 3 also have 50% of the band.
I changed the *weight* value to *50* and used *ofp.OFPGT_SELECT* but it didn't
work
2018-04-01 23:09 GMT-03:00 Iwase Yusuke <iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>>:
Hi Carlos,
> *match = _parser_.OFPMatch(ipv4_src="192.168.2.2",
ipv4_dst="192.168.1.1")*
This rule does not follow "7.2.3.6 Flow Match Field Prerequisite" in the
OpenFlow Spec 1.3.5, I guess. See the OpenFlow Spec for more details.
Then, please confirm your flow entries are installed on your switch like
"ovs-ofctl dump-flows s1".
Thanks,
Iwase
On 2018年04月02日 10:36, Jose Carlos Ferreira de Melo Junior wrote:
Hey Iwase,
Right now my code looks like this OFPActionGroup is in Red
*port_1 = 3*
* queue_1 = _parser_.OFPActionSetQueue(0)*
* actions_1 = [queue_1, _parser_.OFPActionOutput(4)]*
*
*
*
*
* port_2 = 2*
* queue_2 = _parser_.OFPActionSetQueue(0)*
* actions_2 = [queue_2, _parser_.OFPActionOutput(2)]*
*
*
* weight_1 = 50*
* weight_2 = 50*
* watch_port = ofproto_v1_3.OFPP_ANY*
* watch_group = ofproto_v1_3.OFPQ_ALL*
*
*
* buckets = [*
* _parser_.OFPBucket(weight_1, watch_port, watch_group,
actions_1),*
* _parser_.OFPBucket(weight_2, watch_port, watch_group,
actions_2)]*
*
*
*group_id = 1*
*
*
* req = _parser_.OFPGroupMod(datapath, ofp.OFPFC_ADD,
ofp.OFPGT_SELECT,*
* group_id, buckets)*
* datapath.send_msg(req)*
*match = _parser_.OFPMatch(ipv4_src="192.168.2.2",
ipv4_dst="192.168.1.1")*
*actions = [datapath.ofproto_parser.OFPActionGroup(1)]*
* inst = [_parser_.OFPInstructionActions(ofp.OFPIT_APPLY_ACTIONS,
actions)]*
* mod = datapath.ofproto_parser.OFPFlowMod(datapath, match=match,
cookie=0, command=ofp.OFPFC_ADD, idle_timeout=0, hard_timeout=0,
priority=3, instructions=inst)*
*
*
* datapath.send_msg(mod)*
i was following the code in
http://csie.nqu.edu.tw/smallko/sdn/ryu_multipath_13.htm
<http://csie.nqu.edu.tw/smallko/sdn/ryu_multipath_13.htm>
is it right ?
thanks
2018-04-01 22:14 GMT-03:00 Iwase Yusuke <iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com> <mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>>>:
Hi Carlos,
Hmmmm... have you installed any "flow" entry which contained
OFPActionGroup?
Also, in your code, you uses "group_id = 50" in OFPGroupMod
message. Is
OFPActionGroup using the same "group_id = 50"?
Thanks,
Iwase
On 2018年04月02日 09:36, Jose Carlos Ferreira de Melo Junior wrote:
Hi Iwase,
Sorry for the late answer
well... I checked the group stats as you said and it's not
being looked up
*ovs-ofctl dump-group-stats -O OpenFlow s2*
*OFPST_GROUP reply (OF1.3) (xid=0x2):*
*group_id=1,duration=12.837s,ref_count=0,packet_count=0,byte_count=0,bucket0:packet_count=0,byte_count=0,byte_count=0,bucket1:packet_count=0,byte_count=0*
*
*
I'm really lost and don't know how to fix that
Do you have any idea of how can I solve this problem?
many thanks.
2018-03-29 1:33 GMT-03:00 Iwase Yusuke <iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>> <mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>>>>:
Hi Carlos,
The group entries are looked up (or specified) by
OFPActionGroup in
flow
entries.
If looked up, ref_count, packet_count and byte_count
should be
incremented.
mininet> sh ovs-ofctl dump-group-stats s1 -O OpenFlow13
OFPST_GROUP reply (OF1.3) (xid=0x4):
group_id=1,duration=45.105s,ref_count=1,packet_count=5,byte_count=378,bucket0:packet_count=4,byte_count=336,bucket1:packet_count=1,byte_count=42
Thanks,
Iwase
On 2018年03月27日 23:10, Jose Carlos Ferreira de Melo
Junior wrote:
Hi Iwase,
The group entry is added...
but I don't understand how can be looked up.
I don't know how to do this
Is there any other thing that I am missing ????
thanks in advanced
2018-03-26 20:28 GMT-03:00 Iwase Yusuke
<iwase.yusu...@gmail.com <mailto:iwase.yusu...@gmail.com>
<mailto:iwase.yusu...@gmail.com <mailto:iwase.yusu...@gmail.com>>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>>> <mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>>>>>:
Hi Carlos,
> "*/using the group table with openflow 1.3
with no
sucess/*"
means that I am
> using the group table as i said before and it
is not
working,
means that I am
> using the group specification and it doens't
work.
"Does not work" means
- no group entry added
- group entry exists, but not looked up
- group entry looked up, but packets are not
outputted
or ...
which you mean?
> and about your topology: It has only 2 switches
or 4???
Only 2 switches (s1 and s2), which corresponding
to
"Start" and
"End" switches
on the image you attached on your previous mail.
Also h1
and h2
represents hosts
which do ping.
Thanks,
Iwase
On 2018年03月26日 21:14, Jose Carlos Ferreira de
Melo
Junior wrote:
Hey Iwase,
"*/using the group table with openflow 1.3
with no
sucess/*"
means
that I am using the group table as i said
before and
it is not
working,
means that I am using the group specification
and it
doens't work.
and about your topology: It has only 2
switches or 4???
i don't know if my code is right or if i am
missing
something else.
2018-03-25 21:40 GMT-03:00 Iwase Yusuke
<iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com> <mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com> <mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>>>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>>>> <mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com> <mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>>>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>>>>>>:
Hi Carlos,
For such purpose, OFPGT_SELECT is
appropriate, I
guess.
With the topology;
+--------+
+--------+
| s1 | |
s2 |
+----+ | (port 2)---(port
2) | +----+
| h1 |---(port 1) | |
(port
1)---| h2 |
+----+ | (port 3)---(port
3) | +----+
| | |
|
+--------+
+--------+
I can install groups and flows entries,
then can ping
between h1
and h2 with the
following app.
$ git diff
diff --git a/ryu/app/simple_switch_13.py
b/ryu/app/simple_switch_13.py
index 06a5d0e..e1a5c3b 100644
--- a/ryu/app/simple_switch_13.py
+++ b/ryu/app/simple_switch_13.py
@@ -48,6 +48,30 @@ class
SimpleSwitch13(app_manager.RyuApp):
ofproto.OFPCML_NO_BUFFER)]
self.add_flow(datapath, 0,
match, actions)
+ buckets = [
+ parser.OFPBucket(
+ 50, ofproto.OFPP_ANY,
ofproto.OFPG_ANY,
+
[parser.OFPActionOutput(2)]),
+ parser.OFPBucket(
+ 50, ofproto.OFPP_ANY,
ofproto.OFPG_ANY,
+
[parser.OFPActionOutput(3)]),
+ ]
+ mod = parser.OFPGroupMod(
+ datapath,
ofproto.OFPGC_ADD,
ofproto.OFPGT_SELECT, 1,
buckets)
+ datapath.send_msg(mod)
+
+ match =
parser.OFPMatch(in_port=1)
+ actions =
[parser.OFPActionGroup(1)] #
from host
to switch
+ self.add_flow(datapath, 1,
match, actions)
+
+ match =
parser.OFPMatch(in_port=2)
+ actions =
[parser.OFPActionOutput(1)] #
from
switch to host
+ self.add_flow(datapath, 1,
match, actions)
+
+ match =
parser.OFPMatch(in_port=3)
+ actions =
[parser.OFPActionOutput(1)] #
from
switch to host
+ self.add_flow(datapath, 1,
match, actions)
+
def add_flow(self, datapath,
priority,
match, actions,
buffer_id=None):
ofproto = datapath.ofproto
parser =
datapath.ofproto_parser
I don't know what "using the group table
with
openflow 1.3
with no
sucess"
means, but please confirm your group and
flow
table again.
Thanks,
Iwase
On 2018年03月23日 21:11, Jose Carlos
Ferreira de Melo
Junior wrote:
Hey Iwase,
Split means really divide the flow I
dont know if
would be like
a load
balancing (I think it is)
For example the image below
But I dont know if this would be
possible
using the
group table.
2018-03-23 4:04 GMT-03:00 Iwase
Yusuke
<iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com> <mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com> <mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>>>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>> <mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>>>>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com> <mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>>>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>>>>> <mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com> <mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>>>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>> <mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>>>>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com> <mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>>>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>
<mailto:iwase.yusu...@gmail.com
<mailto:iwase.yusu...@gmail.com>>>>>>>:
Hi Carlos,
What does "split flows" exactly
mean?
> req =
parser.OFPGroupMod(datapath,
ofp.OFPFC_ADD,
ofp.OFPGT_SELECT,
>
group_id,
buckets)
If you specify OFPGT_SELECT,
switch will
execute
"one"
bucket in
the group and
not copied like the port
mirroring. If
you intend
to do port
mirroring, you need
to specify OFPGT_ALL. For other
available group
types,
please refer
to the
OpenFlow spec and your switch's
specification.
Thanks,
Iwase
On 2018年03月21日 04:02, Jose
Carlos
Ferreira de Melo
Junior wrote:
Hi there,
I know this topic was
discussed
before but I
would
like just a
simple
explanation about it.
Because I am using the
group table with
openflow 1.3
with no
sucess.
My purpose is to split one
flow in
two flows and
forward on
port 3 and 4
using the group table.
My code is as follows:
*def group_mod(self,
datapath):*
* global ofp,
_parser_, dp*
* port_1 = 4*
* queue_1 =
_parser_.OFPActionSetQueue(0)*
* actions_1 =
[queue_1,
_parser_.OFPActionOutput(port_1)]*
*
*
*
*
* port_2 = 3*
* queue_2 =
_parser_.OFPActionSetQueue(0)*
* actions_2 =
[queue_2,
_parser_.OFPActionOutput(port_2)]*
*
*
* weight_1 = 50*
* weight_2 = 50*
*
*
* watch_port =
ofproto_v1_3.OFPP_ANY*
* watch_group =
ofproto_v1_3.OFPQ_ALL*
*
*
* buckets = [*
*
_parser_.OFPBucket(weight_1,
watch_port,
watch_group,
actions_1),*
*
_parser_.OFPBucket(weight_2,
watch_port,
watch_group,
actions_2)]*
*
*
* group_id = 50*
*
*
* req =
_parser_.OFPGroupMod(datapath,
ofp.OFPFC_ADD,
ofp.OFPGT_SELECT,*
* group_id,
buckets)*
*
*
*
datapath.send_msg(req)*
*
*
*
*
*
*
Hope this is right.
Could anyone help me with
this issue?
-- Best regards,
José Carlos Ferreira
Msc student in Computer
Science
System and Network Analyst
at PoP-PE/RNP
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<https://lists.sourceforge.net/lists/listinfo/ryu-devel
<https://lists.sourceforge.net/lists/listinfo/ryu-devel>
<https://lists.sourceforge.net/lists/listinfo/ryu-devel
<https://lists.sourceforge.net/lists/listinfo/ryu-devel>>>>
<https://lists.sourceforge.net/lists/listinfo/ryu-devel
<https://lists.sourceforge.net/lists/listinfo/ryu-devel>
<https://lists.sourceforge.net/lists/listinfo/ryu-devel
<https://lists.sourceforge.net/lists/listinfo/ryu-devel>>
<https://lists.sourceforge.net/lists/listinfo/ryu-devel
<https://lists.sourceforge.net/lists/listinfo/ryu-devel>
<https://lists.sourceforge.net/lists/listinfo/ryu-devel
<https://lists.sourceforge.net/lists/listinfo/ryu-devel>>>
<https://lists.sourceforge.net/lists/listinfo/ryu-devel
<https://lists.sourceforge.net/lists/listinfo/ryu-devel>
<https://lists.sourceforge.net/lists/listinfo/ryu-devel
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<https://lists.sourceforge.net/lists/listinfo/ryu-devel
<https://lists.sourceforge.net/lists/listinfo/ryu-devel>
<https://lists.sourceforge.net/lists/listinfo/ryu-devel
<https://lists.sourceforge.net/lists/listinfo/ryu-devel>>>>>>
-- Best regards,
José Carlos Ferreira
Msc student in Computer Science
System and Network Analyst at
PoP-PE/RNP
------------------------------------------------------------------------------
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<https://lists.sourceforge.net/lists/listinfo/ryu-devel
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<https://lists.sourceforge.net/lists/listinfo/ryu-devel
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<https://lists.sourceforge.net/lists/listinfo/ryu-devel
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<https://lists.sourceforge.net/lists/listinfo/ryu-devel
<https://lists.sourceforge.net/lists/listinfo/ryu-devel>
<https://lists.sourceforge.net/lists/listinfo/ryu-devel
<https://lists.sourceforge.net/lists/listinfo/ryu-devel>>>>
<https://lists.sourceforge.net/lists/listinfo/ryu-devel
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<https://lists.sourceforge.net/lists/listinfo/ryu-devel
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<https://lists.sourceforge.net/lists/listinfo/ryu-devel
<https://lists.sourceforge.net/lists/listinfo/ryu-devel>
<https://lists.sourceforge.net/lists/listinfo/ryu-devel
<https://lists.sourceforge.net/lists/listinfo/ryu-devel>>>
<https://lists.sourceforge.net/lists/listinfo/ryu-devel
<https://lists.sourceforge.net/lists/listinfo/ryu-devel>
<https://lists.sourceforge.net/lists/listinfo/ryu-devel
<https://lists.sourceforge.net/lists/listinfo/ryu-devel>>
<https://lists.sourceforge.net/lists/listinfo/ryu-devel
<https://lists.sourceforge.net/lists/listinfo/ryu-devel>
<https://lists.sourceforge.net/lists/listinfo/ryu-devel
<https://lists.sourceforge.net/lists/listinfo/ryu-devel>>>>>
-- Best regards,
José Carlos Ferreira
Msc student in Computer Science
System and Network Analyst at PoP-PE/RNP
------------------------------------------------------------------------------
Check out the vibrant tech community on one
of the
world's most
engaging tech sites, Slashdot.org!
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_______________________________________________
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<mailto:Ryu-devel@lists.sourceforge.net
<mailto:Ryu-devel@lists.sourceforge.net>
<mailto:Ryu-devel@lists.sourceforge.net
<mailto:Ryu-devel@lists.sourceforge.net>>>
<mailto:Ryu-devel@lists.sourceforge.net
<mailto:Ryu-devel@lists.sourceforge.net>
<mailto:Ryu-devel@lists.sourceforge.net
<mailto:Ryu-devel@lists.sourceforge.net>>
<mailto:Ryu-devel@lists.sourceforge.net
<mailto:Ryu-devel@lists.sourceforge.net>
<mailto:Ryu-devel@lists.sourceforge.net
<mailto:Ryu-devel@lists.sourceforge.net>>>>
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<https://lists.sourceforge.net/lists/listinfo/ryu-devel>
<https://lists.sourceforge.net/lists/listinfo/ryu-devel
<https://lists.sourceforge.net/lists/listinfo/ryu-devel>>
<https://lists.sourceforge.net/lists/listinfo/ryu-devel
<https://lists.sourceforge.net/lists/listinfo/ryu-devel>
<https://lists.sourceforge.net/lists/listinfo/ryu-devel
<https://lists.sourceforge.net/lists/listinfo/ryu-devel>>>
<https://lists.sourceforge.net/lists/listinfo/ryu-devel
<https://lists.sourceforge.net/lists/listinfo/ryu-devel>
<https://lists.sourceforge.net/lists/listinfo/ryu-devel
<https://lists.sourceforge.net/lists/listinfo/ryu-devel>>
<https://lists.sourceforge.net/lists/listinfo/ryu-devel
<https://lists.sourceforge.net/lists/listinfo/ryu-devel>
<https://lists.sourceforge.net/lists/listinfo/ryu-devel
<https://lists.sourceforge.net/lists/listinfo/ryu-devel>>>>
-- Best regards,
José Carlos Ferreira
Msc student in Computer Science
System and Network Analyst at PoP-PE/RNP
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the
world's most
engaging tech sites, Slashdot.org!
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<mailto:Ryu-devel@lists.sourceforge.net>
<mailto:Ryu-devel@lists.sourceforge.net
<mailto:Ryu-devel@lists.sourceforge.net>>>
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<https://lists.sourceforge.net/lists/listinfo/ryu-devel>
<https://lists.sourceforge.net/lists/listinfo/ryu-devel
<https://lists.sourceforge.net/lists/listinfo/ryu-devel>>
<https://lists.sourceforge.net/lists/listinfo/ryu-devel
<https://lists.sourceforge.net/lists/listinfo/ryu-devel>
<https://lists.sourceforge.net/lists/listinfo/ryu-devel
<https://lists.sourceforge.net/lists/listinfo/ryu-devel>>>
-- Best regards,
José Carlos Ferreira
Msc student in Computer Science
System and Network Analyst at PoP-PE/RNP
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_______________________________________________
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<https://lists.sourceforge.net/lists/listinfo/ryu-devel>
<https://lists.sourceforge.net/lists/listinfo/ryu-devel
<https://lists.sourceforge.net/lists/listinfo/ryu-devel>>
--
Best regards,
José Carlos Ferreira
Msc student in Computer Science
System and Network Analyst at PoP-PE/RNP
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_______________________________________________
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https://lists.sourceforge.net/lists/listinfo/ryu-devel
<https://lists.sourceforge.net/lists/listinfo/ryu-devel>
--
Best regards,
José Carlos Ferreira
Msc student in Computer Science
System and Network Analyst at PoP-PE/RNP
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
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_______________________________________________
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