[ovs-discuss] The action "dec_ttl" doesn't work

[Allan Jie]

Maybe I will try to clarify my problem again.
My setup is very simple. Using Mininet to configure this network.
h1 (h1-eth0)----(s1-eth1)s1(s1-eth2)---(h1-eth0)h2.

I start the network using this command.
sudo mn --switch ovsk --mac --custom ~/mininet/custom/LinkCustom.py --topo
mytopo
BTW, I try to use the following command to modify something.
sudo ovs-ofctl -O OpenFlow13 add-flow s1
table=0,priority=65535,ip,in_port=1,dl_src=fe:81:d2:69:f6:74,dl_dst=de:dc:30:cd:6f:66,nw_src=10.0.0.1,nw_dst=10.0.0.2,nw_proto=0,nw_tos=0,actions=dec_ttl,mod_nw_dst:10.0.0.3,mod_dl_dst:00:00:00:00:00:11,output:2

And it did change the dst ip and dst mac. (I also use tcpdump command to
monitor on the h2 side)
However, dec_ttl still doesn't work. Can anybody help me out?

--Allan


On Mon, Feb 3, 2014 at 4:11 AM, Justin Pettit <jpettit at nicira.com> wrote:

> I think you need to put the dec_ttl before the output action.
>
> --Justin
>
>
> On 2/2/14, 6:08 AM, "Allan Jie" <allanmcgrady at gmail.com> wrote:
>
> >Dear all,
> >
> >I start a network like 4 host and 1 switches.
> >h1,h2,h3,h4 and s1.
> >
> >
> >I know the dec_ttl action is for ipv4 packet and openflow 1.1+.
> >
> >
> >So I have finished this command.
> >ovs-vsctl set bridge s1 protocols=OpenFlow10,OpenFlow12,OpenFlow13
> >
> >And also use -O OpenFlow13 in ovs-ofctl.
> >Like the following line:
> >ovs-ofctl -O OpenFlow13 add-flow s1
> >table=0,priority=65535,ip,in_port=1,vlan_tci=0x0000,dl_src=9e:60:7c:45:f2:
> >b8,dl_dst=32:a2:19:d3:56:4f,nw_src=10.0.0.1,nw_dst=10.0.0.2,nw_proto=0,nw_
> >tos=0,actions=output:2,dec_ttl
> >
> >
> >Then in h1, I use the command
> >h1 sendip -d dsf -p ipv4 -is 10.0.0.1 -id 10.0.0.2 10.0.0.2
> >which will send an "ip packet" from h1 to h2.
> >
> >And then in h2, I use this command to listen the port.
> >tcpdump ip host 10.0.0.1 -v
> >
> >
> >
> >But the result is I cannot see any changes of the ttl in the received
> >packet. The ttl value is still 64.
> >
> >
> >How can I change that? Please help.
> >
> >Thank you.
> >Allan
> >
> >
> >
> >--
> >Research student, final-year undergraduateExtreme Scale Network Computing
> >and service
> >laboratory(http://www.cloud-uestc.cn/cloud-uestc-EN/index.html),
> >School of Computer Science & Engineering,
> >University of Electronic Science and Technology of
> >China(http://www.oice.uestc.edu.cn/en/).
> >Website: http://www.allanjie.ml/
> >
> >
> >
> >_______________________________________________
> >discuss mailing list
> >discuss at openvswitch.org
> >http://openvswitch.org/mailman/listinfo/discuss
>
>
>


-- 
Research student, final-year undergraduate
Extreme Scale Network Computing and service laboratory(
http://www.cloud-uestc.cn/cloud-uestc-EN/index.html),
School of Computer Science & Engineering,
University of Electronic Science and Technology of China(
http://www.oice.uestc.edu.cn/en/).
Website: http://www.allanjie.ml/
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