I want to clarify the problem. And I don't why I cannot post that correctly.
Now here is the thing. I start a network like 4 host and 1 switches. h1,h2 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. I have done that according to Justin information. But I still cannot get it work. I change the ovs-ofctl like this as you said. (position of dec_ttl and output) ovs-ofctl -O OpenFlow13 add-flow s1 table=0,priority=65535,ip,in_port=1,dl_src=3e:a4:62:46:92:28,dl_dst=86:9e:4b:4c:54:53,nw_src=10.0.0.1,nw_dst=10.0.0.2,nw_proto=0,nw_tos=0,actions=dec_ttl,output:2 However, when I also use another actions, it seems that it doesn't work too. Like I use this following actions actions=del_ttl,mod_nw_tos:0x08,output:2 But I use tcpdump ip host 10.0.0.1 -v I cannot see any change of the "tos" value of the packet. Here comes the result of tcpdump ------------------------------------ 10.0.0.1 > 10.0.0.2: ip 3 17:57:42.921902 IP (tos 0xc0, ttl 64, id 56235, offset 0, flags [none], proto ICMP (1), length 51) -------------------------------- My environment is mininet 2.1 and openvswitch 1.10. 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? -- 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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