In computing, a "one-armed router", also known as a "router on a stick", is a router that has a single physical or logical connection to a network. A one-armed router is often used to forward traffic between locally attached hosts on separate logical routing domains or to facilitate routing table administration, distribution and relay.
Compile the code:
$ mvn clean installRunning the application:
$ ./router-karaf/target/assembly/bin/karaf (required java 8)
$ sudo ./mininet-scripts/test-topology.shThis script will create the test topology to provide the mininet based infrastructure for the vlan routing test as per the test topology.
$ sudo ip netns exec blue /bin/sh
(blue)$ ifconfig
veth1 Link encap:Ethernet HWaddr 56:b6:69:d8:8d:d9
inet addr:1.0.0.1 Bcast:1.0.0.255 Mask:255.255.255.0
inet6 addr: fe80::54b6:69ff:fed8:8dd9/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:30 errors:0 dropped:0 overruns:0 frame:0
TX packets:9 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:5226 (5.2 KB) TX bytes:738 (738.0 B)
(blue)$ route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 1.0.0.11 0.0.0.0 UG 0 0 0 veth1
1.0.0.0 0.0.0.0 255.255.255.0 U 0 0 0 veth1
(red)$ ifconfig
veth3 Link encap:Ethernet HWaddr 56:fa:96:63:5a:64
inet addr:2.0.0.1 Bcast:2.255.255.255 Mask:255.0.0.0
inet6 addr: fe80::54fa:96ff:fe63:5a64/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:27 errors:0 dropped:2 overruns:0 frame:0
TX packets:9 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:4991 (4.9 KB) TX bytes:738 (738.0 B)
(red) $ route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 2.0.0.11 0.0.0.0 UG 0 0 0 veth3
2.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 veth3Start ping from both the host. Router application first discover the host using the ARP packets and does the proxy arp. Then router application writes some flow to the switch to route the packets.
(blue)$ ping 2.0.0.1
PING 2.0.0.1 (2.0.0.1) 56(84) bytes of data.
64 bytes from 2.0.0.1: icmp_req=69 ttl=64 time=0.460 ms
64 bytes from 2.0.0.1: icmp_req=70 ttl=64 time=0.127 ms
64 bytes from 2.0.0.1: icmp_req=71 ttl=64 time=0.068 ms
64 bytes from 2.0.0.1: icmp_req=72 ttl=64 time=0.073 ms
64 bytes from 2.0.0.1: icmp_req=73 ttl=64 time=0.088 ms
64 bytes from 2.0.0.1: icmp_req=74 ttl=64 time=0.088 ms
(red)$ ping 1.0.0.1
PING 1.0.0.1 (1.0.0.1) 56(84) bytes of data.
64 bytes from 1.0.0.1: icmp_req=1 ttl=64 time=145 ms
64 bytes from 1.0.0.1: icmp_req=2 ttl=64 time=0.000 ms
64 bytes from 1.0.0.1: icmp_req=3 ttl=64 time=0.079 ms
64 bytes from 1.0.0.1: icmp_req=4 ttl=64 time=0.075 ms
64 bytes from 1.0.0.1: icmp_req=5 ttl=64 time=0.082 msFlows installed in OF switch (br0) from router-application:
$ sudo ovs-ofctl dump-flows br0
NXST_FLOW reply (xid=0x4):
cookie=0x0, duration=1.947s, table=0, n_packets=1, n_bytes=102, idle_timeout=30, idle_age=0, priority=100,ip,in_port=1,dl_vlan=100,nw_src=1.0.0.1,nw_dst=2.0.0.1 actions=mod_vlan_vid:200,output:2
cookie=0x0, duration=1.943s, table=0, n_packets=1, n_bytes=102, idle_timeout=30, idle_age=0, priority=100,ip,in_port=2,dl_vlan=200,nw_src=2.0.0.1,nw_dst=1.0.0.1 actions=mod_vlan_vid:100,output:1
cookie=0x0, duration=103.651s, table=0, n_packets=20, n_bytes=1872, idle_age=1, priority=0 actions=CONTROLLER:0- Application should able to route the packet over the vlan.
- Application should get the configuration about the sub-interfaces from the user using the rest apis.
- Application will forward the packet as per the provided sub-interface ip addresses.
- Before forwarding the packet to the sub-interface the Application will rewrite the vlan header and mac address.
- Application should also be able to respond for ARP request (Proxy Arp).
Copyright (c) 2016 Subhash Kumar Singh
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Please feel free to write me your suggestions/ comments/ bugs. You can write me your suggestion at subh.singh007@gmail.com