openvswitch - how to capture openflow packets using tshark -


i have system arch linux running ovs. have controller running in same box. have following setup:-

ovs-vsctl set-controller br-int tcp:192.168.1.201:6633

i hoping use tshark( tshark 2.2.8) capture openflow using following command:-

 sudo tshark -i br-int -d tcp.port==6633,openflow -o openflow_v4

it dumps all flows flowing in system no packetin openflow messages. did confirm packetin message received controller. ( pasting last few lines:-)

event ofp_event->eventofppacketin packet in 1237689849893337 b8:27:xx:xx:yy:yy:zz ff:ff:ff:ff:ff:ff:3

i understand tshark document default uses port 6653 openflow.

  tshark -g decodes | grep -i openflow   tcp.port        6653    openflow

however in impression can still openflow traffic using following capture command:-

https://wiki.wireshark.org/openflow

 tshark tcp port 6633

this doesn't work no events captured though can see controller receiving lots of events..

would appreciate here.

my guess you're not listening on correct interface. try following:

sudo tshark -i -d tcp.port==6633,openflow -o openflow_v4

if doesn't work, it's possible controller , switch not communicating using openflow 1.3. make sure see everything, try:

sudo tshark -i -d tcp.port==6633

details. unless there's particular in setup, packets open vswitch controller , not go through bridge. since both ends of communication on same host, packets going through loopback interface:

sudo tshark -i lo -d tcp.port==6633

i able reproduce setup , issue confirm answer open vswitch 2.5.2 , floodlight (master branch). can see packets passing through on loopback interface both tcpdump , tshark.


Comments

Post a Comment

Popular posts from this blog

What is happening when Matlab is starting a "parallel pool"? -

running parallel cpu processes in matlab starts command parpool() according documentation , function: [creates] special job on pool of workers, , [connects] matlab client parallel pool. this function takes bit of time execute, on order of 30 seconds. in other multi-cpu paradigms openmp, parallel execution seems totally transparent -- i've never noticed behavior analogous matlab (granted i'm not experienced parallel programming). so, happening between time parpool() called , when finishes executing? takes long? parallel computing toolbox enables run matlab code in parallel using several different paradigms (e.g. jobs , tasks, parfor , spmd , parfeval , batch processing), , run either locally (parallelised across cores in local machine) or remotely (parallelised across machines in cluster - either 1 own, or 1 in cloud). in of these cases, code run on matlab workers , copies of matlab without interactive desktop. if you're intending run on remo...
Read more

angular - DownloadURL return null in below code -

when change file updated in firebase storage when try downloadurl show null. filechange(event: any) { const imagefolder: string = this.employee.id; const filelist: filelist = event.target.files; const file: file = filelist[0]; const storageref = firebase.storage().ref().child(`${imagefolder}/profile.jpg`).put(file); console.log(storageref.snapshot.downloadurl); } the put() asynchronous. if want url after file uploaded have this: firebase.storage().ref().child(`${imagefolder}/profile.jpg`).put(file).then((snapshot) => { storageref = snapshot.downloadurl: console.log(snapshot.downloadurl); });
Read more

php - Cannot override Laravel Spark authentication with own implementation -

during login process of laravel spark need request token of remote api. api stores exact same users , passwords laravel spark application. therefore need username , non hashed password of user during authentication process. i thought overriding authenticated method solution problem. in routes/web.php override post /login endpoint , pointing endpoint own logincontroller: <?php namespace app\http\controllers\auth; use illuminate\support\facades\log; use illuminate\http\request; use laravel\spark\http\controllers\auth\logincontroller sparklogincontroller; class logincontroller extends sparklogincontroller { /** * create new login controller instance. * * @return void */ public function __construct() { parent::__construct(); } /** * handle successful authentication attempt. * * @param request $request * @param \illuminate\contracts\auth\authenticatable $user * @return response */ public fu...
Read more