Thanks, I just read that. Seems like the switch sends it out first, and the controller replies to it with its own hello.
Not a full-fledged controller, just the bare minimum to test my firewall functionality. Can you recommend one (preferably written in python) that I can strip and use? Appreciate it. On Mon, Dec 29, 2014 at 3:21 PM, Ben Pfaff <[email protected]> wrote: > The OpenFlow handshake consists of 2 messages, one in each direction. > > Are you writing your own controller? There are lots of them around so > writing > a new one without reading any of the relevant specifications seems like a > bad > idea. > > On Mon, Dec 29, 2014 at 3:19 PM, Ashok Chippa <[email protected]> > wrote: > > Thanks, makes sense. I am just about to read the OFP... Is this a 3-way > > handshake? > > > > On Mon, Dec 29, 2014 at 3:14 PM, Ben Pfaff <[email protected]> wrote: > >> > >> Both sides of an OpenFlow connection send a hello message. If the > >> controller isn't doing that then it's buggy. > >> > >> On Mon, Dec 29, 2014 at 03:08:14PM -0800, Ashok Chippa wrote: > >> > The controller was down, brought it up and captured the logs again: > >> > > >> > ashok-vb ovs-switchd: -ovs|02752|rconn|DBG|br-int<-> > >> > tcp:127.0.0.1:6789: entering BACKOFF > >> > ashok-vb ovs-switchd: -ovs|02753|rconn|DBG|br-int<->tcp: > 127.0.0.1:6789: > >> > entering CONNECTING > >> > ashok-vb ovs-switchd: -ovs|02754|vconn|DBG|tcp:127.0.0.1:6789: sent > >> > (Success): OFPT_HELLO (OF1.3) (xid=0x2a0): > >> > ashok-vb ovs-switchd: -ovs|02755|rconn|DBG|br-int<- > >> > >tcp:127.0.0.1:6789: entering BACKOFF > >> > <repeat> > >> > > >> > So the openvswitch sends out the OFPT_HELLO and then enters > BACKOFF... I > >> > guess it's not getting a hello back? I need to read the OF protocol > and > >> > see > >> > if controller needs to send a hello back, I am sure it needs to... I > >> > guess > >> > this would be a 2-way/3-way handshake... > >> > > >> > > >> > On Mon, Dec 29, 2014 at 2:49 PM, Ashok Chippa <[email protected]> > >> > wrote: > >> > > >> > > I found them in /var/log/syslog... This is what I see in the logs: > >> > > > >> > > ashok-vb ovs-switchd: ovs|02382|fail_open|INFO|Still in fail-open > mode > >> > > after 21365 seconds disconnected from controller > >> > > ashok-vb ovs-switchd: > >> > > -ovs|02383|rconn|DBG|br-int<->tcp:127.0.0.1:6789: > >> > > entering BACKOFF > >> > > ashok-vb ovs-switchd: > >> > > -ovs|02384|rconn|WARN|br-int<->tcp:127.0.0.1:6789: > >> > > connection failed (Connection refused) > >> > > ashok-vb ovs-switchd: > >> > > -ovs|02385|rconn|DBG|br-int<->tcp:127.0.0.1:6789: > >> > > entering BACKOFF > >> > > ashok-vb ovs-switchd: > >> > > -ovs|02386|rconn|WARN|br-int<->tcp:127.0.0.1:6789: > >> > > connection failed (Connection refused) > >> > > ... > >> > > <repeat> > >> > > > >> > > On the controller I see: > >> > > > >> > > listening on socket 127.0.0.1:6789 > >> > > accept connection from 127.0.0.1:42100 > >> > > accept connection from 127.0.0.1:42101 > >> > > accept connection from 127.0.0.1:42102 > >> > > accept connection from 127.0.0.1:42103 > >> > > <repeat> > >> > > > >> > > > >> > > On Mon, Dec 29, 2014 at 2:37 PM, Ben Pfaff <[email protected]> wrote: > >> > > > >> > >> The logs go wherever you configured them to go with the --log-file > >> > >> option to ovs-vswitchd. > >> > >> > >> > >> On Mon, Dec 29, 2014 at 2:27 PM, Ashok Chippa < > [email protected]> > >> > >> wrote: > >> > >> > Thanks a lot Ben. The command seems to work. Where will I find > the > >> > >> logs? Is > >> > >> > there a way to dump the debug info onto the terminal for quick > >> > >> debugging? > >> > >> > > >> > >> > Appreciate your help. > >> > >> > > >> > >> > Hopefully at some point, all the ovs cli commands will be > >> > >> > uniform... :) > >> > >> > vlog/set v/s vlog-set... similar to ovs-vsctl list-br and not > >> > >> > ovs-vsctl > >> > >> > list/br... :) > >> > >> > > >> > >> > On Mon, Dec 29, 2014 at 10:28 AM, Ben Pfaff <[email protected]> > wrote: > >> > >> >> > >> > >> >> On Fri, Dec 26, 2014 at 09:03:24PM -0800, Ashok Chippa wrote: > >> > >> >> > After fixing the "ovs-vsctl set-controller..." command (with > >> > >> >> > tcp: > >> > >> >> > 127.0.0.1:6789 instead of just 127.0.0.1:6789), I can now get > >> > >> >> > the > >> > >> >> > openvswitch connecting to my controller... > >> > >> >> > > >> > >> >> > However, it seems (but I could be wrong) that the switch seems > >> > >> >> > to be > >> > >> >> > repeatedly connecting with the controller: > >> > >> >> > ashok-vb$ python dispatcher.py > >> > >> >> > _dispatcher_init() > >> > >> >> > listening on socket: 127:0.0.1:6789 > >> > >> >> > Connected with 127.0.0.1:39548 > >> > >> >> > Connected with 127.0.0.1:39549 > >> > >> >> > Connected with 127.0.0.1:39550 > >> > >> >> > Connected with 127.0.0.1:39551 > >> > >> >> > Connected with 127.0.0.1:39552 > >> > >> >> > Connected with 127.0.0.1:39553 > >> > >> >> > Connected with 127.0.0.1:39554 > >> > >> >> > Connected with 127.0.0.1:39555 > >> > >> >> > Connected with 127.0.0.1:39556 > >> > >> >> > Connected with 127.0.0.1:39557 > >> > >> >> > Connected with 127.0.0.1:39558 > >> > >> >> > Connected with 127.0.0.1:39559 > >> > >> >> > Connected with 127.0.0.1:39560 > >> > >> >> > Connected with 127.0.0.1:39561 > >> > >> >> > ... > >> > >> >> > > >> > >> >> > Any clues from openvswitch + socket experts out there as to > why > >> > >> >> > this > >> > >> may > >> > >> >> > be > >> > >> >> > happening? Appreciate it. > >> > >> >> > >> > >> >> I'd look in the ovs-vswitchd log. If ovs-vswitchd is > >> > >> >> disconnecting, > >> > >> >> it should tell you why. You might get more information if you > >> > >> >> turn up > >> > >> >> appropriate logging levels: "ovs-appctl vlog/set vconn rconn" > >> > >> > > >> > >> > > >> > >> > >> > >> > >> > >> > >> > >> -- > >> > >> "I don't normally do acked-by's. I think it's my way of avoiding > >> > >> getting blamed when it all blows up." Andrew Morton > >> > >> > >> > > > >> > > > > > > > > > > -- > "I don't normally do acked-by's. I think it's my way of avoiding > getting blamed when it all blows up." Andrew Morton >
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