[ovs-discuss] How to properly forward certain protocols to a port?

[Can Zhang]

I think I've replied but actually it's in the draft box. Sorry for the
delay.

I captured packets on both interface using wireshark and as I described in
the first mail, I can see ARP request at eth0 but not tap0.

And now I'm considering using a veth pair, say veth0 and veth1. Attach
veth0 to an ovs and configure an IP address on veth1. As:

peer packets --- eth0 ---- ovs ---- veth0 --- veth1(with IP address)

The flows installed are similar as before. So the peer could establish TCP
connections with my machine via veth1's IP address. What do you think of it?


2013/7/25 Jesse Gross <jesse at nicira.com>

> And you ran tcpdump on both ports and you see packets on one but not the
> other?
>
> On Wed, Jul 24, 2013 at 5:54 AM, Can Zhang <can at canx.me> wrote:
> > NXST_FLOW reply (xid=0x4):
> >  cookie=0x0, duration=2938.314s, table=0, n_packets=0, n_bytes=0,
> > idle_age=2938, in_port=1 actions=output:2
> >  cookie=0x0, duration=2943.819s, table=0, n_packets=130, n_bytes=20082,
> > idle_age=11, in_port=2 actions=output:1
> >
> >
> > Just forward all flow from 1 to 2 and 2 to 1.
> >
> >
> > 2013/7/24 Jesse Gross <jesse at nicira.com>
> >>
> >> On Tue, Jul 23, 2013 at 7:11 AM, Can Zhang <can at canx.me> wrote:
> >> > Hello,
> >> >
> >> > Firstly I'll describe a simple scenario I tried:
> >> >
> >> > peer packets --- eth0 ---- ovs ---- tap0
> >> >
> >> > I configured tap0 with IP 192.168.57.100, two flows to forward packets
> >> > from eth0 and tap0 to the other side, and pinged from outside to the
> IP. I
> >> > did capture ARP request on eth0 using wireshark, but could not see any
> >> > packets on tap0. It seems that after attach a port to ovs, the IP
> address is
> >> > no longer effective.
> >> >
> >> > My goal is to use a machine installed with ovs as a openflow switch
> but
> >> > it can also handle some packets(say, a normal socket server can still
> work).
> >> > So I'm thinking of extract some packets to tap0 and make the server
> listen
> >> > on it. But the experiments I did failed as above. I have no idea what
> to try
> >> > next so I come to see if somebody could give me some suggestions.
> >>
> >> What do the flows that you installed look like? At the Open vSwitch
> >> level, IP addresses on the interfaces do not matter.
> >
> >
> >
> >
> > --
> > Best regards,
> > Can Zhang
>



-- 
Best regards,
Can Zhang
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