netdev - Re: Is there a preferred way to get the VXLAN port number?

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Date:	Wed, 27 Mar 2013 14:35:51 -0400
From:	David Stevens <dlstevens@...ibm.com>
To:	Stephen Hemminger <stephen@...workplumber.org>
Cc:	Alexander Duyck <alexander.h.duyck@...el.com>,
	David Miller <davem@...emloft.net>,
	"Gasparakis, Joseph" <joseph.gasparakis@...el.com>,
	netdev <netdev@...r.kernel.org>, netdev-owner@...r.kernel.org,
	pshelar@...ira.com, Stephen Hemminger <shemminger@...tta.com>
Subject: Re: Is there a preferred way to get the VXLAN port number?

netdev-owner@...r.kernel.org wrote on 03/27/2013 01:52:54 PM:

> On Tue, 26 Mar 2013 15:02:45 -0700
> Alexander Duyck <alexander.h.duyck@...el.com> wrote:
> 
> > I was wondering if someone would happen to know if there is already a
> > preferred way to get the VXLAN port number for things such as
> > configuring a device to recognize a VXLAN frame on receive for parsing
> > purposes?
> > 
> > I just wanted to check to make sure I hadn't missed something before
> > submitting a patch that would export a simple function for supplying 
the
> > vxlan_port value.

        To answer your question, though, the current vxlan can only listen
on one port per host, supplied with by a module parameter. You can find
what port it's listening on by:

cat /sys/modules/vxlan/parameters/udp_port

[which you can also read with a program, of course].

If multi-port server support is added, that should probably include the
port as part of the current "ip -d link show dev XXX" output, where other
per-device parameters are found.

                                                        +-DLS

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