netdev - RE: How to use gretap with bridge?

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Message-ID: <846C5B546E47494CBBD796CA8CA1617EA3B425@MST-VMAIL1.srv.mst.edu>
Date:	Thu, 29 Oct 2009 13:39:24 -0500
From:	"Neulinger, Nathan" <nneul@....edu>
To:	<netdev@...r.kernel.org>
Subject: RE: How to use gretap with bridge?

I've been able to reproduce this with a upstream kernel (2.6.32-rc5) -
symptom appears to be specific to the IP addresses specified on the ip
command, but not in any clear way. I assume that remote should be the ip
of the host at the remote end of the tunnel, and local should be an IP
address of a real interface on the this machine?

Am I missing something obvious here? At the time of the below commands,
br0 exists, but has no members, and eth0 is configured and up with ip
131.151.0.36/255.255.254.0. All other interfaces are down. 

[root@...dge-rol ~]# ip link add gre3 type gretap remote 131.151.35.35
local 131.151.0.36
[root@...dge-rol ~]# brctl addif br0 gre3
can't add gre3 to bridge br0: Invalid argument

[root@...dge-rol ~]# ip link del gre3
[root@...dge-rol ~]# ip link add gre3 type gretap remote 131.151.35.35
local 131.151.0.35
[root@...dge-rol ~]# brctl addif br0 gre3
can't add gre3 to bridge br0: Invalid argument

[root@...dge-rol ~]# ip link del gre3
[root@...dge-rol ~]# ip link add gre3 type gretap remote 131.151.35.35
local 10.151.0.35
[root@...dge-rol ~]# brctl addif br0 gre3

[root@...dge-rol ~]# ip link del gre3
[root@...dge-rol ~]# ip link add gre3 type gretap remote 131.151.35.35
local 131.1.1.1
[root@...dge-rol ~]# brctl addif br0 gre3
can't add gre3 to bridge br0: Invalid argument



-- Nathan

------------------------------------------------------------
Nathan Neulinger                       nneul@....edu
Missouri S&T Information Technology    (573) 612-1412
System Administrator - Principal       KD0DMH


> -----Original Message-----
> From: Herbert Xu [mailto:herbert@...dor.apana.org.au]
> Sent: Thursday, October 29, 2009 12:07 PM
> To: Neulinger, Nathan
> Subject: Re: How to use gretap with bridge?
> 
> On Thu, Oct 29, 2009 at 10:41:18AM -0500, Neulinger, Nathan wrote:
> > Is there some trick I'm missing to adding a gretap interface to a
> > bridge?
> >
> > ip link add gre1 type gretap remote 131.151.0.36 local 131.151.0.35
> > ip link set gre1 up
> > brctl addbr br0
> > brctl addif br0 gre1
> >
> > This results in an Invalid argument error when issuing the addif.
> > Testing with latest fc12 2.6.31.5-96 kernel.
> >
> > Any suggestions?
> 
> I can't reproduce this here.  Can you please try the latest
> upstream kernel? If it still does the same thing, please post
> to netdev@...r.kernel.org.
> 
> Thanks!
> --
> Visit Openswan at http://www.openswan.org/
> Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
> Home Page: http://gondor.apana.org.au/~herbert/
> PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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