[Xorp-users] Linux 2.6 multicast issue using PIM

[Chris Robson]

--=======F922DC=======
Content-Type: text/plain; x-avg-checked=avg-ok-4A4A2D28; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 8bit

Pavlin

Thanks for the info, but I dont think the setup is the same and I'm no 
expert but not running all Linux 2.6 Fedora Core 2 is also a concern.  From 
your setup I wonder if FreeBSD is hiding a problem?

My setup was the following.......

Host <--> Core 2 (acting as edge router) <--> Core 2 (acting as backbone 
rtr) <--> Core 2 (edge rtr) <--> Host.

I've tried these combos of with no success:
QUAGGA, PIMD
GATED (binaries for Red Hat 7.3 linux 2.4)
XORP

and the PIMDs I find on the net are all from circa linux 2.4 but they do 
build for Linux 2.6.

What I saw was Pim Hellos going out but nothing coming back when running 
tcpdump on one of the edge rtrs.  But as you indicate and I havent done yet 
is run the latest XORP (CVS, I'm  using release 1.0) and just this morning 
I downloaded a new kernel release for Fedora Core 2 on my Web server, so 
obviously I have some updating to do and more testing to run.......

....thanks......

At 06:29 AM 8/21/2004, Pavlin Radoslavov wrote:

> > First, this appears not to be a problem with XORP alone but so far as I 
> can
> > tell every implementation of the protocol stack and Linux 2.6, aka zebra
> > and GATED (commerical) have the same problem.  PIM doesnt seem to reply to
> > hello messages, aka no multicast routing is successful.  Yes, this isnt
> > much and I apologies for what little information I'm giving here, just
> > havent had the time to collect much more at this point.  What I really
> > would like to know is.... has anyone heard of multicast problems with 
> Linux
> > 2.6 in general.  What I have heard, via rumor mill, is there is a fix,
> > something to do with how the API has changed in Linux 2.6 and the 
> mutlicast
> > process.
>
>Chris,
>
>If you want to use IPv6 multicast routing on Linux, it won't work
>simply because the Linux kernel doesn't support it. It has been on
>the TODO list on the Linux IPv6 kernel folks for quite some time
>(e.g., see the Kernel Summit presentations that Adam pointed to in
>his email).
>
>
>If you want to use IPv4 multicast routing on Linux, I just did some
>tests with a 2.6 kernel (running on FedoraCore2) and it appears fine.
>
>OS:
>Linux fedora 2.6.5-1.358smp #1 SMP Sat May 8 09:25:36 EDT 2004 i686
>i686 i386 GNU/Linux
>
>Setup:
>
>[Host1]-----[FreeBSD-4.9]---------[Linux-2.6]------[Host2]
>
>[FreeBSD-4.9] and [Linux-2.6] were running lastest XORP code from CVS.
>[Linux-2.6] was actually running within vmware, and was connected to
>[FreeBSD-4.9] via an openvpn tunnel, so as you can see this was a bit
>of extreme setup. I tried all 4 possible combinations:
>
>* [FreeBSD-4.9] is the RP and [Linux-2.6] is just a router (and
>   vice-versa).
>* [Host1] is the sender, and [Host2] is the receiver (and
>   vice-versa).
>
>In all tests I didn't see anything unusual.
>
>Regards,
>Pavlin
>
>P.S. BTW, can you verify that you have the following options enabled
>in your kernel config:
>
>CONFIG_IP_MROUTE=y
>CONFIG_IP_PIMSM_V2=y
>_______________________________________________
>Xorp-users mailing list
>Xorp-users@xorp.org
>http://mailman.ICSI.Berkeley.EDU/mailman/listinfo/xorp-users
>
>
>
>---
>Incoming mail is certified Virus Free.
>Checked by AVG anti-virus system (http://www.grisoft.com).
>Version: 6.0.742 / Virus Database: 495 - Release Date: 8/19/2004

--=======F922DC=======
Content-Type: text/plain; charset=us-ascii; x-avg=cert; x-avg-checked=avg-ok-4A4A2D28
Content-Disposition: inline


---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.742 / Virus Database: 495 - Release Date: 8/19/2004

--=======F922DC=======--