Fernando,
I've used bridge mode before numerous times, but only on two physical
interfaces. According to the network init script, it looks like having
>2 would work, but I don't know if anyone has ever actually tried that.
With two interfaces bridged, I never really saw any noticeable
performance hit, even after doing some stress testing. On a fairly low
powered board, I was able to simulate about 30mbps of bandwidth to
transit the bridge without disrupting call quality or causing any
significant load to the box. However, as always, YMMV. One thing that we
did have an issue with was traffic shaping. Please note that we did this
on a very customized (and older) version of Astlinux, so the current
mainstream version might not be affected, but basically it would
throttle traffic symmetrically and at the lowest value. What I mean by
this is that if you set the circuit speeds to, say, 1500 up and 6000
down, it would throttle both up- and down-stream traffic by the lower
1500 value. Therefore, while we did use this on occasion, it would only
be viable for symmetric speed circuits. Obviously if you aren't using
traffic shaping then that issue is moot anyway.
We used this configuration when we had a customer that had multiple IP
addresses, but wanted our device to sit between the ISP CPE and their
router/firewall. Using 'bridge mode', we were able to pass the extra
public IP address(es) internally, while still providing a level of QoS
and manageability. The configuration is easy and straightforward. Note
however that once an interface is included in a bridge (ie: br0), you
can only apply configuration changes to that virtual interface and not
the individual bridge members. So if you only have four physical
interfaces, and all four are in this bridge, your system will
effectively only have a single interface. This means you won't have any
routing capabilities, as everything will appear to be external. Though
you might be able to setup some crazy VLANs to circumvent this...
Anyway, putting four interfaces into a bridge might have a greater
impact to performance - I couldn't really say. You could always test it
out and see what happens. But I would probably recommend using only two
at most, and putting the second interface into a switch.
-James
On 11/15/2012 09:10 AM, Fernando F. wrote:
David,
Thanks for the reply. I am a bit nervous on how bad the performance
impact will be...
I am trying to move all of my telecom gear to it without the need of
another switch.
Is any body out there actively using their system in bridge mode? How
bad is the performance impact?
Thank You,
Fernando Fuentes
DIGITALVOIPNET.COM <http://DIGITALVOIPNET.COM>
On Thu, Nov 15, 2012 at 7:08 AM, David Kerr <[email protected]
<mailto:[email protected]>> wrote:
At the bottom of the "Network" tab click on edit user variables
and add a line like this into the file...
BRIDGE1="eth1 eth2"
After reboot, a new interface br1 will be visible in the Network
tab of the user interface. As far as I know you can add multiple
eth interfaces to the bridge.
David
On Thu, Nov 15, 2012 at 12:24 AM, Fernando F.
<[email protected] <mailto:[email protected]>> wrote:
Darrick,
Thanks for the advice.
Thank You,
Fernando Fuentes
DIGITALVOIPNET.COM <http://DIGITALVOIPNET.COM>
On Wed, Nov 14, 2012 at 11:21 PM, Darrick Hartman
<[email protected] <mailto:[email protected]>>
wrote:
Fernando,
Yes, this is possible, but that sounds a lot like a switch
with poor performance ;). Take a look at the examples in
/stat/etc/rc.conf. You'll need to have the appropriate
variables added to user.conf, but it should be pretty
straightforward. Again, use /stat/etc/rc.conf as an
example, do NOT edit that file.
If you can't figure it out by tomorrow, I'm sure someone
else can respond with the exact variables. Once you have
the bridge (br0) created, it should show up in the web
interface and allow you to manipulate settings on that
interface.
Again, I really think you'd be better off with a 5 port
switch because bridging those eth devices will come with a
penalty in performance.
Darrick
*From:*Fernando F. [mailto:[email protected]
<mailto:[email protected]>]
*Sent:* Wednesday, November 14, 2012 11:14 PM
*To:* AstLinux Users Mailing List
*Subject:* [Astlinux-users] Bridging eth ports
Is it possible to bridge the eth ports on astlinux?
I am trying to bridge eth1,2,3 to eth0
Thank You,
Fernando Fuentes
DIGITALVOIPNET.COM <http://DIGITALVOIPNET.COM>
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