24 Feb
2011
24 Feb
'11
5:02 p.m.
Hello..
I succesfully configured a batman-adv mesh to add access points to our
existing wired lan. I am using Openwrt 10.04 and batman-adv 2010.1.0.
DHCP and everything works as expected. Any wired or wireless client
connecting to the network gets an IP from a DHCP server hooked into the
switch etc etc.
Our Network configuration:
8 batman-adv routers with a wireless mesh with two or more of the
routers having a wired connection directly to the switch. In this case,
the 8 routers decide to pick one of the "plugged in" routers as a
gateway to avoid bridge loops. This is fine.
I have been running into issues with wired clients however.
When a wired client plugged into the switch tries to contact a wired
client plugged into the same switch, the packets manage to get lost. I
believe they are are going through the wireless routers plugged into the
same switch.
Instead of going like this..
PC 1 ----> switch1 ---> PC 2
they seem to be going like this... (my guess).
PC 1 ---> switch1 ---> wireless router 1 ----(wireless mesh link)---->
wireless router 2 ----> switch1 ---> PC 2.
I think this is because the translation tables on the bat node are
announcing that even the wired clients are connected to them.
This is causing extreme delays even in wired clients. Any help will be
appreciated. Should I enable STP in on the switch ports ?
- Vinay
24 Feb
24 Feb
7:44 p.m.
New subject: [B.A.T.M.A.N.] batman-adv mesh slows down wired clients (bridge-loop-avoidance)
Hi Vinay,
On Thu, Feb 24, 2011 at 12:02:55PM -0500, Vinay Tharigopula wrote:
Hello..
I succesfully configured a batman-adv mesh to add access points to
our existing wired lan. I am using Openwrt 10.04 and batman-adv
2010.1.0. DHCP and everything works as expected. Any wired or
wireless client connecting to the network gets an IP from a DHCP
server hooked into the switch etc etc.
The bridge-loop-avoidance feature has been
added in 2011.0.0 and
is not available in 2010.1.0.
If switching to 2011.0.0 helps, don't read any further :).
Could you explain a little more which interfaces you've added to
batman-adv and which interfaces you are bridging with bat0?
(ifconfig, brctl show, batctl if output from one router would be
helpful)
Our Network configuration:
8 batman-adv routers with a wireless mesh with two or more of the
routers having a wired connection directly to the switch. In this
case, the 8 routers decide to pick one of the "plugged in" routers
as a gateway to avoid bridge loops. This is fine.
I have been running into issues with wired clients however.
When a wired client plugged into the switch tries to contact a wired
client plugged into the same switch, the packets manage to get lost.
I believe they are are going through the wireless routers plugged
into the same switch.
Instead of going like this..
PC 1 ----> switch1 ---> PC 2
they seem to be going like this... (my guess).
PC 1 ---> switch1 ---> wireless router 1 ----(wireless mesh
link)----> wireless router 2 ----> switch1 ---> PC 2.
Could you please
verify with "batctl td" (or tcpdump/wireshark) if
the packets are leaving on the wireless router 1's wifi interface?
I think this is because the translation tables on the bat node are
announcing that even the wired clients are connected to them.
Could you check with
batctl tl and batctl tg if these tables are changing
rapidly? If you do not have any client roaming, then these tables are
expected to stay rather static.
This is causing extreme delays even in wired clients. Any help will
be appreciated. Should I enable STP in on the switch ports ?
It does not sound like
having disabled STP is your problem.
- Vinay
Cheers, Linus
8:12 p.m.
Linus, Thanks for replying....
I am having trouble finding binaries of batman-adv 2011.0 for OpenWRT .
Are they available or do I have to build them myself ?
Interfaces:
On my router, totally there are 4 interfaces.
wlan0 - The infrastructure -type network - with Test1 SSID
wlan1- The adhoc network with BSSID "xx:xx:xx:xx:xx:xx"
eth0 - the 4 lan ports.
eth1 - the wan port.
bat0 has wlan1 added to it.
There is a bridge "br-lan" with bat0 eth0 eth1 and wlan0.
On the "chosen gateway" router. I have observed this.
batctl tg
Globally announced HNAs received via the mesh bat0
* 7c:c5:37:6a:ca:cd via 06:24:a5:d8:5d:19
* e2:45:34:51:32:1c via 06:24:a5:d8:5c:16
* 00:24:a5:d8:5c:16 via 06:24:a5:d8:5c:16
* 06:b0:29:d9:45:e5 via 06:24:a5:af:f9:fb
* 7c:c5:37:78:3c:6c via 06:24:a5:d8:5d:19
* 00:24:a5:af:f9:fb via 06:24:a5:af:f9:fb
* 00:1e:c1:c7:53:c2 via 06:24:a5:af:f9:fb
* 00:24:a5:d8:5d:19 via 06:24:a5:d8:5d:19
* 92:b3:f4:d5:c6:f1 via 06:24:a5:d8:5d:19
Note: This is from a group of 4 routers with 2 plugged in via wire.
batctl tl.
It is announcing around 60 hosts and constantly increasing , pretty much
all the hosts connected to the switch that it is plugged into. !
-Vinay
On 2/24/2011 2:44 PM, Linus Lüssing wrote:
Hi Vinay,
On Thu, Feb 24, 2011 at 12:02:55PM -0500, Vinay Tharigopula wrote:
Hello..
I succesfully configured a batman-adv mesh to add access points to
our existing wired lan. I am using Openwrt 10.04 and batman-adv
2010.1.0. DHCP and everything works as expected. Any wired or
wireless client connecting to the network gets an IP from a DHCP
server hooked into the switch etc etc.
The bridge-loop-avoidance feature has been
added in 2011.0.0 and
is not available in 2010.1.0.
If switching to 2011.0.0 helps, don't read any further :).
Could you explain a little more which interfaces you've added to
batman-adv and which interfaces you are bridging with bat0?
(ifconfig, brctl show, batctl if output from one router would be
helpful)
Our Network configuration:
8 batman-adv routers with a wireless mesh with two or more of the
routers having a wired connection directly to the switch. In this
case, the 8 routers decide to pick one of the "plugged in" routers
as a gateway to avoid bridge loops. This is fine.
I have been running into issues with wired clients however.
When a wired client plugged into the switch tries to contact a wired
client plugged into the same switch, the packets manage to get lost.
I believe they are are going through the wireless routers plugged
into the same switch.
Instead of going like this..
PC 1 ----> switch1 ---> PC 2
they seem to be going like this... (my guess).
PC 1 ---> switch1 ---> wireless router 1 ----(wireless mesh
link)----> wireless router 2 ----> switch1 ---> PC 2.
Could you
please verify with "batctl td" (or tcpdump/wireshark) if
the packets are leaving on the wireless router 1's wifi interface?
I think this is because the translation tables on
the bat node are
announcing that even the wired clients are connected to them.
Could you check with
batctl tl and batctl tg if these tables are changing
rapidly? If you do not have any client roaming, then these tables are
expected to stay rather static.
This is causing extreme delays even in wired
clients. Any help will
be appreciated. Should I enable STP in on the switch ports ?
It does not sound
like having disabled STP is your problem.
- Vinay
Cheers, Linus 
25 Feb
25 Feb
12:30 a.m.
Hi Vinay,
I am having trouble finding binaries of batman-adv
2011.0 for OpenWRT .
Are they available or do I have to build them myself ?
as Linus already pointed out - bridge loop avoidance is not available before
batman-adv 2011.0.0. That is what you need to address first.
Where did you get the binaries for batman-adv 2010.1.0 ? Does this source also
provide newer binaries ? Unlike user space application a kernel module heavily
depends on your system (kernel version / patches / etc). Which means nobody
can give you binaries without having access to exactly the same system you are
using.
Regards,
Marek
1:44 p.m.
New subject: [B.A.T.M.A.N.] batman-adv mesh slows down wired clients (bridge-loop-avoidance)
Marek..
I got the binaries from the openwrt prebuilt packages. However, now I
rebuilt the image and built batman-adv 2011.myself. I will try this now
and let you know.
However, now I am running into a much bigger issue. If two routers are
plugged in to the same switch, bridge loop avoidance doesnt work and
both of them are stopping responding to pings.
Here is my config.
bat0 if:
wlan1: active.
wlan1: Mesh Network.
wlan0: Infrastructure network.
eth0 : 4 lan ports
eth1: 1 wan port
br-lan : wlan0 eth0 eth1 bat0
In case anybody else wants the binaries for Openwrt 10.03.1 RC 4 , let
me know I can send it to you.
-Vinay
On 2/24/2011 7:30 PM, Marek Lindner wrote:
Hi Vinay,
I am having trouble finding binaries of
batman-adv 2011.0 for OpenWRT .
Are they available or do I have to build them myself ?
as Linus already pointed
out - bridge loop avoidance is not available before
batman-adv 2011.0.0. That is what you need to address first.
Where did you get the binaries for batman-adv 2010.1.0 ? Does this source also
provide newer binaries ? Unlike user space application a kernel module heavily
depends on your system (kernel version / patches / etc). Which means nobody
can give you binaries without having access to exactly the same system you are
using.
Regards,
Marek
4:14 p.m.
New subject: [B.A.T.M.A.N.] batman-adv mesh slows down wired clients (bridge-loop-avoidance)
Update on this...
As I said previously, after updating to the latest batman-adv, both
routers connected to the lan stopped responding to pings.
I was playing around with the switch settings and setting " Edge + Root
protection with STP" on the ports connected to the routers wired
connection brought them back. Now they act according to the bridge-loop
avoidance document and pick one of the routere to be the primary router
to the lan.
Any idea why this is happening ?
Thanks
Vinay
On 2/25/2011 8:44 AM, Vinay Tharigopula wrote:
Marek..
I got the binaries from the openwrt prebuilt packages. However, now I
rebuilt the image and built batman-adv 2011.myself. I will try this
now and let you know.
However, now I am running into a much bigger issue. If two routers are
plugged in to the same switch, bridge loop avoidance doesnt work and
both of them are stopping responding to pings.
Here is my config.
bat0 if:
wlan1: active.
wlan1: Mesh Network.
wlan0: Infrastructure network.
eth0 : 4 lan ports
eth1: 1 wan port
br-lan : wlan0 eth0 eth1 bat0
In case anybody else wants the binaries for Openwrt 10.03.1 RC 4 , let
me know I can send it to you.
-Vinay
On 2/24/2011 7:30 PM, Marek Lindner wrote:
Hi Vinay,
I am having trouble finding binaries of
batman-adv 2011.0 for OpenWRT .
Are they available or do I have to build them myself ?
as Linus already pointed
out - bridge loop avoidance is not available
before
batman-adv 2011.0.0. That is what you need to address first.
Where did you get the binaries for batman-adv 2010.1.0 ? Does this
source also
provide newer binaries ? Unlike user space application a kernel
module heavily
depends on your system (kernel version / patches / etc). Which means
nobody
can give you binaries without having access to exactly the same
system you are
using.
Regards,
Marek
4:22 p.m.
New subject: [B.A.T.M.A.N.] batman-adv mesh slows down wired clients (bridge-loop-avoidance)
Update on this...
As I said previously, after updating to the latest batman-adv, both
routers connected to the lan stopped responding to pings.
I was playing around with the switch settings and setting " Edge + Root
protection with STP" on the ports connected to the routers wired
connection brought them back. Now they act according to the bridge-loop
avoidance document and pick one of the routere to be the primary router
to the lan.
Any idea why this is happening ?
Thanks
Vinay
On 2/25/2011 8:44 AM, Vinay Tharigopula wrote:
Marek..
I got the binaries from the openwrt prebuilt packages. However, now I
rebuilt the image and built batman-adv 2011.myself. I will try this
now and let you know.
However, now I am running into a much bigger issue. If two routers are
plugged in to the same switch, bridge loop avoidance doesnt work and
both of them are stopping responding to pings.
Here is my config.
bat0 if:
wlan1: active.
wlan1: Mesh Network.
wlan0: Infrastructure network.
eth0 : 4 lan ports
eth1: 1 wan port
br-lan : wlan0 eth0 eth1 bat0
In case anybody else wants the binaries for Openwrt 10.03.1 RC 4 , let
me know I can send it to you.
-Vinay
On 2/24/2011 7:30 PM, Marek Lindner wrote:
Hi Vinay,
I am having trouble finding binaries of
batman-adv 2011.0 for OpenWRT .
Are they available or do I have to build them myself ?
as Linus already pointed
out - bridge loop avoidance is not available
before
batman-adv 2011.0.0. That is what you need to address first.
Where did you get the binaries for batman-adv 2010.1.0 ? Does this
source also
provide newer binaries ? Unlike user space application a kernel
module heavily
depends on your system (kernel version / patches / etc). Which means
nobody
can give you binaries without having access to exactly the same
system you are
using.
Regards,
Marek
10:41 p.m.
New subject: [B.A.T.M.A.N.] batman-adv mesh slows down wired clients (bridge-loop-avoidance)
Hi Vinay,
On Fri, Feb 25, 2011 at 08:44:33AM -0500, Vinay Tharigopula wrote:
Marek..
I got the binaries from the openwrt prebuilt packages. However, now
I rebuilt the image and built batman-adv 2011.myself. I will try
this now and let you know.
However, now I am running into a much bigger issue. If two routers
are plugged in to the same switch, bridge loop avoidance doesnt work
and both of them are stopping responding to pings.
Could you try "batctl
ping" too and check whether this is working
or not.
If that's working but the normal pinging is not, then it should be
a layer 3 problem - in that case we'd need the outputs of "ip
route show" and "ip address show".
If batctl ping is already not working then "batctl o" and "batctl
if" output will be interesting.
Here is my config.
bat0 if:
wlan1: active.
wlan1: Mesh Network.
wlan0: Infrastructure network.
eth0 : 4 lan ports
eth1: 1 wan port
br-lan : wlan0 eth0 eth1 bat0
Hmm, that looks sane and correct, should work like
that.
Is there anything weird in the output of "dmesg"? Any errors or
warnings?
Cheers, Linus
26 Feb
26 Feb
7:31 p.m.
New subject: [B.A.T.M.A.N.] batman-adv mesh slows down wired clients (bridge-loop-avoidance)
Hi Vinay,
On Fri, Feb 25, 2011 at 08:44:33AM -0500, Vinay Tharigopula wrote:
Marek..
I got the binaries from the openwrt prebuilt packages. However,
now
I rebuilt the image and built batman-adv 2011.myself. I will try
this now and let you know.
However, now I am running into a much bigger issue. If two
routers
are plugged in to the same switch, bridge loop avoidance doesnt
work
and both of them are stopping responding to pings.
Could you try "batctl
ping" too and check whether this is working
or not.
If that's working but the normal pinging is not, then it should be
a layer 3 problem - in that case we'd need the outputs of "ip
route show" and "ip address show".
If batctl ping is already not working then "batctl o" and "batctl
if" output will be interesting.
Here is my config.
bat0 if:
wlan1: active.
wlan1: Mesh Network.
wlan0: Infrastructure network.
eth0 : 4 lan ports
eth1: 1 wan port
br-lan : wlan0 eth0 eth1 bat0
Hmm, that looks sane and correct, should work like
that.
Is there anything weird in the output of "dmesg"? Any errors or
warnings?
Cheers, Linus
10:49 p.m.
Hi,
Linus has some problems sending mails to the list, so I forward his reply.
Cheers,
Marek
============================================
Hi Vinay,
On Fri, Feb 25, 2011 at 08:44:33AM -0500, Vinay Tharigopula wrote:
Marek..
I got the binaries from the openwrt prebuilt packages. However,
now
I rebuilt the image and built batman-adv 2011.myself. I will try
this now and let you know.
However, now I am running into a much bigger issue. If two
routers
are plugged in to the same switch, bridge loop avoidance doesnt
work
and both of them are stopping responding to pings.
Could you try "batctl
ping" too and check whether this is working
or not.
If that's working but the normal pinging is not, then it should be
a layer 3 problem - in that case we'd need the outputs of "ip
route show" and "ip address show".
If batctl ping is already not working then "batctl o" and "batctl
if" output will be interesting.
Here is my config.
bat0 if:
wlan1: active.
wlan1: Mesh Network.
wlan0: Infrastructure network.
eth0 : 4 lan ports
eth1: 1 wan port
br-lan : wlan0 eth0 eth1 bat0
Hmm, that looks sane and correct, should work like
that.
Is there anything weird in the output of "dmesg"? Any errors or
warnings?
Cheers, Linus
28 Feb
28 Feb
7:12 p.m.
Linus , Marek...
I think the List had issues with all of us getting multiple emails for
some reason. I wanted to update you on this status and let others know
about my solution.
Linus, in the problem that I described after updating to batman-adv
2011.0, I would lose connection to both the routers that were plugged
in. Any SSH connection already established also would timeout. Therefore
I can't get the output of batctl ping or dmesg at that exact instant. I
did try to do a tcp dump but got nowhere because of the disconnects.
Now here is how I (kinda) solved it.
I had to enable STP on the lan-switches. STP type: STP and Mode: Root
Protection. This can be enabled on all ports safely without causing
disruption to the clients plugged into the switch.
After this step was done, bridge-loop-avoidance worked properly and if
more than 1 router in a mesh was plugged in, all the routers would pick
one as a gateway.
Extra Bonus Step:
If more than one is plugged in, the higher MAC router will drop all lan
packets which will result in slower throughput to clients to that router
because it is hopping to another router via wireless and neglecting the
fact that it's own wired link would take it faster to the intended
destination.
My "solution" to this was to enable STP in the router too. In the UCI
page for networking, under the br-lan, I had this option.
option 'stp' '1'.
After this setting, the 2nd router would choose the wired link as its
preferred method of linking to the network.
The customary "warning" : I am no network expert and I am just offering
a solution for anybody else reading this.
Thanks for all your help Linus and Marek. Please do let me know if you
have any explanation for this :) . If you want me to send some of the
binaries I built or my OpenWRT config files to the list, I can do so .
Let me know.
Thanks
Vinay.
My specific setup:
Routers : 8 x Buffalo WZR - HP -G 300NH
Switches : 6 x 3Com 5500G-EI.
On 2/26/2011 5:49 PM, Marek Lindner wrote:
Hi,
Linus has some problems sending mails to the list, so I forward his reply.
Cheers,
Marek
============================================
Hi Vinay,
On Fri, Feb 25, 2011 at 08:44:33AM -0500, Vinay Tharigopula wrote:
Marek..
I got the binaries from the openwrt prebuilt packages. However,
now
I rebuilt the image and built batman-adv 2011.myself. I will try
this now and let you know.
However, now I am running into a much bigger issue. If two
routers
are plugged in to the same switch, bridge loop avoidance doesnt
work
and both of them are stopping responding to pings.
Could you try "batctl
ping" too and check whether this is working
or not.
If that's working but the normal pinging is not, then it should be
a layer 3 problem - in that case we'd need the outputs of "ip
route show" and "ip address show".
If batctl ping is already not working then "batctl o" and "batctl
if" output will be interesting.
Here is my config.
bat0 if:
wlan1: active.
wlan1: Mesh Network.
wlan0: Infrastructure network.
eth0 : 4 lan ports
eth1: 1 wan port
br-lan : wlan0 eth0 eth1 bat0
Hmm, that looks sane and correct, should work like
that.
Is there anything weird in the output of "dmesg"? Any errors or
warnings?
Cheers, Linus
1 Mar
1 Mar
2:24 a.m.
Hi,
I think the List had issues with all of us getting
multiple emails for
some reason. I wanted to update you on this status and let others know
about my solution.
yes, mailman was standing still due to a deadlock. Sven had to restart mailman
before all the sent mails were processed. Seems some people were getting
impatient .. ;-)
I had to enable STP on the lan-switches. STP type:
STP and Mode: Root
Protection. This can be enabled on all ports safely without causing
disruption to the clients plugged into the switch.
After this step was done, bridge-loop-avoidance worked properly and if
more than 1 router in a mesh was plugged in, all the routers would pick
one as a gateway.
I don't know much about STP (root protection does not tell my anything) but
using STP seems like a very bad idea. STP does not know a thing about your
mesh network and the qualities of the links. To avoid the loop it will simply
turn off "ports" in the router which certainly is not what you want. At some
point in time it might decide to turn off a port you are using ...
I re-read all the mails but I still can't understand your logic: You have 2
batman-adv gateways that announce the wired clients via HNA. This happens to
allow wireless clients connected to the mesh to communicated with your wired
clients. No problem here. Why do you think the packets go through the mesh ?
If more than one is plugged in, the higher MAC router
will drop all lan
packets which will result in slower throughput to clients to that router
because it is hopping to another router via wireless and neglecting the
fact that it's own wired link would take it faster to the intended
destination.
Are you talking about the bridge-loop-avoidance ? What makes you think they
are using the wireless interface to forward the traffic to the other gateway ?
My "solution" to this was to enable STP in
the router too.
Again, using STP on top of batman-adv will create more problems than it
solves.
Regards,
Marek
4405
days inactive
4410
days old
b.a.t.m.a.n@lists.open-mesh.org
11 comments
3 participants
participants (3)
-
Linus Lüssing -
Marek Lindner -
Vinay Tharigopula