[B.A.T.M.A.N.] Batman-Adv : Hops and Throughput with Collocated dual-radio

[B.A.T.M.A.N.] Batman-Adv : Hops and Throughput with Collocated dual-radio

[Zaki]

Hi,

I am a newbie in batman-adv.  I got a question regarding Hops and
Throughput, especially in regards with a collocated dual-radio device.
 Hopefully somebody could offer some help here for me to fully
understand batman-adv operation.  I have 3 devices, namely A, B and C.

A is only having single radio (operating at Freq 5.20G in AdHoc mode).
 Put this under bat0.  Bridge bat0 with eth0.
B is having dual-radio (radio1 operates at 5.20G in AdHoc mode, radio2
is at 5.24G in AdHoc mode). Put these under bat0. Bridge bat0 with
eth0
C is like A (single radio, operating at 5.24G in AdHoc mode). Put this
under bat0.  Bridge bat0 with eth0.

So, the wireless link will be like this :

[A]::::::::::::::: [B(radio1)---B(radio2)]::::::::::::::::[C]

1) If i were to ping from A to C, how many hops is it considered?.  Is
it 2 hops or 3 hops?.
2) If my Iperf TCP throughput from A to B is 40Mbps, what is the
expected throughput of Iperf from A to C ?.

Thanks a lot.

Jack.

Re: [B.A.T.M.A.N.] Batman-Adv : Hops and Throughput with Collocated dual-radio

[Simon Wunderlich]

[-- Attachment #1: Type: text/plain, Size: 1748 bytes --]

Hi Zaki/Jack,

On Fri, Oct 11, 2013 at 11:11:04AM +0800, Zaki wrote:
> Hi,
> 
> I am a newbie in batman-adv.  I got a question regarding Hops and
> Throughput, especially in regards with a collocated dual-radio device.
>  Hopefully somebody could offer some help here for me to fully
> understand batman-adv operation.  I have 3 devices, namely A, B and C.
> 
> A is only having single radio (operating at Freq 5.20G in AdHoc mode).
>  Put this under bat0.  Bridge bat0 with eth0.
> B is having dual-radio (radio1 operates at 5.20G in AdHoc mode, radio2
> is at 5.24G in AdHoc mode). Put these under bat0. Bridge bat0 with
> eth0
> C is like A (single radio, operating at 5.24G in AdHoc mode). Put this
> under bat0.  Bridge bat0 with eth0.
> 
> So, the wireless link will be like this :
> 
> [A]::::::::::::::: [B(radio1)---B(radio2)]::::::::::::::::[C]
> 
> 1) If i were to ping from A to C, how many hops is it considered?.  Is
> it 2 hops or 3 hops?.

that would be two hops. One hop is considered traversing one link, and
you have two links here.

> 2) If my Iperf TCP throughput from A to B is 40Mbps, what is the
> expected throughput of Iperf from A to C ?.

That depends. If the links are not interferring, you should get approx.
the maximum of both link throughputs. So if one link is 30 mbit/s, the second
is 25 mbit/s, that whole path would yield 25 mbit/s - there might be tcp
effects further decreasing throughput (latency etc).

However you use two frequencies adjacent to each other. If you use omni
antennas, expect a lot of interferences (even if the channels are not
overlapping). If you use directional antennas you should be fine.

Cheers,
	Simon


> 
> Thanks a lot.
> 
> Jack.

[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 198 bytes --]

Re: [B.A.T.M.A.N.] Batman-Adv : Hops and Throughput with Collocated dual-radio

[Zaki]

Hi Simon,

Thanks for your reply.  I am using omni antenna right now and what i
got when i did an iPerf from A to C is only 20Mbps.  It looks like the
throughput is cut to half (just like a single radio mesh).  Tried 2.4G
frequency in one of the pair, had the same result too.  Anything in
terms of setting of batman-adv i can look for?.

Rgds,
Jack

On Sun, Oct 13, 2013 at 10:36 PM, Simon Wunderlich
<simon.wunderlich@s2003.tu-chemnitz.de> wrote:
> Hi Zaki/Jack,
>
> On Fri, Oct 11, 2013 at 11:11:04AM +0800, Zaki wrote:
>> Hi,
>>
>> I am a newbie in batman-adv.  I got a question regarding Hops and
>> Throughput, especially in regards with a collocated dual-radio device.
>>  Hopefully somebody could offer some help here for me to fully
>> understand batman-adv operation.  I have 3 devices, namely A, B and C.
>>
>> A is only having single radio (operating at Freq 5.20G in AdHoc mode).
>>  Put this under bat0.  Bridge bat0 with eth0.
>> B is having dual-radio (radio1 operates at 5.20G in AdHoc mode, radio2
>> is at 5.24G in AdHoc mode). Put these under bat0. Bridge bat0 with
>> eth0
>> C is like A (single radio, operating at 5.24G in AdHoc mode). Put this
>> under bat0.  Bridge bat0 with eth0.
>>
>> So, the wireless link will be like this :
>>
>> [A]::::::::::::::: [B(radio1)---B(radio2)]::::::::::::::::[C]
>>
>> 1) If i were to ping from A to C, how many hops is it considered?.  Is
>> it 2 hops or 3 hops?.
>
> that would be two hops. One hop is considered traversing one link, and
> you have two links here.
>
>> 2) If my Iperf TCP throughput from A to B is 40Mbps, what is the
>> expected throughput of Iperf from A to C ?.
>
> That depends. If the links are not interferring, you should get approx.
> the maximum of both link throughputs. So if one link is 30 mbit/s, the second
> is 25 mbit/s, that whole path would yield 25 mbit/s - there might be tcp
> effects further decreasing throughput (latency etc).
>
> However you use two frequencies adjacent to each other. If you use omni
> antennas, expect a lot of interferences (even if the channels are not
> overlapping). If you use directional antennas you should be fine.
>
> Cheers,
>         Simon
>
>
>>
>> Thanks a lot.
>>
>> Jack.

Re: [B.A.T.M.A.N.] Batman-Adv : Hops and Throughput with Collocated dual-radio

[Linus Lüssing]

Hi Jack,

what is the throughput you get from B to C? What was the
throughput you got on the 2.4GHz link alone? Did you change to
2.4GHz on A-B or B-C?

Cheers, Linus


On Mon, Oct 14, 2013 at 09:26:41AM +0800, Zaki wrote:
> Hi Simon,
> 
> Thanks for your reply.  I am using omni antenna right now and what i
> got when i did an iPerf from A to C is only 20Mbps.  It looks like the
> throughput is cut to half (just like a single radio mesh).  Tried 2.4G
> frequency in one of the pair, had the same result too.  Anything in
> terms of setting of batman-adv i can look for?.
> 
> Rgds,
> Jack
> 
> On Sun, Oct 13, 2013 at 10:36 PM, Simon Wunderlich
> <simon.wunderlich@s2003.tu-chemnitz.de> wrote:
> > Hi Zaki/Jack,
> >
> > On Fri, Oct 11, 2013 at 11:11:04AM +0800, Zaki wrote:
> >> Hi,
> >>
> >> I am a newbie in batman-adv.  I got a question regarding Hops and
> >> Throughput, especially in regards with a collocated dual-radio device.
> >>  Hopefully somebody could offer some help here for me to fully
> >> understand batman-adv operation.  I have 3 devices, namely A, B and C.
> >>
> >> A is only having single radio (operating at Freq 5.20G in AdHoc mode).
> >>  Put this under bat0.  Bridge bat0 with eth0.
> >> B is having dual-radio (radio1 operates at 5.20G in AdHoc mode, radio2
> >> is at 5.24G in AdHoc mode). Put these under bat0. Bridge bat0 with
> >> eth0
> >> C is like A (single radio, operating at 5.24G in AdHoc mode). Put this
> >> under bat0.  Bridge bat0 with eth0.
> >>
> >> So, the wireless link will be like this :
> >>
> >> [A]::::::::::::::: [B(radio1)---B(radio2)]::::::::::::::::[C]
> >>
> >> 1) If i were to ping from A to C, how many hops is it considered?.  Is
> >> it 2 hops or 3 hops?.
> >
> > that would be two hops. One hop is considered traversing one link, and
> > you have two links here.
> >
> >> 2) If my Iperf TCP throughput from A to B is 40Mbps, what is the
> >> expected throughput of Iperf from A to C ?.
> >
> > That depends. If the links are not interferring, you should get approx.
> > the maximum of both link throughputs. So if one link is 30 mbit/s, the second
> > is 25 mbit/s, that whole path would yield 25 mbit/s - there might be tcp
> > effects further decreasing throughput (latency etc).
> >
> > However you use two frequencies adjacent to each other. If you use omni
> > antennas, expect a lot of interferences (even if the channels are not
> > overlapping). If you use directional antennas you should be fine.
> >
> > Cheers,
> >         Simon
> >
> >
> >>
> >> Thanks a lot.
> >>
> >> Jack.

Re: [B.A.T.M.A.N.] Batman-Adv : Hops and Throughput with Collocated dual-radio

[Zaki]

Hi Linus,

From A to B(radio 1) it is 5.24GHz. Throughput is 40Mbps.

From B(radio 2) to C it is 2.412GHz.
Throughput is 38Mbps.

From A to C the throughput is just 20Mbps.

Thanks.
Jack.

On Mon, Oct 14, 2013 at 11:37 PM, Linus Lüssing <linus.luessing@web.de> wrote:
> Hi Jack,
>
> what is the throughput you get from B to C? What was the
> throughput you got on the 2.4GHz link alone? Did you change to
> 2.4GHz on A-B or B-C?
>
> Cheers, Linus
>
>
> On Mon, Oct 14, 2013 at 09:26:41AM +0800, Zaki wrote:
>> Hi Simon,
>>
>> Thanks for your reply.  I am using omni antenna right now and what i
>> got when i did an iPerf from A to C is only 20Mbps.  It looks like the
>> throughput is cut to half (just like a single radio mesh).  Tried 2.4G
>> frequency in one of the pair, had the same result too.  Anything in
>> terms of setting of batman-adv i can look for?.
>>
>> Rgds,
>> Jack
>>
>> On Sun, Oct 13, 2013 at 10:36 PM, Simon Wunderlich
>> <simon.wunderlich@s2003.tu-chemnitz.de> wrote:
>> > Hi Zaki/Jack,
>> >
>> > On Fri, Oct 11, 2013 at 11:11:04AM +0800, Zaki wrote:
>> >> Hi,
>> >>
>> >> I am a newbie in batman-adv.  I got a question regarding Hops and
>> >> Throughput, especially in regards with a collocated dual-radio device.
>> >>  Hopefully somebody could offer some help here for me to fully
>> >> understand batman-adv operation.  I have 3 devices, namely A, B and C.
>> >>
>> >> A is only having single radio (operating at Freq 5.20G in AdHoc mode).
>> >>  Put this under bat0.  Bridge bat0 with eth0.
>> >> B is having dual-radio (radio1 operates at 5.20G in AdHoc mode, radio2
>> >> is at 5.24G in AdHoc mode). Put these under bat0. Bridge bat0 with
>> >> eth0
>> >> C is like A (single radio, operating at 5.24G in AdHoc mode). Put this
>> >> under bat0.  Bridge bat0 with eth0.
>> >>
>> >> So, the wireless link will be like this :
>> >>
>> >> [A]::::::::::::::: [B(radio1)---B(radio2)]::::::::::::::::[C]
>> >>
>> >> 1) If i were to ping from A to C, how many hops is it considered?.  Is
>> >> it 2 hops or 3 hops?.
>> >
>> > that would be two hops. One hop is considered traversing one link, and
>> > you have two links here.
>> >
>> >> 2) If my Iperf TCP throughput from A to B is 40Mbps, what is the
>> >> expected throughput of Iperf from A to C ?.
>> >
>> > That depends. If the links are not interferring, you should get approx.
>> > the maximum of both link throughputs. So if one link is 30 mbit/s, the second
>> > is 25 mbit/s, that whole path would yield 25 mbit/s - there might be tcp
>> > effects further decreasing throughput (latency etc).
>> >
>> > However you use two frequencies adjacent to each other. If you use omni
>> > antennas, expect a lot of interferences (even if the channels are not
>> > overlapping). If you use directional antennas you should be fine.
>> >
>> > Cheers,
>> >         Simon
>> >
>> >
>> >>
>> >> Thanks a lot.
>> >>
>> >> Jack.

Re: [B.A.T.M.A.N.] Batman-Adv : Hops and Throughput with Collocated dual-radio

[Linus Lüssing]

Hi Jack,

One more test could be interesting: What throughput do you get
with static routes over the wifi interfaces directly, without
batman-adv?

Just to check whether it's batman-adv's fault or something else
(e.g. cheap, unshielded wifi chips, a bug in the test setup /
configuration).

Cheers, Linus


On Thu, Oct 17, 2013 at 11:21:57AM +0800, Zaki wrote:
> Hi Linus,
> 
> From A to B(radio 1) it is 5.24GHz. Throughput is 40Mbps.
> 
> From B(radio 2) to C it is 2.412GHz.
> Throughput is 38Mbps.
> 
> From A to C the throughput is just 20Mbps.
> 
> Thanks.
> Jack.
> 
> On Mon, Oct 14, 2013 at 11:37 PM, Linus Lüssing <linus.luessing@web.de> wrote:
> > Hi Jack,
> >
> > what is the throughput you get from B to C? What was the
> > throughput you got on the 2.4GHz link alone? Did you change to
> > 2.4GHz on A-B or B-C?
> >
> > Cheers, Linus
> >
> >
> > On Mon, Oct 14, 2013 at 09:26:41AM +0800, Zaki wrote:
> >> Hi Simon,
> >>
> >> Thanks for your reply.  I am using omni antenna right now and what i
> >> got when i did an iPerf from A to C is only 20Mbps.  It looks like the
> >> throughput is cut to half (just like a single radio mesh).  Tried 2.4G
> >> frequency in one of the pair, had the same result too.  Anything in
> >> terms of setting of batman-adv i can look for?.
> >>
> >> Rgds,
> >> Jack
> >>
> >> On Sun, Oct 13, 2013 at 10:36 PM, Simon Wunderlich
> >> <simon.wunderlich@s2003.tu-chemnitz.de> wrote:
> >> > Hi Zaki/Jack,
> >> >
> >> > On Fri, Oct 11, 2013 at 11:11:04AM +0800, Zaki wrote:
> >> >> Hi,
> >> >>
> >> >> I am a newbie in batman-adv.  I got a question regarding Hops and
> >> >> Throughput, especially in regards with a collocated dual-radio device.
> >> >>  Hopefully somebody could offer some help here for me to fully
> >> >> understand batman-adv operation.  I have 3 devices, namely A, B and C.
> >> >>
> >> >> A is only having single radio (operating at Freq 5.20G in AdHoc mode).
> >> >>  Put this under bat0.  Bridge bat0 with eth0.
> >> >> B is having dual-radio (radio1 operates at 5.20G in AdHoc mode, radio2
> >> >> is at 5.24G in AdHoc mode). Put these under bat0. Bridge bat0 with
> >> >> eth0
> >> >> C is like A (single radio, operating at 5.24G in AdHoc mode). Put this
> >> >> under bat0.  Bridge bat0 with eth0.
> >> >>
> >> >> So, the wireless link will be like this :
> >> >>
> >> >> [A]::::::::::::::: [B(radio1)---B(radio2)]::::::::::::::::[C]
> >> >>
> >> >> 1) If i were to ping from A to C, how many hops is it considered?.  Is
> >> >> it 2 hops or 3 hops?.
> >> >
> >> > that would be two hops. One hop is considered traversing one link, and
> >> > you have two links here.
> >> >
> >> >> 2) If my Iperf TCP throughput from A to B is 40Mbps, what is the
> >> >> expected throughput of Iperf from A to C ?.
> >> >
> >> > That depends. If the links are not interferring, you should get approx.
> >> > the maximum of both link throughputs. So if one link is 30 mbit/s, the second
> >> > is 25 mbit/s, that whole path would yield 25 mbit/s - there might be tcp
> >> > effects further decreasing throughput (latency etc).
> >> >
> >> > However you use two frequencies adjacent to each other. If you use omni
> >> > antennas, expect a lot of interferences (even if the channels are not
> >> > overlapping). If you use directional antennas you should be fine.
> >> >
> >> > Cheers,
> >> >         Simon
> >> >
> >> >
> >> >>
> >> >> Thanks a lot.
> >> >>
> >> >> Jack.

Re: [B.A.T.M.A.N.] Batman-Adv : Hops and Throughput with Collocated dual-radio

[Zaki]

Hi Linus,

Good idea.  I will try that right away.

Thanks.
Jack.

On Thu, Oct 17, 2013 at 12:28 PM, Linus Lüssing <linus.luessing@web.de> wrote:
> Hi Jack,
>
> One more test could be interesting: What throughput do you get
> with static routes over the wifi interfaces directly, without
> batman-adv?
>
> Just to check whether it's batman-adv's fault or something else
> (e.g. cheap, unshielded wifi chips, a bug in the test setup /
> configuration).
>
> Cheers, Linus
>
>
> On Thu, Oct 17, 2013 at 11:21:57AM +0800, Zaki wrote:
>> Hi Linus,
>>
>> From A to B(radio 1) it is 5.24GHz. Throughput is 40Mbps.
>>
>> From B(radio 2) to C it is 2.412GHz.
>> Throughput is 38Mbps.
>>
>> From A to C the throughput is just 20Mbps.
>>
>> Thanks.
>> Jack.
>>
>> On Mon, Oct 14, 2013 at 11:37 PM, Linus Lüssing <linus.luessing@web.de> wrote:
>> > Hi Jack,
>> >
>> > what is the throughput you get from B to C? What was the
>> > throughput you got on the 2.4GHz link alone? Did you change to
>> > 2.4GHz on A-B or B-C?
>> >
>> > Cheers, Linus
>> >
>> >
>> > On Mon, Oct 14, 2013 at 09:26:41AM +0800, Zaki wrote:
>> >> Hi Simon,
>> >>
>> >> Thanks for your reply.  I am using omni antenna right now and what i
>> >> got when i did an iPerf from A to C is only 20Mbps.  It looks like the
>> >> throughput is cut to half (just like a single radio mesh).  Tried 2.4G
>> >> frequency in one of the pair, had the same result too.  Anything in
>> >> terms of setting of batman-adv i can look for?.
>> >>
>> >> Rgds,
>> >> Jack
>> >>
>> >> On Sun, Oct 13, 2013 at 10:36 PM, Simon Wunderlich
>> >> <simon.wunderlich@s2003.tu-chemnitz.de> wrote:
>> >> > Hi Zaki/Jack,
>> >> >
>> >> > On Fri, Oct 11, 2013 at 11:11:04AM +0800, Zaki wrote:
>> >> >> Hi,
>> >> >>
>> >> >> I am a newbie in batman-adv.  I got a question regarding Hops and
>> >> >> Throughput, especially in regards with a collocated dual-radio device.
>> >> >>  Hopefully somebody could offer some help here for me to fully
>> >> >> understand batman-adv operation.  I have 3 devices, namely A, B and C.
>> >> >>
>> >> >> A is only having single radio (operating at Freq 5.20G in AdHoc mode).
>> >> >>  Put this under bat0.  Bridge bat0 with eth0.
>> >> >> B is having dual-radio (radio1 operates at 5.20G in AdHoc mode, radio2
>> >> >> is at 5.24G in AdHoc mode). Put these under bat0. Bridge bat0 with
>> >> >> eth0
>> >> >> C is like A (single radio, operating at 5.24G in AdHoc mode). Put this
>> >> >> under bat0.  Bridge bat0 with eth0.
>> >> >>
>> >> >> So, the wireless link will be like this :
>> >> >>
>> >> >> [A]::::::::::::::: [B(radio1)---B(radio2)]::::::::::::::::[C]
>> >> >>
>> >> >> 1) If i were to ping from A to C, how many hops is it considered?.  Is
>> >> >> it 2 hops or 3 hops?.
>> >> >
>> >> > that would be two hops. One hop is considered traversing one link, and
>> >> > you have two links here.
>> >> >
>> >> >> 2) If my Iperf TCP throughput from A to B is 40Mbps, what is the
>> >> >> expected throughput of Iperf from A to C ?.
>> >> >
>> >> > That depends. If the links are not interferring, you should get approx.
>> >> > the maximum of both link throughputs. So if one link is 30 mbit/s, the second
>> >> > is 25 mbit/s, that whole path would yield 25 mbit/s - there might be tcp
>> >> > effects further decreasing throughput (latency etc).
>> >> >
>> >> > However you use two frequencies adjacent to each other. If you use omni
>> >> > antennas, expect a lot of interferences (even if the channels are not
>> >> > overlapping). If you use directional antennas you should be fine.
>> >> >
>> >> > Cheers,
>> >> >         Simon
>> >> >
>> >> >
>> >> >>
>> >> >> Thanks a lot.
>> >> >>
>> >> >> Jack.

Re: [B.A.T.M.A.N.] Batman-Adv : Hops and Throughput with Collocated dual-radio

[Zaki]

Hi Linus, Simon,

Testing with static routes yields the same result.  After thorough
testing, i found strange throughput pattern on one of my radio.  It's
my hardware problem after all.  Phew...
Thanks a lot for your input. I appreciate it.

Rgds,
Jack.

On Thu, Oct 17, 2013 at 12:28 PM, Linus Lüssing <linus.luessing@web.de> wrote:
> Hi Jack,
>
> One more test could be interesting: What throughput do you get
> with static routes over the wifi interfaces directly, without
> batman-adv?
>
> Just to check whether it's batman-adv's fault or something else
> (e.g. cheap, unshielded wifi chips, a bug in the test setup /
> configuration).
>
> Cheers, Linus
>
>
> On Thu, Oct 17, 2013 at 11:21:57AM +0800, Zaki wrote:
>> Hi Linus,
>>
>> From A to B(radio 1) it is 5.24GHz. Throughput is 40Mbps.
>>
>> From B(radio 2) to C it is 2.412GHz.
>> Throughput is 38Mbps.
>>
>> From A to C the throughput is just 20Mbps.
>>
>> Thanks.
>> Jack.
>>
>> On Mon, Oct 14, 2013 at 11:37 PM, Linus Lüssing <linus.luessing@web.de> wrote:
>> > Hi Jack,
>> >
>> > what is the throughput you get from B to C? What was the
>> > throughput you got on the 2.4GHz link alone? Did you change to
>> > 2.4GHz on A-B or B-C?
>> >
>> > Cheers, Linus
>> >
>> >
>> > On Mon, Oct 14, 2013 at 09:26:41AM +0800, Zaki wrote:
>> >> Hi Simon,
>> >>
>> >> Thanks for your reply.  I am using omni antenna right now and what i
>> >> got when i did an iPerf from A to C is only 20Mbps.  It looks like the
>> >> throughput is cut to half (just like a single radio mesh).  Tried 2.4G
>> >> frequency in one of the pair, had the same result too.  Anything in
>> >> terms of setting of batman-adv i can look for?.
>> >>
>> >> Rgds,
>> >> Jack
>> >>
>> >> On Sun, Oct 13, 2013 at 10:36 PM, Simon Wunderlich
>> >> <simon.wunderlich@s2003.tu-chemnitz.de> wrote:
>> >> > Hi Zaki/Jack,
>> >> >
>> >> > On Fri, Oct 11, 2013 at 11:11:04AM +0800, Zaki wrote:
>> >> >> Hi,
>> >> >>
>> >> >> I am a newbie in batman-adv.  I got a question regarding Hops and
>> >> >> Throughput, especially in regards with a collocated dual-radio device.
>> >> >>  Hopefully somebody could offer some help here for me to fully
>> >> >> understand batman-adv operation.  I have 3 devices, namely A, B and C.
>> >> >>
>> >> >> A is only having single radio (operating at Freq 5.20G in AdHoc mode).
>> >> >>  Put this under bat0.  Bridge bat0 with eth0.
>> >> >> B is having dual-radio (radio1 operates at 5.20G in AdHoc mode, radio2
>> >> >> is at 5.24G in AdHoc mode). Put these under bat0. Bridge bat0 with
>> >> >> eth0
>> >> >> C is like A (single radio, operating at 5.24G in AdHoc mode). Put this
>> >> >> under bat0.  Bridge bat0 with eth0.
>> >> >>
>> >> >> So, the wireless link will be like this :
>> >> >>
>> >> >> [A]::::::::::::::: [B(radio1)---B(radio2)]::::::::::::::::[C]
>> >> >>
>> >> >> 1) If i were to ping from A to C, how many hops is it considered?.  Is
>> >> >> it 2 hops or 3 hops?.
>> >> >
>> >> > that would be two hops. One hop is considered traversing one link, and
>> >> > you have two links here.
>> >> >
>> >> >> 2) If my Iperf TCP throughput from A to B is 40Mbps, what is the
>> >> >> expected throughput of Iperf from A to C ?.
>> >> >
>> >> > That depends. If the links are not interferring, you should get approx.
>> >> > the maximum of both link throughputs. So if one link is 30 mbit/s, the second
>> >> > is 25 mbit/s, that whole path would yield 25 mbit/s - there might be tcp
>> >> > effects further decreasing throughput (latency etc).
>> >> >
>> >> > However you use two frequencies adjacent to each other. If you use omni
>> >> > antennas, expect a lot of interferences (even if the channels are not
>> >> > overlapping). If you use directional antennas you should be fine.
>> >> >
>> >> > Cheers,
>> >> >         Simon
>> >> >
>> >> >
>> >> >>
>> >> >> Thanks a lot.
>> >> >>
>> >> >> Jack.