Looking for help to improve Airport performance over LAN (WAN is fine)

Ok, I've read through several threads on this forum that address problems people are having with slow performance with Airport. I've also checked out all of the Apple KBs that address Airport, recommended settings. Unfortunately my issue isn't addressed by anything I've read to date.
The bottom line is that both download and upload performance between any of my devices and the internet is fine, no problems. I am paying for 30MBps download from Verizon FIOS, I routinely get 20, and I'm guessing that the delta is Verizon's problem, not my network's. However, streaming from my media server to another device on the wireless LAN is a different story entirely. I get somewhere between 1 and 2 MBps, tops, and this poses big problems for streaming music and movies.
My network is comprised of 3 Airport Expresses. One of them is a MC414LL/A model. This one is connected to my Verizon FIOS Actiontec MI424WR router (which I have set to bridge-mode according to the instructions provided at http://www.dslreports.com/forum/r17679150-Howto-make-ActionTec-MI424WR-a-network -bridge) via CAT5 ethernet. This Airport Express is set to "create a network" network mode, "802.11 only (5GHz) - 802.11b/g/n" radio mode (although I have also tried "802.11 only (5GHz) - 802.11/n only (2.4 GHz)" radio mode, and this didn't solve the problem). Finally, I have chosen 2.4 and 5GHz channels that have little interference (2 and 161 respectively). My other two Airport Expresses are MB321LL/A models and are set to "Extend a wireless network" network mode, with the 5GHz network chosen as the network that they extend. (I have tried switching over to having them extend the 2.4GHz network, and performance gets worse, not better.)
I am using a late 2009 Mac Mini as a media server. It is connected to the 5GHz network (though I've tried the 2.4GHz network), and it runs XBMC and JRiver media servers (not simultaneously, either one or the other.) I have a PS3 and a Sony Blu Ray player, each plugged into one of the MB321LL/A Airport Expresses via CAT5 ethernet, and I stream media to each of these devices via one or the other media server (both devices are DNLA-enabled). My Mac Mini has a 3TB external hard drive connected via FireWire 800, which is where all of my media resides. In addition to streaming media over the network, I have a TV plugged directly into the Mac Mini. When I play media to this TV, performance is outstanding, so I'm confident my poor performance to the PS3 and Sony BDP is a network issue, not an issue with the external drive.
Although my building has several other wireless networks, only one of them is 5 GHz, and it isn't using channel 161. The 2.4 GHz band is crowded with several networks, although channel 2 is usually in the clear. I have tried switching let Airport choose a channel automatically, and I haven't noticed a difference. It has occurred to me that the problem could be with how I bridged the Verizon Actiontec router and not with any of the Airports, but I don't get any errors (e.g. double NAT errors, which some people who have bridged improperly get), and I am pleased with my download and upload speeds to the internet. The issue is only on my LAN. Finally, yes, all of my firmware is up to date, version 7.6.3 on all three Airport Expresses.
Can anyone offer me suggestions for how I can get better performance streaming media from my server to the two playback devices? Since all 3 Airport Expresses support 5GHz, I'd have thought I'd be able to take advantage of 802.11n speeds when streaming between them. (MB321LL/A supports "Draft N", but does this matter?) With the settings that I'm currently using, I can't stream faster than 2MBps (and that's on a good day), which is below what I ought to be able to get rom 802.11g. This is especially problematic when I try to stream hi res (96 MHz / 24 bit or higher) music files, whether uncompressed or compressed. I hear awful pulsing sounds through my speakers. If I pause the track and let my streaming device buffer, I might get 10 or 15 seconds of clean playback, but then it starts the pulsing again as soon as the buffered music is finished playing. On occasion when I stream music from my iPhone via Airplay to one of the Airport Expresses, I get clean playback most of the time, but on occasion the music cuts out. (It's my understanding the Airplay requires ~800 Kbps, which seems consistent with my LAN speed usually being between 1 and 2 Mbps but sometimes dropping).
I have iStubler and I've used the Apple network diagnostics -- these are the tools that led me to choose channels 2 and 161 for 2.4 and 5GHz respectively. I'm sure I could be using these tools to learn more about my network's performance, but I'm sure what to look for.
Thanks for your suggestions.

Ok, cool. I'm really glad that the issue has been isolated. Thanks a ton for your insight!
Hopefully I can find a spot where the signal strength of the hub is noticably better but that isn't too inconvenient for an ethernet run. My Sony BDP, which is the device connected to the problem basestation, has wifi capability, so I could always ditch the ethernet cable if the best spot for the basestation doesn't permit a cable run. But I'm aware that ethernet usually offers faster transfer speeds than wifi. Moreover, I'm not sure that the Sony BDP supports 5GHz. It might be a 2.4GHz-only device, in which case I'll have new interference issues to contend with, since like I said in my original post, there are several other 2.4GHz networks in my building.
Anyhow, now that I understand the problem, I can figure out a solution. Thanks again.

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Need help in improving the performance for the sql query

Thanks in advance for helping me.
I was trying to improve the performance of the below query. I tried the following methods used merge instead of update, used bulk collect / Forall update, used ordered hint, created a temp table and upadated the target table using the same. The methods which I used did not improve any performance. The data count which is updated in the target table is 2 million records and the target table has 15 million records.
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SQL query:
update targettable tt
set mnop = 'G',
where ( x,y,z ) in
select a.x, a.y,a.z
from table1 a
where (a.x, a.y,a.z) not in (
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987981 wrote:
I was trying to improve the performance of the below query. I tried the following methods used merge instead of update, used bulk collect / Forall update, used ordered hint, created a temp table and upadated the target table using the same. The methods which I used did not improve any performance. And that meant what? Surely if you spend all that time and effort to try various approaches, it should mean something? Failures are as important teachers as successes. You need to learn from failures too. :-)
The data count which is updated in the target table is 2 million records and the target table has 15 million records.Tables have rows btw, not records. Database people tend to get upset when rows are called records, as records exist in files and a database is not a mere collection of records and files.
The failure to find a single faster method with the approaches you tried, points to that you do not know what the actual performance problem is. And without knowing the problem, you still went ahead, guns blazing.
The very first step in dealing with any software engineering problem, is to identify the problem. Seeing the symptoms (slow performance) is still a long way from problem identification.
Part of identifying the performance problem, is understanding the workload. Just what does the code task the database to do?
From your comments, it needs to find 2 million rows from 15 million rows. Change these rows. And then write 2 million rows back to disk.
That is not a small workload. Simple example. Let's say that the 2 million row find is 1ms/row and the 2 million row write is also 1ms/row. This means a 66 minute workload. Due to the number of rows, an increase in time/row either way, will potentially have 2 million fold impact.
So where is the performance problem? Time spend finding the 2 million rows (where other tables need to be read, indexes used, etc)? Time spend writing the 2 million rows (where triggers and indexes need to be fired and maintained)? Both?

Help to improve the performance of a procedure.

Hello everybody,
First to introduce myself. My name is Ivan and I recently started learning SQL and PL/SQL. So don't go hard on me. :)
Now let's jump to the problem. What we have there is a table (big one, but we'll need only a few fields) with some information about calls. It is called table1. There is also another one, absolutely the same structure, which is empty and we have to transfer the records from the first one.
The shorter calls (less than 30 minutes) have segmentID = 'C1'.
The longer calls (more than 30 minutes) are recorded as more than one record (1 for every 30 minutes). The first record (first 30 minutes of the call) has segmentID = 'C21'. It is the first so we have only one of these for every different call. Then we have the next (middle) parts of the call, which have segmentID = 'C22'. We can have more than 1 middle part and again the maximum minutes in each is 30 minutes. Then we have the last part (again max 30 minutes) with segmentID = 'C23'. As with the first one we can have only one last part.
So far, so good. Now we need to insert these call records into the second table. The C1 are easy - one record = one call. But the partial ones we need to combine so they become one whole call. This means that we have to take one of the first parts (C21), find if there is a middle part (C22) with the same calling/called numbers and with 30 minutes difference in date/time, then search again if there is another C22 and so on. And last we have to search for the last part of the call (C23). In the course of these searches we sum the duration of each part so we can have the duration of the whole call at the end. Then we are ready to insert it in the new table as a single record, just with new duration.
But here comes the problem with my code... The table has A LOT of records and this solution, despite the fact that it works (at least in the tests I've made so far), it's REALLY slow.
As I said I'm new to PL/SQL and I know that this solution is really newbish, but I can't find another way of doing this.
So I decided to come here and ask you for some tips on how to improve the performance of this.
I think you are getting confused already, so I'm just going to put some comments in the code.
I know it's not a procedure as it stands now, but it will be once I create a better code. I don't think it matters for now.
DECLARE
CURSOR cur_c21 IS
    select * from table1
    where segmentID = 'C21'
    order by start_date_of_call;     // in start_date_of_call is located the beginning of a specific part of the call. It's date format.
CURSOR cur_c22 IS
    select * from table1
    where segmentID = 'C22'
    order by start_date_of_call;
CURSOR cur_c22_2 IS
    select * from table1
    where segmentID = 'C22'
    order by start_date_of_call;
cursor cur_c23 is
    select * from table1
    where segmentID = 'C23'
    order by start_date_of_call;
v_temp_rec_c22 cur_c22%ROWTYPE;
v_dur table1.duration%TYPE;           // using this for storage of the duration of the call. It's number.
BEGIN
insert into table2
select * from table1 where segmentID = 'C1';     // inserting the calls which are less than 30 minutes long
-- and here starts the mess
FOR rec_c21 IN cur_c21 LOOP        // taking the first part of the call
   v_dur := rec_c21.duration;      // recording it's duration
   FOR rec_c22 IN cur_c22 LOOP     // starting to check if there is a middle part for the call
      IF rec_c22.callingnumber = rec_c21.callingnumber AND rec_c22.callednumber = rec_c21.callednumber AND
        (rec_c22.start_date_of_call - rec_c21.start_date_of_call) = (1/48)
/* if the numbers are the same and the date difference is 30 minutes then we have a middle part and we start searching for the next middle. */
      THEN
         v_dur := v_dur + rec_c22.duration;     // updating the new duration
         v_temp_rec_c22:=rec_c22;               // recording the current record in another variable because I use it for the next check
         FOR rec_c22_2 in cur_c22_2 LOOP
            IF rec_c22_2.callingnumber = v_temp_rec_c22.callingnumber AND rec_c22_2.callednumber = v_temp_rec_c22.callednumber AND
              (rec_c22_2.start_date_of_call - v_temp_rec_c22.start_date_of_call) = (1/48)
/* logic is the same as before but comparing with the last value in v_temp...
And because the data in the cursors is ordered by date in ascending order it's easy to search for another middle parts. */
            THEN
               v_dur:=v_dur + rec_c22_2.duration;
               v_temp_rec_c22:=rec_c22_2;
            END IF;
         END LOOP;
      END IF;
      EXIT WHEN rec_c22.callingnumber = rec_c21.callingnumber AND rec_c22.callednumber = rec_c21.callednumber AND
               (rec_c22.start_date_of_call - rec_c21.start_date_of_call) = (1/48);
/* exiting the loop if we have at least one middle part.
(I couldn't find if there is a way to write this more clean, like exit when (the above if is true) */
   END LOOP;
   FOR rec_c23 IN cur_c23 LOOP
      IF (rec_c23.callingnumber = rec_c21.callingnumber AND rec_c23.callednumber = rec_c21.callednumber AND
         (rec_c23.start_date_of_call - rec_c21.start_date_of_call) = (1/48)) OR v_dur != rec_c21.duration
/* we should always have one last part, so we need this check.
If we don't have the "v_dur != rec_c21.duration" part it will execute the code inside only if we don't have middle parts
(yes we can have these situations in calls longer than 30 and less than 60 minutes). */
      THEN
         v_dur:=v_dur + rec_c23.duration;
         rec_c21.duration:=v_dur;               // updating the duration
         rec_c21.segmentID :='C1';
         INSERT INTO table2 VALUES rec_c21;     // inserting the whole call in table2
      END IF;
      EXIT WHEN (rec_c23.callingnumber = rec_c21.callingnumber AND rec_c23.callednumber = rec_c21.callednumber AND
                (rec_c23.start_date_of_call - rec_c21.start_date_of_call) = (1/48)) OR v_dur != rec_c21.duration;
                // exit the loop when the last part has been found.
   END LOOP;
END LOOP;
END;I'm using Oracle 11g and version 1.5.5 of SQL Developer.
It's my first post here so hope this is the right sub-forum.
I tried to explain everything as deep as possible (sorry if it's too long) and I kinda think that the code got somehow hard to read with all these comments. If you want I can remove them.
I know I'm still missing a lot of knowledge so every help is really appreciated.
Thank you very much in advance!

Atiel wrote:
Thanks for the suggestion but the thing is that segmentID must stay the same for all. The data in this field is just to tell us if this is a record of complete call (C1) or a partial record of a call(C21, C22, C23). So in table2 as every record will be a complete call the segmentID must be C1 for all.Well that's not a problem. You just hard code 'C1' instead of applying the row number as I was doing:
SQL> ed
Wrote file afiedt.buf
1 select 'C1' as segmentid
2        ,start_date_of_call, duration, callingnumber, callednumber
3 from (
4        select distinct
5               min(start_date_of_call) over (partition by callingnumber, callednumber) as start_date_of_call
6              ,sum(duration) over (partition by callingnumber, callednumber) as duration
7              ,callingnumber
8              ,callednumber
9        from table1
10*      )
SQL> /
SEGMENTID START_DATE_OF_CALL     DURATION CALLINGNUMBER   CALLEDNUMBER
C1         11-MAY-2012 12:13:10 8020557824 1982032041      0631432831624
C1         15-MAR-2012 09:07:26 269352960 5581790386      0113496771567
C1         31-JUL-2012 23:20:23 134676480 4799842978      0813391427349
Another thing is that, as I said above, the actual table has 120 fields. Do I have to list them all manually if I use something similar?If that's what you need, then yes you would have to list them. You only get data if you tell it you want it. ;)
Of course if you are taking the start_date_of_call, callingnumber and callednumber as the 'key' to the record, then you could join the results of the above back to the original table1 and pull out the rest of the columns that way...
SQL> select * from table1;
SEGMENTID START_DATE_OF_CALL     DURATION CALLINGNUMBER   CALLEDNUMBER          COL1       COL2       COL3
C1         31-JUL-2012 23:20:23 134676480 4799842978      0813391427349          556         40       5.32
C21        15-MAR-2012 09:07:26 134676480 5581790386      0113496771567          219        100      10.16
C23        11-MAY-2012 09:37:26 134676480 5581790386      0113496771567          321         73       2.71
C21        11-MAY-2012 12:13:10 3892379648 1982032041      0631432831624          959         80       2.87
C22        11-MAY-2012 12:43:10 3892379648 1982032041      0631432831624          375         57       8.91
C22        11-MAY-2012 13:13:10 117899264 1982032041      0631432831624          778         27       1.42
C23        11-MAY-2012 13:43:10 117899264 1982032041      0631432831624          308         97       3.26
7 rows selected.
SQL> ed
Wrote file afiedt.buf
1 with t2 as (
2 select 'C1' as segmentid
3        ,start_date_of_call, duration, callingnumber, callednumber
4 from (
5        select distinct
6               min(start_date_of_call) over (partition by callingnumber, callednumber) as start_date_of_call
7              ,sum(duration) over (partition by callingnumber, callednumber) as duration
8              ,callingnumber
9              ,callednumber
10        from table1
11       )
12 )
13 --
14 select t2.segmentid, t2.start_date_of_call, t2.duration, t2.callingnumber, t2.callednumber
15        ,t1.col1, t1.col2, t1.col3
16 from   t2
17         join table1 t1 on (   t1.start_date_of_call = t2.start_date_of_call
18                           and t1.callingnumber = t2.callingnumber
19                           and t1.callednumber = t2.callednumber
20*                          )
SQL> /
SEGMENTID START_DATE_OF_CALL     DURATION CALLINGNUMBER   CALLEDNUMBER          COL1       COL2       COL3
C1         11-MAY-2012 12:13:10 8020557824 1982032041      0631432831624          959         80       2.87
C1         15-MAR-2012 09:07:26 269352960 5581790386      0113496771567          219        100      10.16
C1         31-JUL-2012 23:20:23 134676480 4799842978      0813391427349          556         40       5.32
SQL>Of course this is pulling back the additional columns for the record that matches the start_date_of_call for that calling/called number pair, so if the values differed from row to row within the calling/called number pair you may need to aggregate those (take the minimum/maximum etc. as required) as part of the first query. If the values are known to be the same across all records in the group then you can just pick them up from the join to the original table as I coded in the above example (only in my example the data was different across all rows).

Looking for help on what Hardware to use for FCS

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I have 4 edit stations that currently run externals. I am looking at a solution like FCS to centralize all the captures and media to edit from. We usually edit Apple Pro res and DV footage.
My understanding is that we need to connect to the storage using Fibre to get the bandwidth needed. My issue is wondering exactly how much hardware I need to get this done and what the layout of this hardware should be.
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Steve Price wrote:
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That's pretty good, assuming you have the numbers right. You need Xsan software and a Fibre Channel card for every computer connecting via FC (the Xserves and Mac Pros). Note that the 20 port switch has 16 usable ports, and each storage or computing device should connect to two ports, so you've basically filled it up with what you've listed.
I also have an XServe that is on the (10 GB ethernet) network (in another building on campus) that is currently being used as a login/account manager (could it be used for metadata as well?).
It would be good to use this as the failover MDC to support the one you are purchasing. Can you relocate it so it is physically closer? It should be Intel. It is not recommended to have the primary MDC perform directory or other services, but some people do this (at a slight risk) on a secondary server.
Will I need to reduce one of the Mac Pro editors to merely a metadata controller (leaving me with 4 editors)?
Not recommended, except maybe as a backup.
Can I use the existing network for the LAN and METADATA Switches?
You'll need a separate network for metadata traffic. This can be physical or virtual (on higher-end switches).
@trezero-your list is the first I've seen with 3 XServes. Is this just because of FCServer? Can you not use the MDC or one of the networked editors?
FCServer warrants its own machine since it is fairly CPU intensive, especially if you are doing transcoding on it. In high performance environments people will add a second machine just to do rendering.
Don't put any other server process on the MDC. You could use the backup MDC for FCSvr, but this isn't recommended since if it gets failed over to, then it is no longer the backup, and you're again risking your Xsan integrity on a shared system. In an educational lab setup where the risk of downtime is not an inconvenience, you could probably get away with it.
You would probably benefit from either taking the Xsan class or working with a professional systems integrator. I'm based in the Southeast and can refer you to a few people if you contact me offline.

New Mac user looking for help with Finder, Preview, Keyboard, & Dock

So about a month ago I switched over from a lifelong Windows user to a brand new MacBook Pro, and while I am adjusting pretty well, there are still some things that I haven't quite figured out.
First up on the list is Finder! I like my files to be arranged just like how they are in Windows Explorer--folders first alphabetically, then files alphabetically. I've managed to acquire this setting by messing around with the "clean up by" and "arrange by" functions but I don't really know the specific combination. Most of the time these preferences are saved and set as the defaults under "View Options" but every once in a while it resets and I have to tinker around with the settings all over again. Does anyone know of a way to fix this? It's only happened twice so far, but I'd rather not have it happen again. Also, occasionally when I delete an item, there is a blank space left where the icon was instead of all the files following it bumping up a space. Any quick fixes for this bug?
Next up is Preview. Again, I like the Windows Way and I like to be able to browse between the files in a folder while using Preview/Windows Photo Viewer. I know that there is a way to browse between files if you select the whole folder and stick it in Preview, but is there a way to achieve the same result without having to do that? An app or "extension" of some sort that adds arrows in to browse between photos? I've had no luck finding anything other than the aforementioned option. Is there a good free alternative to Preview that will function similarly with the browse between photos option?
One of my favorite things about my new Mac is the backlit keyboard function. My old laptop didn't have it and as someone who is online more often at night it is super helpful. But is there a way to turn it off during the day/in bright settings? A way to put it on a timer? In System Preferences I selected the option "Adjust keyboard brightness in low light", which I assumed to mean would have the keyboard NOT very bright when there IS light, but it continues to light up just the same. Any apps or extensions to help with this one?
And finally, the dock! This question is more about aesthetics than functionality but help is appreciated all the same. Currently, my dock looks like this: http://i42.tinypic.com/35ktxlz.png It is rather opaque and the indicator lights can barely be seen. However, in a lot of tutorial videos I've been watching, many people have docks that look like this: http://i.i.cbsi.com/cnwk.1d/i/tim/2011/07/19/Lion_LaunchPad.png It is a darker shade of gray, the divider is dashed rather than a straight line, and the indicator lights are clearly visible. Does anybody know how to get this look for the dock? I've looked in the dock preferences but there's not really anything in there other than magnification/size/effects.
That about sums things up! I'm sorry if any of these seem like "silly" questions but they are all things I have been unable to find answers for. Any and all tips, tricks, and help is appreciated! Thanks in advance for all your help!!

congratulations on coming over from the dark side.
Seems like you are interested in column view, which would show you the hierarchy of folders and files: Column View in Mac OS X Mountain Lion - For Dummies Not sure what's going on if your finder settings don't stay put. May be a corrupted preferences file, which is easy to fix, but is perhaps a topic for another discussion.
What I'd suggest is to have an open mind and try to see what the mac can do, rather than force it to look like your windows machine. I mean, if you just want it to look like windows, then why bother switching? If you give it a little time, you'll start to appreciate the mac way of doing things, and see how it is infinitely more awesome, powerful, creative, intuitive, and better designed (and the software way better written) than what you left behind. But that's your call.
There are some threads on this forum with complaints about the backlight. Keyboard backlight settings query...: Apple Support Communities Evidently it depends on the angle of the screen and the light sensor relative to the light. Some suggest that a SMC reset may help: Intel-based Macs: Resetting the System Management Controller (SMC) This is not an issue for me, I just adjust the brightness with the keyboard buttons if I want. Real men shift their own gears, drink their coffee black, and adjust their own keyboard brightness. I am not aware of any software to exert more control over this feature but a search of macupdate Download Apple Mac Software & iPhone Software : MacUpdate may help. I mean, it's up to you what is important. I can waste a lot of time playing around with the GUI and with unnecessary software, or I can just get my work (and play) done.
You might prefer the no-glass dock, that removes the shelf, and makes the indicator lights like more discrete orbs. You can do this with the terminal. Using the terminal is also, perhaps, a topic for another discussion.I like the 2D dock much better. If you want I'll give you some directions for how to do it. Otherwise, here's a reference: 2D Dock - MacRumors Forums

Help to improve expdp performance and compression

Hi,
We have a oracle standard Edition which do not support parallel , compression features of expdp.
The expdp dmp file is around 90GB and it takes 45 minutes to create in production server . Then the scripts compresses the file with gzip utility and compression takes 80 minutes.
To copy the compressed file from prod to staging server it takes another 47 minutes .
We have automated the process but it takes long time for expdp + compression + copy ( Around 3 hrs ) . On staging server it does take more than 4 hours to create the staging db.
Is there anyway I can improve the performance of these 3 operations .
Can I do compression while file is exporting ? I tried using pipes in unix and it doesn't work for expdp.
We don't want to use network link .
Will expdp commands writes the file sequentially ? If so , can I start gzipping parallely when files are exported .
Also tried compressing with gzip -1 option , but it has increased the file size by 30% , and eventually increased the copy time to staging server .
Please help
Thanks,
Bharani J
Edited by: 973089 on Nov 27, 2012 9:40 AM
Edited by: 973089 on Nov 27, 2012 9:41 AM

Hi,
Why 'do not support parallel' ?
I understand you don't want to use database link, i had this problem here [i used expdp].
This is what i've done:
A script that do:
A full logic backup using expdp,
a bzip2 to compact,
and a transfer to the machine of destiny.
It would be far more easily if i could use the database link, but i couldn't.
however i used the parallel in expdp command.
Hope you find a good solution.

Looking For Help for porting PC utility to Mac

Hi,
I am looking for local Mac developer(s)who could help me to port my MXF utility (HDV M2T=>QT conversion) to Mac OS X. I need someone who is around SF Bay Area. It's a simple program however requires knowlegde of threads. (I use worker thread. simple one) Please contact me at [email protected] if you are interested.
<Edited by Moderator>

Why was this merely "edited by moderator"? It should be removed or moved to the appropriate forum. Wait, there is no "solicitation" forum.
bogiesan

Looking for help to improve Airport performance over LAN (WAN is fine)

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