Internet 2 times slower, but transfer speed ok

Hi!
Have a time capsule 1st gen connected to wimax modem via ethernet, bridge mode.
When connecting to modem i have a 8 mbps speed, to time capsule - just about 4.
The weirdness is that the transfer rate between pc and capsule is about 130 mbps, so the signal is ok.
Assuming that there is no problem on the modem side (direct connection works well), what can be wrong? I tried to play with the settings on TС and sometimes it gave me about 0,5 mbps when the inner network speed was ok.
Where to look? What do i have to change?

Don't know what's causing it, but a few things to check are:
-- Do you have to run the TC in Bridge mode for your setup?
-- Make sure you're using WPA2 Personal password protection/encryption.
-- What mode network is the TC set up for, and what modes are your PC capable of receiving. Generally, you will choose between 802.11 a, b, g, or n, or some combination of those. For most modern stuff you're going to want to use n.
-- Newer base stations support 2.4 Gz and 5 GHz bands. 5 GHz is faster, but has more limited range (meaning, it could actually be slower if it's far away) and less ability to penetrate obstacles such as walls. This is something you need to experiment with. Not sure if your Gen 1 supports 5 GHz.
-- You might be getting interference. Microwave ovens are notorious for this, but it can come from other sources, including cordless phones, wireless speakers, Bluetooth, DSS satellite receiver dishes, baby monitors, and other Wifi networks in the area. Try setting your TC to a specific channel instead of Automatic, and try a few different channels. There also used to be a checkbox called something like "Use interface robustness"...I think they might have changed the wording and offhand I can't remember what they call it now, but basically it can try using a few tricks to get around external interference (as I recall it uses smaller data packet sizes). Note that if you're not having problems, you want this OFF, as it will reduce speeds. But, if you are experiencing interference, it can help a lot.
-- Make sure your TC is set to transmit a full power signal (it can be reduced, normally you don't want to).
Just a few things to take a look at.

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Thanks for the reply zvxy.
I'm running the most current from [core], version 2.6.37.5-1.
Disabling the N mode improved transfer rates for CIFS/SMB shares. They are the same as with NFS now which is around 2.5 MB/s. Transfer speed for NFS stayed the same.
I'll try the kernel from [testing] and report back later.
// I've tested 2.6.38.2-1 a little bit now and as long as i don't disable wireless N i get transfer rates of up to 12 MB/s with NFS4. That's more than enough for me and i hope it stays that way. The downside is that transfer rate for CIFS is only 1 MB/s.
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Guess I'll just have to stick with NFS (not that i don't mind but it's already thrown me some "stale" error messages with the new kernel ... i can't seem to catch a break ).
I'll consider this issue solved. Thanks!
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