DSL Speed Issue

I am at my wits end on this. ADSL modem status page states the download connection is coming in at just over 4000kbps (4 megs). However, a test run from DSL reports shows my PC receving only ~1400 kbps.
I have tweaked Dr. TCP/IP and all seems to be correct.

Network is as follows:
Netgear DG632 ADSL modem (routing function is disabled) to Linksys WRT54g router Netgear Gigabit switch to Dell 8300 with a D-Link 530T gigabit lan card. (All wired connection). This machine is part of a domain running 2003 SP1.

What have I overlooked? Thanks in advance.

Is that even possible 4megs/second on dsl? According to what i've learned here isnt the theoretical max speed of dsl 1meg a second which equates to to 8000kb/s. Another thing to note DSL speed is based on your distance from the CO.

Okay...it's 4000 kbps or 4mbps. The modem is seeing the speed, but not the PC. I'm 5 blocks from the node so distance is not an issue.

I get very different results from the BBR speedtests depending upon which datacenter I test against. It will go from over 5Mbps to under 2Mbps when testing against Los Angeles versus San Francisco, and it varies almost as much when testing against different Los Angeles datacenters.

Have you tested the speed when the modem is connected directly to the computer? Some modem/router combinations are problematic.

I presume you've already tested the LAN speed and it's humming right along as expected? (With gigabit, perhaps "whistling" would be a better description... :D )

That's the only thing I have not done, just because the Army is working my tail off right now with a network accreditation package, but it is the next thing on my list to check.
The only other thing I can try is to go back and use the Intel Pro VE 10/100 on board adapter to cross refernce the connection. So the check will be first:

Try my laptop directly out of the modem to check the speed, if that fails, then I know its the ISP. If the laptop connects at anything over 3mbps, then I will try the Intel adapter (disabling the D-Link) and check speed. If I do not see the same speed as the laptop, I will connect both adapters directly from the modem and check.
If the speed is still high, then I know it is a bottle neck between the modem and the gig switch that the domain connects thru.

You mentioned in your first post that you had already tried "tweaking" your settings, but were those the settings in the computer or the modem? My thought being that the modem's response about a 4Mbps connection might be what it's sensing (or being told) from the head end, but during actual transfer tests it's choking itself due to an improper MTU size in the modem.

Could very well be. The CPU has been tweaked but not the modem and it could be an improper configuation with Telecom Italia. The Netgear DG632 is at default settings (except for having the router disabled) and there is some remark in there about matching a setting from the ISP.
I am set for PPPOA and the modem is capable of both USB and ethernet connections (I use ethernet).
I have searched the Telecom site for specific settings but can not find it listed (surprise..surpise..what a lame excuse for an ISP).
Let me get back home tonight and I post back the setting you can tweak on the modem. Other than that, it's test a modem time if the other tests do not work. We have now have other modems available here on the market. TI did not want to supply anything but USB modems to cut down on home users networking but I guess people raised a big stink about that so I had this modem shipped in from the states. D-Link makes one that is pretty straight forward so we may be looking at that one.
I'll never say another bad word about any US ISP anymore...I promise.

You could always try figuring out the best MTU using BBR's manual instructions.

And there's also the router's settings to consider, if it's the one responsible for establishing the PPPoA connection (some ADSL modems, like the Speedstream 5100b, can now be set to handle this before the router even gets involved).

Okay the settinsg I was referring to are the:
Multiplexing Method where I can choose either LLC(default) or VC and there is a value for VPI and VCI set to 8 & 35 respectively.
The Linksys router is fully capable of hanld ethat much bandwidth.

No idea. I'm only used to PPPo<b>E</b>, and it doesn't having settings like that. I had presumed that PPPoA would look the same...silly me. :o

I'm going to try a direct connection to the modem and see what I get. I did notice at lunch the speed down to 2012 kbps from over 4000 the other day but still thr thruput is no better.
So how's things at CalState?

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So how's things at CalState?

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Quiet. I think the fall semester hasn't started yet. If you know the area, I'm north on Associated, across the street from Craig Park.

When you say the speed is down in the 2Mbps range, is that from the modem status page or a speedtest result?

That speed was from the modem status page.
Vaguely familiar with the vicinity, my son lives in Yorba Linda. He transger from IVCC in the Spring.

Well he certainly improved his commute. :D

Okay I'm beginning to suspect a fulaty or inaccuratelt setup modem. The status page read in excess of 4500 kbps coming downstream and DSL reports only showed about 1100 kbps for speed.
This was with a latop connected directly to the modem and bypassing all the internal LAN.
I have another modem (D-LINK DSL-300T) and I think the only reason I didn't put it online before it it has the same web inertface address as the Linksys router, so something will have to change.
The D-Link modem goes on line in the modem independtly of the netwrok to see what speeds I can get.
Thanks for the help.

Sounds like you may be well on the way to fixing this ... but an added note. Be sure you have the firmware updated for your hardware involved.

There's only one version of it out and it is current so I am thinking the D-Link modem goes on line today to test speed between the two.
If that is successful, this will be one interesting network.
D-Link Modem to Linksys Router to Netgear Switch. Who says I don't spread the wealth around. :)

Just a little update; I have used combination of routers, modems, and machines without and with the routers and nothing gets me any higher speed than about 1.4 mbps when the modems read speeds from 3.2mbps to 4.6 mbps.
I am totally out of ideas and am beginning to believe this is a DSL line quality issue.
The only left to try is at another location where I know they also have 4.0mbps downstream service.

Interesting thread, 2 weeks ago I was recieving 589kbps..... now it's 3.7mbps, I'm not complaining, but why?

I read where some ISP in England was going after a 20 mbps speed. I'd kill just to get my 4 out of Telecom Italia.

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I read where some ISP in England was going after a 20 mbps speed

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Yep, Bulldog, owned by Cable and Wireless are going to be offering 20mbps so that users can pay to download movies, and my ISP NTL is following suit with 10mb firstly next year, and then to infinity and beyond.


Liam

For the way I use my connection, I'd rather have symetrical speeds even if it were no more than 2Mbps.