NAT issue pertaining to speed

[cornelius81]

My specs:

CTC Union modem/router (model ATU-R210)
Airport Base Station
Macbook Intel with 10.4.1
Costa Rican ISP (ICE)
Software: Transmission (however not other software works any better)

I have been reading up on how to open my ports to speed up my download/uploads and it seems to always come back to having NAT enabled on my modem. The main problem with this is whenever I enable NAT my connection speed slows to a snails space.

The configuration for the modem that my ISP set up (you can only use one of their approved modems and they will not provide them) disables DCHP and I think gives me a static IP address. The setup doesn't work at it's default settings but have to be manually configured. (I have all of this info if it would help.)

Is there a reason that NAT is slowing me down so much? Any thoughts on curing this issue?

My bandwith is 846.1 kbps, but the download speeds I'm getting is about 18Kb/s.

All help is greatly appreciated. And please bear with me as I'm still getting confused even after trying to school myself on these issues for over a week.

[Krell]

Network Address Translation = gives you a new subnet, 192.168.1.XXX

This is now your internal IP address, and your router can provide you with some firewall capabilities. You CAN have a static internal IP address on most routers, but this will depend on your particular model #.

Any time you set up NAT, you will need to Port Forward the proper ports for your applications.

1) know the app your using and which ports to forward - http://portforward.com/

2) read the manual for the ATU-R210 - http://www.ctcu.com.tw/download/atur210_man.pdf

http://www.ctcu.com.tw/component/option,com_productbook/func,detail/Itemid,37/id,64/


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[cornelius81]

Krell,

Thanks for the info. I've been to portforward.com plenty (unfortunately they don't have my modem or its interface listed) and I've read the manual.

But I can't enable NAT if it's going to slow my overall use down as much as it has. Is there a reason that I'm getting slowed down when I enable NAT?

[Krell]

Yes, because you need some way to connect the dots in the NAT.

External IP and routing <-------> Internal IP and routing.

Unless you properly forward ports, the packet faeries cant jump the great devide.

No port forward means no request forward, and no downloady.

Read pages 34 - 39 again. If that doesnt click, find some kid at the mall and pay him $10.

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[cornelius81]

Just to make sure I'm understanding, and because I'm an idiot on this issue.

This isn't a matter of just slow dwnld speeds, but taking 45 seconds to open an email in gmail. Does this seem normal?

[Krell]

Call your isp and ask them for some assistance. If this is what they provide you, they support it, call them every day from now on.

This is not normal behavior, but again it may be due to something not discussed in this thread, such as an OS firewall, which filters certain types of traffic, or incorrect settings affecting the dns on the router.

It could also be due to you trying to use P2P while you surf the internet with the improperly configured settings.

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[cornelius81]

My ISP won't talk to me because they're a monopoly. So my choices are nill and the idea of service goes straight out the window.

I've had the OS firewall off while trying all of this.

It's possible I could have some settings in the modem slightly off, but since it seems to be a rare modem with minimal information online coupled with the ISP issue, I haven't been able to check it.

[cornelius81]

I'm going to post my configuration setup in separate posts.

http://img2.freeimagehosting.net/uploads/656b7bff59.png (http://www.freeimagehosting.net/)

[cornelius81]

http://img2.freeimagehosting.net/uploads/7da9a59496.png (http://www.freeimagehosting.net/)

[cornelius81]

http://img2.freeimagehosting.net/uploads/7c747661ab.png (http://www.freeimagehosting.net/)

[cornelius81]

http://img2.freeimagehosting.net/uploads/a78e10afb3.png (http://www.freeimagehosting.net/)

[cornelius81]

http://img2.freeimagehosting.net/uploads/22e8df6ef8.png (http://www.freeimagehosting.net/)

[cornelius81]

http://img2.freeimagehosting.net/uploads/70f6e2d85b.png (http://www.freeimagehosting.net/)

[cornelius81]

http://img2.freeimagehosting.net/uploads/3a45f09785.png (http://www.freeimagehosting.net/)

[cornelius81]

http://img2.freeimagehosting.net/uploads/da13dee014.png (http://www.freeimagehosting.net/)

[Krell]

Well, you beat me to my next post!

But you are already pasting what I was going to use as an illustration.

Let me cut you off first . . just stop right there.

Thers no way for me to GUESSTIMATE on these settings. Only your ISP can tell you if you are PPOE or not, and this makes a huge freaking difference.
Trust me, I've called ISPs internationally at midnight my time USA, to yell at them in English for fucking up projects and wasting my time and $.

Find someone there that knows wtf they are talking about, and dont take no for an answer. PPOE uses an MTU of 1492. This gives a little extra room to get a "receipt" back for sending packets. If your set for a 1500 MTU, you are over conjested.

Please, just take this info to your ISP and go over it line item at a time.

Also, you can use the DHCP setting there, this is for your INTERNAL lan, not theirs.

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[cornelius81]

I'll see what I can do, but in Costa Rica service is a four-letter word. This all started when I fucked up my configuration last week. I called the guy who installed it and he said he would come by later. I called him the next day and he said he would come later. I called the following day and offered money and he said it's not even his job and finally admitted he would never come over. I called the ISP direct to have them walk me through the configuration on the phone and they said they wouldn't and I could expect a service guy to show up and fix it in two to three weeks, but here weeks = months.

I finally was able to check out my neighbors configuration and substitute my IP addresses for his and get back online.

I'm pretty certain that I'm no PPoE because I have no username or password and that's what this interface asks for when setting up PPoE.

[Krell]

Finding a known good, thats what 1\2 of all investigation is about.

Is there any type of internet cafe near you? Anyone else that uses the ISP?

If this thread were to go long enough, you might solve it all yourself the day before the service guy shows up.

At least you have screen shots to keep track of, and unlimited ability to make folders to put them in.


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[cornelius81]

Part of the problem is that even 'experts' down here are unreliable. Clearly everyone with service is on the same ISP due to the whole monopoly thing.

I just switched NAT on again with the modem connected directly to the cpu and it slowed down to the point of not being able to even refresh this page.

I have a better understanding of port forwarding than I did when I started, but I don't have a clue why enabling NAT just kills my connection.

On second inspection it might have worked and the slowing was because I had a file being downloaded. I just noticed that file seriously jumped in how much it had downloaded, but I'm not sure if it was due to error or not, I obviously didn't check at the time. I guess I will now.

[EDIT] Okay, nothing solved at all. Watching the software after enabling NAT only showed that the downloads stop completely. Is the opinion that I must have some other setting incorrect for this to be the case? My neighbor has his NAT and Firewire enabled and he's all good. The only difference between the two of us is our IP's and he is signed up for 1/2 the connection speed that I am. Part of this could be a Mac OS issue that I don't really understand and no pc people here would get. Is that possible with the slow down?

[Boomer The Dog]

What I don't get is why the LAN address, the local network is on 201.203.168.165 in your picture, shouldn't it be something like 192.168.1.1, subnet mask 255.255.255.0, with DHCP enabled? I know that you can give yourself just about any internal (LAN) address space, but that's not a normal thing to do.

[Krell]

If he sets the lan address to the same IP and subnet mask as the IP his ISp assigns . . . whew, not good.


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[cornelius81]

What I don't get is why the LAN address, the local network is on 201.203.168.165 in your picture, shouldn't it be something like 192.168.1.1, subnet mask 255.255.255.0, with DHCP enabled? I know that you can give yourself just about any internal (LAN) address space, but that's not a normal thing to do.

I can't give the logic behind it, but as great as this country is they seem to have a history of doing things as screwed up as possible. They made sure to disable DHCP when they came by to set everything up.